485BPOS

As filed with the Securities and Exchange Commission on December 19, 2012

1933 Act File No. 033-00572

1940 Act File No. 811-04409

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM N-1A
	REGISTRATION STATEMENT UNDER THE SECURITIES ACT of 1933	o
	POST-EFFECTIVE AMENDMENT NO. 140	x
	REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	o
	AMENDMENT NO. 142	x
Eaton Vance Municipals Trust
(Exact Name of Registrant as Specified in Charter)
Two International Place, Boston, Massachusetts 02110
(Address of Principal Executive Offices)
(617) 482-8260
(Registrant’s Telephone Number)
MAUREEN A. GEMMA
Two International Place, Boston, Massachusetts 02110
(Name and Address of Agent for Service)

 

It is proposed that this filing will become effective pursuant to Rule 485 (check appropriate box):
x	immediately upon filing pursuant to paragraph (b)	o	on (date) pursuant to paragraph (a)(1)
o	on (date) pursuant to paragraph (b)	o	75 days after filing pursuant to paragraph (a)(2)
o	60 days after filing pursuant to paragraph (a)(1)	o	on (date) pursuant to paragraph (a)(2)
If appropriate, check the following box:
o	This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Amendment to the Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Amendment to its Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized in the City of Boston, and the Commonwealth of Massachusetts, on December 19, 2012.

Eaton Vance Municipals Trust

By:  /s/ Thomas M. Metzold

Thomas M. Metzold, President

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated on December 19, 2012.

Signature			Title
/s/ Thomas M. Metzold			President (Chief Executive Officer)
Thomas M. Metzold
/s/ Barbara E. Campbell			Treasurer (Principal Financial and Accounting Officer)
Barbara E. Campbell
Signature		Title		Signature	Title
Scott E. Eston*		Trustee		Ronald A. Pearlman*	Trustee
Scott E. Eston				Ronald A. Pearlman
Benjamin C. Esty*		Trustee		Helen Frame Peters*	Trustee
Benjamin C. Esty				Helen Frame Peters
Thomas E. Faust Jr.*		Trustee		Lynn A. Stout*	Trustee
Thomas E. Faust Jr.				Lynn A. Stout
Allen R. Freedman*		Trustee		Harriett Tee Taggart*	Trustee
Allen R. Freedman				Harriett Tee Taggart
William H. Park*		Trustee		Ralph F. Verni*	Trustee
William H. Park				Ralph F. Verni
*By:	/s/ Maureen A. Gemma
	Maureen A. Gemma (As attorney-in-fact)

* Pursuant to a Power of Attorney dated August 6, 2012 filed as Exhibit (q) to the Registrant’s Post-Effective Amendment No. 140 filed November 28, 2012 (Accession No. 0000940394-12-001150) and incorporated herein by reference.

EXHIBIT INDEX

Exhibit No.	Description
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
Ex-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

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Eaton Vance Connecticut Municipal Income Fund

Investment Objective

The Fund’s investment objective is to provide current income exempt from regular federal income tax and Connecticut state personal income tax.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance Connecticut Municipal Income Fund	Class A	Class B	Class C	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	5.00%	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance Connecticut Municipal Income Fund	Class A	Class B	Class C	Class I
Management Fees	0.37%	0.37%	0.37%	0.37%
Distribution and Service (12b-1) Fees	0.20%	0.95%	0.95%	none
Interest Expense	0.05%	0.05%	0.05%	0.05%
Other Expenses other than Interest Expense	0.18%	0.18%	0.18%	0.17%
Other Expenses	0.23%	0.23%	0.23%	0.22%
Total Annual Fund Operating Expenses	0.80%	1.55%	1.55%	0.59%

Example.  

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance Connecticut Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	553	718	898	1,418
Class B	658	890	1,045	1,643
Class C	258	490	845	1,845
Class I	60	189	329	738

Expense Example, No Redemption Eaton Vance Connecticut Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	553	718	898	1,418
Class B	158	490	845	1,643
Class C	158	490	845	1,845
Class I	60	189	329	738

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 13 % of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more.  The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.  Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was 8. 56 % for the quarter ended September 30, 2009, and the lowest quarterly return was –5. 52 % for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 6.35%.  For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 39.36%) for Class A shares were 2.23 % and 3.68 %, respectively, for Class B shares were 1.61 % and 2.66 %, respectively, for Class C shares were 1.61 % and 2.66 %, respectively, and for Class I shares were 2.54 % and 4.19 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Average Annual Total Returns Eaton Vance Connecticut Municipal Income Fund	1 Year	5 Years	10 Years
Class A	5.40%	2.69%	3.80%
Class A After Taxes on Distributions	5.39%	2.69%	3.79%
Class A After Taxes on Distributions and Sales	5.00%	2.88%	3.85%
Class B	4.77%	2.60%	3.54%
Class C	8.77%	2.94%	3.54%
Class I	10.78%	3.86%	4.39%
Barclays Capital Municipal Bond Index	10.70%	5.22%	5.37%
Barclays Capital 20 Year Municipal Bond Index	13.98%	5.27%	6.01%

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to February 9, 2006 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes. If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

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Eaton Vance Pennsylvania Municipal Income Fund

Investment Objective

The Fund’s investment objective is to provide current income exempt from regular federal income tax and Pennsylvania state and local taxes in the form of an investment exempt from Pennsylvania personal property taxes.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance Pennsylvania Municipal Income Fund	Class A	Class B	Class C	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	5.00%	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance Pennsylvania Municipal Income Fund	Class A	Class B	Class C	Class I
Management Fees	0.41%	0.41%	0.41%	0.41%
Distribution and Service (12b-1) Fees	0.20%	0.95%	0.95%	none
Interest Expense	0.05%	0.05%	0.05%	0.05%
Other Expenses other than Interest Expense	0.16%	0.16%	0.16%	0.16%
Other Expenses	0.21%	0.21%	0.21%	0.21%
Total Annual Fund Operating Expenses	0.82%	1.57%	1.57%	0.62%

Example.  

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance Pennsylvania Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	555	724	908	1,440
Class B	660	896	1,055	1,666
Class C	260	496	855	1,867
Class I	63	199	346	774

Expense Example, No Redemption Eaton Vance Pennsylvania Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	555	724	908	1,440
Class B	160	496	855	1,666
Class C	160	496	855	1,867
Class I	63	199	346	774

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 6% of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more. The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.   The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“junk bonds”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.   In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person .  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy .

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was 12.61 % for the quarter ended March 31, 2009, and the lowest quarterly return was –12. 61 % for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 7.50 %.   For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 37.00%) for Class A shares were 2.62 % and 4.16 %, respectively, for Class B shares were 2.01 % and 3.19 %, respectively, for Class C shares were 2.01 % and 3.19%, respectively, and for Class I shares were 2.95 % and 4.68 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Average Annual Total Returns Eaton Vance Pennsylvania Municipal Income Fund	1 Year	5 Years	10 Years
Class A	3.08%	0.91%	3.44%
Class A After Taxes on Distributions	3.08%	0.90%	3.43%
Class A After Taxes on Distributions and Sales	3.67%	1.41%	3.62%
Class B	2.46%	0.81%	3.19%
Class C	6.34%	1.13%	3.17%
Class I	8.34%	2.11%	4.05%
Barclays Capital Municipal Bond Index	10.70%	5.22%	5.37%
Barclays Capital 20 Year Municipal Bond Index	13.98%	5.27%	6.01%

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to January 12, 2006 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

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Eaton Vance Arizona Municipal Income Fund

Investment Objective

The Fund’s investment objective is to provide current income exempt from regular federal income tax and Arizona state personal income tax.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance Arizona Municipal Income Fund	Class A	Class B	Class C	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	5.00%	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance Arizona Municipal Income Fund	Class A	Class B	Class C	Class I
Management Fees	0.33%	0.33%	0.33%	0.33%
Distribution and Service (12b-1) Fees	0.20%	0.95%	0.95%	none
Interest Expense	0.02%	0.02%	0.02%	0.02%
Other Expenses other than Interest Expense	0.21%	0.21%	0.21%	0.21%
Other Expenses	0.23%	0.23%	0.23%	0.23%
Total Annual Fund Operating Expenses	0.76%	1.51%	1.51%	0.56%

Example.

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance Arizona Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	549	706	877	1,372
Class B	654	877	1,024	1,599
Class C	254	477	824	1,802
Class I	57	179	313	701

Expense Example, No Redemption Eaton Vance Arizona Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	549	706	877	1,372
Class B	154	477	824	1,599
Class C	154	477	824	1,802
Class I	57	179	313	701

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 8 % of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions , if securities are rated differently by the rating agencies , the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more.  The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.   In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.  

During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was 9. 41 % for the quarter ended September 30, 2009, and the lowest quarterly return was –7. 54 % for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 7.32 %.  For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 37.95%) for Class A shares were 2.36 % and 3.80 %, respectively, for Class B shares were 1.74 % and 2.80 %, respectively, for Class C shares were 1.74 % and 2.80 %, respectively , and for Class I shares were 2.68 % and 4.32 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Average Annual Total Returns Eaton Vance Arizona Municipal Income Fund	1 Year	5 Years	10 Years
Class A	6.39%	2.91%	4.41%
Class A After Taxes on Distributions	6.35%	2.90%	4.40%
Class A After Taxes on Distributions and Sales	5.66%	3.07%	4.41%
Class B	5.78%	2.79%	4.14%
Class C	9.88%	3.15%	4.14%
Class I	11.82%	3.94%	4.93%
Barclays Capital Municipal Bond Index	10.70%	5.22%	5.37%
Barclays Capital 20 Year Municipal Bond Index	13.98%	5.27%	6.01%

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to December 16, 2005 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Eaton Vance Connecticut Municipal Income Fund

Investment Objective

The Fund’s investment objective is to provide current income exempt from regular federal income tax and Connecticut state personal income tax.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance Connecticut Municipal Income Fund	Class A	Class B	Class C	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	5.00%	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance Connecticut Municipal Income Fund	Class A	Class B	Class C	Class I
Management Fees	0.37%	0.37%	0.37%	0.37%
Distribution and Service (12b-1) Fees	0.20%	0.95%	0.95%	none
Interest Expense	0.05%	0.05%	0.05%	0.05%
Other Expenses other than Interest Expense	0.18%	0.18%	0.18%	0.17%
Other Expenses	0.23%	0.23%	0.23%	0.22%
Total Annual Fund Operating Expenses	0.80%	1.55%	1.55%	0.59%

Example.  

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance Connecticut Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	553	718	898	1,418
Class B	658	890	1,045	1,643
Class C	258	490	845	1,845
Class I	60	189	329	738

Expense Example, No Redemption Eaton Vance Connecticut Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	553	718	898	1,418
Class B	158	490	845	1,643
Class C	158	490	845	1,845
Class I	60	189	329	738

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 13 % of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more.  The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.  Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was 8. 56 % for the quarter ended September 30, 2009, and the lowest quarterly return was –5. 52 % for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 6.35%.  For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 39.36%) for Class A shares were 2.23 % and 3.68 %, respectively, for Class B shares were 1.61 % and 2.66 %, respectively, for Class C shares were 1.61 % and 2.66 %, respectively, and for Class I shares were 2.54 % and 4.19 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Average Annual Total Returns Eaton Vance Connecticut Municipal Income Fund	1 Year	5 Years	10 Years
Class A	5.40%	2.69%	3.80%
Class A After Taxes on Distributions	5.39%	2.69%	3.79%
Class A After Taxes on Distributions and Sales	5.00%	2.88%	3.85%
Class B	4.77%	2.60%	3.54%
Class C	8.77%	2.94%	3.54%
Class I	10.78%	3.86%	4.39%
Barclays Capital Municipal Bond Index	10.70%	5.22%	5.37%
Barclays Capital 20 Year Municipal Bond Index	13.98%	5.27%	6.01%

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to February 9, 2006 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes. If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Eaton Vance Municipal Opportunities Fund

Investment Objective

The Fund’s investment objective is to seek to maximize after-tax total return.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance Municipal Opportunities Fund	Class A	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance Municipal Opportunities Fund		Class A	Class I
Management Fees		0.60%	0.60%
Distribution and Service (12b-1) Fees		0.25%	none
Other Expenses		0.79%	0.79%
Total Annual Fund Operating Expenses		1.64%	1.39%
Expense Reimbursement	[1]	(0.54%)	(0.54%)
Total Annual Fund Operating Expenses After Expense Reimbursement		1.10%	0.85%

Example.

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance Municipal Opportunities Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	582	917	1,276	2,283
Class I	87	387	709	1,622

Expense Example, No Redemption	Eaton Vance Arizona Municipal Income Fund Class A 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Arizona Municipal Income Fund Class B 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Arizona Municipal Income Fund Class C 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Arizona Municipal Income Fund Class I 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Connecticut Municipal Income Fund Class A 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Connecticut Municipal Income Fund Class B 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Connecticut Municipal Income Fund Class C 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Connecticut Municipal Income Fund Class I 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance New Jersey Municipal Income Fund Class A 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance New Jersey Municipal Income Fund Class C 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance New Jersey Municipal Income Fund Class I 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Pennsylvania Municipal Income Fund Class A 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Pennsylvania Municipal Income Fund Class B 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Pennsylvania Municipal Income Fund Class C 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Pennsylvania Municipal Income Fund Class I 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Minnesota Municipal Income Fund Class A 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Minnesota Municipal Income Fund Class B 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Minnesota Municipal Income Fund Class C 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Minnesota Municipal Income Fund Class I 12/1/2012 - 12/1/2012 USD ($)
[ExpenseExampleNoRedemptionAbstract]
1 Year	549	154	154	57	553	158	158	60	556	161	64	555	160	160	63	545	150	150	53
3 Years	706	477	477	179	718	490	490	189	727	499	202	724	496	496	199	694	465	465	167
5 Years	877	824	824	313	898	845	845	329	914	860	351	908	855	855	346	857	803	803	291
10 Years	1,372	1,599	1,802	701	1,418	1,643	1,845	738	1,452	1,878	786	1,440	1,666	1,867	774	1,327	1,554	1,757	653

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year , the Fund's portfolio turnover rate was 85 % of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations, the interest on which is exempt from regular federal income tax (the “80% Policy”).  The Fund may invest without limit in obligations the interest from which is subject to the federal alternative minimum tax.  The Fund has a flexible investment strategy and may invest in obligations of any duration and credit quality. The Fund also may invest up to 50% of its net assets in obligations rated below investment grade (“junk bonds”).  Below investment grade obligations are those obligations rated below Baa by Moody’s Investors Service, Inc. (“Moody’s”), or below BBB by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”).  For the purposes of rating restrictions, the higher rating is used.  The Fund may invest up to 20% of its net assets in other debt obligations, including (but not limited to) taxable municipal obligations, U.S. Treasury securities and obligations of the U.S. Government, its agencies and instrumentalities (“Agency Securities”).  

The Fund may purchase derivative instruments, which derive their value from another instrument, security or index. The Fund may purchase or sell various kinds of residual interest bonds, financial futures contracts and options thereon to hedge against changes in interest rates or as a substitute for the purchase of portfolio securities. The Fund also may enter into interest rate swaps, forward rate contracts and credit derivatives, which may include credit default swaps, total return swaps or credit options, as well as purchase an instrument that has greater or lesser credit risk than the municipal bonds underlying the instrument.

In pursuing its investment objective, the Fund may acquire municipal obligations with varying maturities .  Depending on the Fund’s average maturity, the interest rate risk described below may be more or less significant for the Fund. The longer the Fund’s average maturity the more significant interest rate risk will be for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market.  In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio managers generally will seek to enhance after-tax total return by balancing investment considerations and tax considerations.  The Fund expects to actively engage in relative value trading to take advantage of price appreciation opportunities or to realize capital losses.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax. The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk.  Fixed income securities will generally decline in value because of an increase in interest rates.  When the Fund’s average maturity is longer, the Fund will be more sensitive to changes in interest rates than when the Fund’s average maturity is shorter.

Duration Risk.  Duration measures the time-weighted expected cash flows of a fixed-income security, which can determine its sensitivity to changes in the general level of interest rates. Securities with longer durations tend to be more sensitive to interest rate changes than securities with shorter durations. A mutual fund with a longer dollar-weighted average duration can be expected to be more sensitive to interest rate changes than a fund with a shorter dollar-weighted average duration. Duration differs from maturity in that it considers a security’s coupon payments in addition to the amount of time until the security matures. Various techniques may be used to shorten or lengthen Fund duration. As the value of a security changes over time, so will its duration.

Maturity Risk.  Interest rate risk will generally affect the price of a fixed income security more if the security has a longer maturity. Fixed income securities with longer maturities will therefore be more volatile than other fixed income securities with shorter maturities. Conversely, fixed income securities with shorter maturities will be less volatile but generally provide lower returns than fixed income securities with longer maturities. The average maturity of the Fund’s investments will affect the volatility of the Fund’s share price.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Tax-Sensitive Investing Risk. The Fund’s tax-sensitive strategy may cause the Fund to hold a security in order to achieve more favorable tax-treatment or to sell a security in order to create tax losses. The Fund’s ability to utilize various tax-management techniques may be curtailed or eliminated in the future by tax legislation or regulation. There can be no assurance that the Fund will be able to minimize taxable distributions to investors and a portion of the Fund’s distributions may be taxable.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector Concentration Risk.  Because the Fund may concentrate its investments in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that sector or type of obligation and may fluctuate more than that of a less concentrated fund.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Risk of U.S. Government-Sponsored Agencies.  Although certain U.S. Government-sponsored agencies (such as the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association ) may be chartered or sponsored by acts of Congress, their securities are neither issued nor guaranteed by the U.S. Treasury.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.   In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person .  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy .

Performance

Performance history will be available for the Fund after the Fund has been in operation for one full calendar year.

Eaton Vance New Jersey Municipal Income Fund

Investment Objective

The Fund’s investment objective is to provide current income exempt from regular federal income tax and New Jersey state personal income tax.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance New Jersey Municipal Income Fund	Class A	Class C	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance New Jersey Municipal Income Fund	Class A	Class C	Class I
Management Fees	0.41%	0.41%	0.41%
Distribution and Service (12b-1) Fees	0.20%	0.95%	none
Interest Expense	0.07%	0.07%	0.07%
Other Expenses other than Interest Expense	0.15%	0.15%	0.15%
Other Expenses	0.22%	0.22%	0.22%
Total Annual Fund Operating Expenses	0.83%	1.58%	0.63%

Example:  

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance New Jersey Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	556	727	914	1,452
Class C	261	499	860	1,878
Class I	64	202	351	786

Expense Example, No Redemption Eaton Vance New Jersey Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	556	727	914	1,452
Class C	161	499	860	1,878
Class I	64	202	351	786

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 15 % of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more.  The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.   Investments rated below investment grade and comparable unrated securities (“junk bonds”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.   The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.   The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.  Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

During the ten years ended December 31, 2011, the highest quarterly total return for Class A was 12.85% for the quarter ended September 30, 2009, and the lowest quarterly return was –15.29% for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012) was 10.32%.   For the 30 days ended July 31, 2012, the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 40.83%) for Class A shares were 2.86% and 4.83%, respectively, for Class C shares were 2.26% and 3.82%, respectively, and for Class I shares were 3.20% and 5.41%, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Average Annual Total Returns Eaton Vance New Jersey Municipal Income Fund	1 Year	5 Years	10 Years
Class A	4.28%	0.33%	3.31%
Class A After Taxes on Distributions	4.27%	0.32%	3.30%
Class A After Taxes on Distributions and Sales	4.46%	0.93%	3.51%
Class C	7.70%	0.57%	3.04%
Class I	9.81%	1.49%	3.90%
Barclays Capital Municipal Bond Index	10.70%	5.22%	5.37%
Barclays Capital 20 Year Municipal Bond Index	13.98%	5.27%	6.01%

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class C.  The Class C performance shown above for the period prior to December 14, 2005 (commencement of operations) is the performance of Class B shares, which has since converted into another share class, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Eaton Vance Pennsylvania Municipal Income Fund

Investment Objective

The Fund’s investment objective is to provide current income exempt from regular federal income tax and Pennsylvania state and local taxes in the form of an investment exempt from Pennsylvania personal property taxes.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance Pennsylvania Municipal Income Fund	Class A	Class B	Class C	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	5.00%	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance Pennsylvania Municipal Income Fund	Class A	Class B	Class C	Class I
Management Fees	0.41%	0.41%	0.41%	0.41%
Distribution and Service (12b-1) Fees	0.20%	0.95%	0.95%	none
Interest Expense	0.05%	0.05%	0.05%	0.05%
Other Expenses other than Interest Expense	0.16%	0.16%	0.16%	0.16%
Other Expenses	0.21%	0.21%	0.21%	0.21%
Total Annual Fund Operating Expenses	0.82%	1.57%	1.57%	0.62%

Example.  

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance Pennsylvania Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	555	724	908	1,440
Class B	660	896	1,055	1,666
Class C	260	496	855	1,867
Class I	63	199	346	774

Expense Example, No Redemption Eaton Vance Pennsylvania Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	555	724	908	1,440
Class B	160	496	855	1,666
Class C	160	496	855	1,867
Class I	63	199	346	774

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 6% of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more. The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.   The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“junk bonds”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.   In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person .  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy .

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was 12.61 % for the quarter ended March 31, 2009, and the lowest quarterly return was –12. 61 % for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 7.50 %.   For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 37.00%) for Class A shares were 2.62 % and 4.16 %, respectively, for Class B shares were 2.01 % and 3.19 %, respectively, for Class C shares were 2.01 % and 3.19%, respectively, and for Class I shares were 2.95 % and 4.68 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Average Annual Total Returns Eaton Vance Pennsylvania Municipal Income Fund	1 Year	5 Years	10 Years
Class A	3.08%	0.91%	3.44%
Class A After Taxes on Distributions	3.08%	0.90%	3.43%
Class A After Taxes on Distributions and Sales	3.67%	1.41%	3.62%
Class B	2.46%	0.81%	3.19%
Class C	6.34%	1.13%	3.17%
Class I	8.34%	2.11%	4.05%
Barclays Capital Municipal Bond Index	10.70%	5.22%	5.37%
Barclays Capital 20 Year Municipal Bond Index	13.98%	5.27%	6.01%

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to January 12, 2006 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Eaton Vance Minnesota Municipal Income Fund

Investment Objective

The Fund’s investment objective is to provide current income exempt from regular federal income tax and regular Minnesota state personal income tax.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance Minnesota Municipal Income Fund	Class A	Class B	Class C	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	5.00%	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance Minnesota Municipal Income Fund	Class A	Class B	Class C	Class I
Management Fees	0.35%	0.35%	0.35%	0.35%
Distribution and Service (12b-1) Fees	0.20%	0.95%	0.95%	none
Other Expenses	0.17%	0.17%	0.17%	0.17%
Total Annual Fund Operating Expenses	0.72%	1.47%	1.47%	0.52%

Example.  

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance Minnesota Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	545	694	857	1,327
Class B	650	865	1,003	1,554
Class C	250	465	803	1,757
Class I	53	167	291	653

Expense Example, No Redemption Eaton Vance Minnesota Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	545	694	857	1,327
Class B	150	465	803	1,554
Class C	150	465	803	1,757
Class I	53	167	291	653

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 8 % of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”).

The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.

For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more. The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  

Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

During the ten years ended December 31, 2011, the highest quarterly total return for Class A was 8. 23 % for the quarter ended March 31, 2009, and the lowest quarterly return was –6. 19 % for the quarter ended September 30, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 6.62%.  For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 40.10%) for Class A shares were 1.92 % and 3.21 %, respectively, for Class B shares were 1.28 % and 2.14 %, respectively, for Class C shares were 1.28 % and 2.14 %, respectively , and for Class I shares were 2.21 % and 3.69 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Average Annual Total Returns Eaton Vance Minnesota Municipal Income Fund	1 Year	5 Years	10 Years
Class A	5.25%	3.21%	4.28%
Class A After Taxes on Distributions	5.25%	3.20%	4.27%
Class A After Taxes on Distributions and Sales	4.83%	3.31%	4.28%
Class B	4.63%	3.09%	4.03%
Class C	8.64%	3.42%	3.99%
Class I	10.71%	4.27%	4.81%
Barclays Capital Municipal Bond Index	10.70%	5.22%	5.37%
Barclays Capital 20 Year Municipal Bond Index	13.98%	5.27%	6.01%

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to December 21, 2005 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

[1] The investment adviser and administrator have agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 1.10% for Class A shares and 0.85% for Class I shares . This expense reimbursement will continue through November 30, 2013 . Any amendment to or a termination of this reimbursement would require written approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses, interest expense , taxes or litigation expenses. Amounts reimbursed may be recouped by the investment adviser and administrator during the Fund's current fiscal year to the extent actual expenses are less than the contractual expense cap during such year.

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Eaton Vance Minnesota Municipal Income Fund

Investment Objective

The Fund’s investment objective is to provide current income exempt from regular federal income tax and regular Minnesota state personal income tax.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance Minnesota Municipal Income Fund	Class A	Class B	Class C	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	5.00%	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance Minnesota Municipal Income Fund	Class A	Class B	Class C	Class I
Management Fees	0.35%	0.35%	0.35%	0.35%
Distribution and Service (12b-1) Fees	0.20%	0.95%	0.95%	none
Other Expenses	0.17%	0.17%	0.17%	0.17%
Total Annual Fund Operating Expenses	0.72%	1.47%	1.47%	0.52%

Example.  

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance Minnesota Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	545	694	857	1,327
Class B	650	865	1,003	1,554
Class C	250	465	803	1,757
Class I	53	167	291	653

Expense Example, No Redemption Eaton Vance Minnesota Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	545	694	857	1,327
Class B	150	465	803	1,554
Class C	150	465	803	1,757
Class I	53	167	291	653

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 8 % of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”).

The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.

For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more. The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  

Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

During the ten years ended December 31, 2011, the highest quarterly total return for Class A was 8. 23 % for the quarter ended March 31, 2009, and the lowest quarterly return was –6. 19 % for the quarter ended September 30, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 6.62%.  For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 40.10%) for Class A shares were 1.92 % and 3.21 %, respectively, for Class B shares were 1.28 % and 2.14 %, respectively, for Class C shares were 1.28 % and 2.14 %, respectively , and for Class I shares were 2.21 % and 3.69 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Average Annual Total Returns Eaton Vance Minnesota Municipal Income Fund	1 Year	5 Years	10 Years
Class A	5.25%	3.21%	4.28%
Class A After Taxes on Distributions	5.25%	3.20%	4.27%
Class A After Taxes on Distributions and Sales	4.83%	3.31%	4.28%
Class B	4.63%	3.09%	4.03%
Class C	8.64%	3.42%	3.99%
Class I	10.71%	4.27%	4.81%
Barclays Capital Municipal Bond Index	10.70%	5.22%	5.37%
Barclays Capital 20 Year Municipal Bond Index	13.98%	5.27%	6.01%

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to December 21, 2005 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

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Eaton Vance Arizona Municipal Income Fund

Investment Objective

The Fund’s investment objective is to provide current income exempt from regular federal income tax and Arizona state personal income tax.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance Arizona Municipal Income Fund	Class A	Class B	Class C	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	5.00%	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance Arizona Municipal Income Fund	Class A	Class B	Class C	Class I
Management Fees	0.33%	0.33%	0.33%	0.33%
Distribution and Service (12b-1) Fees	0.20%	0.95%	0.95%	none
Interest Expense	0.02%	0.02%	0.02%	0.02%
Other Expenses other than Interest Expense	0.21%	0.21%	0.21%	0.21%
Other Expenses	0.23%	0.23%	0.23%	0.23%
Total Annual Fund Operating Expenses	0.76%	1.51%	1.51%	0.56%

Example.

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance Arizona Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	549	706	877	1,372
Class B	654	877	1,024	1,599
Class C	254	477	824	1,802
Class I	57	179	313	701

Expense Example, No Redemption Eaton Vance Arizona Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	549	706	877	1,372
Class B	154	477	824	1,599
Class C	154	477	824	1,802
Class I	57	179	313	701

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 8 % of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions , if securities are rated differently by the rating agencies , the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more.  The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.   In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.  

During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was 9. 41 % for the quarter ended September 30, 2009, and the lowest quarterly return was –7. 54 % for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 7.32 %.  For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 37.95%) for Class A shares were 2.36 % and 3.80 %, respectively, for Class B shares were 1.74 % and 2.80 %, respectively, for Class C shares were 1.74 % and 2.80 %, respectively , and for Class I shares were 2.68 % and 4.32 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Average Annual Total Returns Eaton Vance Arizona Municipal Income Fund	1 Year	5 Years	10 Years
Class A	6.39%	2.91%	4.41%
Class A After Taxes on Distributions	6.35%	2.90%	4.40%
Class A After Taxes on Distributions and Sales	5.66%	3.07%	4.41%
Class B	5.78%	2.79%	4.14%
Class C	9.88%	3.15%	4.14%
Class I	11.82%	3.94%	4.93%
Barclays Capital Municipal Bond Index	10.70%	5.22%	5.37%
Barclays Capital 20 Year Municipal Bond Index	13.98%	5.27%	6.01%

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to December 16, 2005 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

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Eaton Vance Municipal Opportunities Fund

Investment Objective

The Fund’s investment objective is to seek to maximize after-tax total return.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance Municipal Opportunities Fund	Class A	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance Municipal Opportunities Fund		Class A	Class I
Management Fees		0.60%	0.60%
Distribution and Service (12b-1) Fees		0.25%	none
Other Expenses		0.79%	0.79%
Total Annual Fund Operating Expenses		1.64%	1.39%
Expense Reimbursement	[1]	(0.54%)	(0.54%)
Total Annual Fund Operating Expenses After Expense Reimbursement		1.10%	0.85%

Example.

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance Municipal Opportunities Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	582	917	1,276	2,283
Class I	87	387	709	1,622

Expense Example, No Redemption	Eaton Vance Arizona Municipal Income Fund Class A 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Arizona Municipal Income Fund Class B 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Arizona Municipal Income Fund Class C 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Arizona Municipal Income Fund Class I 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Connecticut Municipal Income Fund Class A 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Connecticut Municipal Income Fund Class B 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Connecticut Municipal Income Fund Class C 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Connecticut Municipal Income Fund Class I 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance New Jersey Municipal Income Fund Class A 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance New Jersey Municipal Income Fund Class C 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance New Jersey Municipal Income Fund Class I 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Pennsylvania Municipal Income Fund Class A 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Pennsylvania Municipal Income Fund Class B 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Pennsylvania Municipal Income Fund Class C 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Pennsylvania Municipal Income Fund Class I 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Minnesota Municipal Income Fund Class A 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Minnesota Municipal Income Fund Class B 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Minnesota Municipal Income Fund Class C 12/1/2012 - 12/1/2012 USD ($)	Eaton Vance Minnesota Municipal Income Fund Class I 12/1/2012 - 12/1/2012 USD ($)
[ExpenseExampleNoRedemptionAbstract]
1 Year	549	154	154	57	553	158	158	60	556	161	64	555	160	160	63	545	150	150	53
3 Years	706	477	477	179	718	490	490	189	727	499	202	724	496	496	199	694	465	465	167
5 Years	877	824	824	313	898	845	845	329	914	860	351	908	855	855	346	857	803	803	291
10 Years	1,372	1,599	1,802	701	1,418	1,643	1,845	738	1,452	1,878	786	1,440	1,666	1,867	774	1,327	1,554	1,757	653

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year , the Fund's portfolio turnover rate was 85 % of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations, the interest on which is exempt from regular federal income tax (the “80% Policy”).  The Fund may invest without limit in obligations the interest from which is subject to the federal alternative minimum tax.  The Fund has a flexible investment strategy and may invest in obligations of any duration and credit quality. The Fund also may invest up to 50% of its net assets in obligations rated below investment grade (“junk bonds”).  Below investment grade obligations are those obligations rated below Baa by Moody’s Investors Service, Inc. (“Moody’s”), or below BBB by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”).  For the purposes of rating restrictions, the higher rating is used.  The Fund may invest up to 20% of its net assets in other debt obligations, including (but not limited to) taxable municipal obligations, U.S. Treasury securities and obligations of the U.S. Government, its agencies and instrumentalities (“Agency Securities”).  

The Fund may purchase derivative instruments, which derive their value from another instrument, security or index. The Fund may purchase or sell various kinds of residual interest bonds, financial futures contracts and options thereon to hedge against changes in interest rates or as a substitute for the purchase of portfolio securities. The Fund also may enter into interest rate swaps, forward rate contracts and credit derivatives, which may include credit default swaps, total return swaps or credit options, as well as purchase an instrument that has greater or lesser credit risk than the municipal bonds underlying the instrument.

In pursuing its investment objective, the Fund may acquire municipal obligations with varying maturities .  Depending on the Fund’s average maturity, the interest rate risk described below may be more or less significant for the Fund. The longer the Fund’s average maturity the more significant interest rate risk will be for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market.  In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio managers generally will seek to enhance after-tax total return by balancing investment considerations and tax considerations.  The Fund expects to actively engage in relative value trading to take advantage of price appreciation opportunities or to realize capital losses.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax. The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk.  Fixed income securities will generally decline in value because of an increase in interest rates.  When the Fund’s average maturity is longer, the Fund will be more sensitive to changes in interest rates than when the Fund’s average maturity is shorter.

Duration Risk.  Duration measures the time-weighted expected cash flows of a fixed-income security, which can determine its sensitivity to changes in the general level of interest rates. Securities with longer durations tend to be more sensitive to interest rate changes than securities with shorter durations. A mutual fund with a longer dollar-weighted average duration can be expected to be more sensitive to interest rate changes than a fund with a shorter dollar-weighted average duration. Duration differs from maturity in that it considers a security’s coupon payments in addition to the amount of time until the security matures. Various techniques may be used to shorten or lengthen Fund duration. As the value of a security changes over time, so will its duration.

Maturity Risk.  Interest rate risk will generally affect the price of a fixed income security more if the security has a longer maturity. Fixed income securities with longer maturities will therefore be more volatile than other fixed income securities with shorter maturities. Conversely, fixed income securities with shorter maturities will be less volatile but generally provide lower returns than fixed income securities with longer maturities. The average maturity of the Fund’s investments will affect the volatility of the Fund’s share price.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Tax-Sensitive Investing Risk. The Fund’s tax-sensitive strategy may cause the Fund to hold a security in order to achieve more favorable tax-treatment or to sell a security in order to create tax losses. The Fund’s ability to utilize various tax-management techniques may be curtailed or eliminated in the future by tax legislation or regulation. There can be no assurance that the Fund will be able to minimize taxable distributions to investors and a portion of the Fund’s distributions may be taxable.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector Concentration Risk.  Because the Fund may concentrate its investments in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that sector or type of obligation and may fluctuate more than that of a less concentrated fund.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Risk of U.S. Government-Sponsored Agencies.  Although certain U.S. Government-sponsored agencies (such as the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association ) may be chartered or sponsored by acts of Congress, their securities are neither issued nor guaranteed by the U.S. Treasury.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.   In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person .  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy .

Performance

Performance history will be available for the Fund after the Fund has been in operation for one full calendar year.

[1] The investment adviser and administrator have agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 1.10% for Class A shares and 0.85% for Class I shares . This expense reimbursement will continue through November 30, 2013 . Any amendment to or a termination of this reimbursement would require written approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses, interest expense , taxes or litigation expenses. Amounts reimbursed may be recouped by the investment adviser and administrator during the Fund's current fiscal year to the extent actual expenses are less than the contractual expense cap during such year.

XML

Label

Element

Value

[RiskReturnAbstract]

rr_RiskReturnAbstract

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Jul. 31, 2012

Registrant Name

dei_EntityRegistrantName

Eaton Vance Municipals Trust

Central Index Key

dei_EntityCentralIndexKey

0000778365

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

Dec. 01, 2012

Document Effective Date

dei_DocumentEffectiveDate

Dec. 01, 2012

Prospectus Date

rr_ProspectusDate

Dec. 01, 2012

Eaton Vance Arizona Municipal Income Fund

[RiskReturnAbstract]

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to provide current income exempt from regular federal income tax and Arizona state personal income tax.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 8 % of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

8.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions , if securities are rated differently by the rating agencies , the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more.  The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions , if securities are rated differently by the rating agencies , the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.   In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Risk Lose Money [Text]

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The Fund is not a complete investment program and you may lose money by investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.

Bar Chart and Performance Table [Heading]

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Performance

Performance Narrative [Text Block]

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The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.  

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.eatonvance.com

Performance Past Does Not Indicate Future [Text]

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Past performance (both before and after taxes) is no guarantee of future results.

Bar Chart Does Not Reflect Sales Loads [Text]

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The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.

Bar Chart Closing [Text Block]

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During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was 9. 41 % for the quarter ended September 30, 2009, and the lowest quarterly return was –7. 54 % for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 7.32 %.  For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 37.95%) for Class A shares were 2.36 % and 3.80 %, respectively, for Class B shares were 1.74 % and 2.80 %, respectively, for Class C shares were 1.74 % and 2.80 %, respectively , and for Class I shares were 2.68 % and 4.32 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Highest Quarterly Return, Label

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During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

9.41%

Lowest Quarterly Return, Label

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and the lowest quarterly return was

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(7.54%)

Performance Table Does Reflect Sales Loads

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These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  

Performance Table Not Relevant to Tax Deferred

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 After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  

Performance Table One Class of after Tax Shown [Text]

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After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.

Performance Table Explanation after Tax Higher

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Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text]

rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod

The Class C performance shown above for the period prior to December 16, 2005 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.

Performance Table Closing [Text Block]

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These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to December 16, 2005 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Thirty Day Yield Phone

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For current yield information call 1-800-262-1122.

Eaton Vance Arizona Municipal Income Fund | Class A

[RiskReturnAbstract]

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Trading Symbol

dei_TradingSymbol

ETAZX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.75%

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.33%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.20%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.02%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.21%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.76%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

549

3 Years

rr_ExpenseExampleYear03

706

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

877

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,372

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

549

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

706

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

877

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,372

Annual Return 2002

rr_AnnualReturn2002

9.66%

Annual Return 2003

rr_AnnualReturn2003

5.55%

Annual Return 2004

rr_AnnualReturn2004

3.88%

Annual Return 2005

rr_AnnualReturn2005

4.50%

Annual Return 2006

rr_AnnualReturn2006

6.19%

Annual Return 2007

rr_AnnualReturn2007

1.33%

Annual Return 2008

rr_AnnualReturn2008

(14.36%)

Annual Return 2009

rr_AnnualReturn2009

24.32%

Annual Return 2010

rr_AnnualReturn2010

0.53%

Annual Return 2011

rr_AnnualReturn2011

11.71%

1 Year

rr_AverageAnnualReturnYear01

6.39%

5 Years

rr_AverageAnnualReturnYear05

2.91%

10 Years

rr_AverageAnnualReturnYear10

4.41%

Thirty Day Yield Column [Text]

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For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 37.95%) for Class A shares were

Thirty Day Yield

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2.36%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

3.80%

Eaton Vance Arizona Municipal Income Fund | Class B

[RiskReturnAbstract]

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Trading Symbol

dei_TradingSymbol

EVAZX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.33%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.95%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.02%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.21%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.51%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

654

3 Years

rr_ExpenseExampleYear03

877

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,024

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,599

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

154

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

477

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

824

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,599

1 Year

rr_AverageAnnualReturnYear01

5.78%

5 Years

rr_AverageAnnualReturnYear05

2.79%

10 Years

rr_AverageAnnualReturnYear10

4.14%

Thirty Day Yield Column [Text]

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for Class B shares were

Thirty Day Yield

rr_ThirtyDayYield

1.74%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

2.80%

Eaton Vance Arizona Municipal Income Fund | Class C

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

ECAZX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.33%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.95%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.02%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.21%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.51%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

254

3 Years

rr_ExpenseExampleYear03

477

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

824

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,802

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

154

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

477

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

824

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,802

1 Year

rr_AverageAnnualReturnYear01

9.88%

5 Years

rr_AverageAnnualReturnYear05

3.15%

10 Years

rr_AverageAnnualReturnYear10

4.14%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

for Class C shares were

Thirty Day Yield

rr_ThirtyDayYield

1.74%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

2.80%

Eaton Vance Arizona Municipal Income Fund | Class I

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

EIAZX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.33%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Interest Expense

rr_Component1OtherExpensesOverAssets

0.02%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.21%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

57

3 Years

rr_ExpenseExampleYear03

179

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

313

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

701

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

57

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

179

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

313

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

701

1 Year

rr_AverageAnnualReturnYear01

11.82%

5 Years

rr_AverageAnnualReturnYear05

3.94%

10 Years

rr_AverageAnnualReturnYear10

4.93%

Thirty Day Yield Column [Text]

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and for Class I shares were

Thirty Day Yield

rr_ThirtyDayYield

2.86%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

4.32%

Eaton Vance Arizona Municipal Income Fund | After Taxes on Distributions | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.35%

5 Years

rr_AverageAnnualReturnYear05

2.90%

10 Years

rr_AverageAnnualReturnYear10

4.40%

Eaton Vance Arizona Municipal Income Fund | After Taxes on Distributions and Sales | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.66%

5 Years

rr_AverageAnnualReturnYear05

3.07%

10 Years

rr_AverageAnnualReturnYear10

4.41%

Eaton Vance Arizona Municipal Income Fund | Barclays Capital Municipal Bond Index

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.70%

5 Years

rr_AverageAnnualReturnYear05

5.22%

10 Years

rr_AverageAnnualReturnYear10

5.37%

Eaton Vance Arizona Municipal Income Fund | Barclays Capital 20 Year Municipal Bond Index

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.98%

5 Years

rr_AverageAnnualReturnYear05

5.27%

10 Years

rr_AverageAnnualReturnYear10

6.01%

Eaton Vance Connecticut Municipal Income Fund

[RiskReturnAbstract]

rr_RiskReturnAbstract

Objective [Heading]

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Investment Objective

Objective, Primary [Text Block]

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The Fund’s investment objective is to provide current income exempt from regular federal income tax and Connecticut state personal income tax.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

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The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 13 % of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

13.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.  

Expense Example Narrative [Text Block]

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This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

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Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more.  The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

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Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.  Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Risk Lose Money [Text]

rr_RiskLoseMoney

The Fund is not a complete investment program and you may lose money by investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.

Bar Chart and Performance Table [Heading]

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Performance

Performance Narrative [Text Block]

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The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.eatonvance.com

Performance Past Does Not Indicate Future [Text]

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Past performance (both before and after taxes) is no guarantee of future results.

Bar Chart Does Not Reflect Sales Loads [Text]

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The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.

Bar Chart Closing [Text Block]

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During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was 8. 56 % for the quarter ended September 30, 2009, and the lowest quarterly return was –5. 52 % for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 6.35%.  For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 39.36%) for Class A shares were 2.23 % and 3.68 %, respectively, for Class B shares were 1.61 % and 2.66 %, respectively, for Class C shares were 1.61 % and 2.66 %, respectively, and for Class I shares were 2.54 % and 4.19 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Highest Quarterly Return, Label

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During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

8.56%

Lowest Quarterly Return, Label

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and the lowest quarterly return was

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(5.52%)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  

Performance Table Not Relevant to Tax Deferred

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 After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  

Performance Table One Class of after Tax Shown [Text]

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After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.

Performance Table Explanation after Tax Higher

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Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text]

rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod

The Class C performance shown above for the period prior to February 9, 2006 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.

Performance Table Closing [Text Block]

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These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to February 9, 2006 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes. If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Thirty Day Yield Phone

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For current yield information call 1-800-262-1122.

Eaton Vance Connecticut Municipal Income Fund | Class A

[RiskReturnAbstract]

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Trading Symbol

dei_TradingSymbol

ETCTX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.75%

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.37%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.20%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.05%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.18%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

553

3 Years

rr_ExpenseExampleYear03

718

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

898

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,418

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

553

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

718

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

898

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,418

Annual Return 2002

rr_AnnualReturn2002

7.70%

Annual Return 2003

rr_AnnualReturn2003

5.01%

Annual Return 2004

rr_AnnualReturn2004

3.09%

Annual Return 2005

rr_AnnualReturn2005

3.13%

Annual Return 2006

rr_AnnualReturn2006

5.77%

Annual Return 2007

rr_AnnualReturn2007

1.40%

Annual Return 2008

rr_AnnualReturn2008

(12.10%)

Annual Return 2009

rr_AnnualReturn2009

20.71%

Annual Return 2010

rr_AnnualReturn2010

0.75%

Annual Return 2011

rr_AnnualReturn2011

10.67%

1 Year

rr_AverageAnnualReturnYear01

5.40%

5 Years

rr_AverageAnnualReturnYear05

2.69%

10 Years

rr_AverageAnnualReturnYear10

3.80%

Thirty Day Yield Column [Text]

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For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 39.36%) for Class A shares were

Thirty Day Yield

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2.23%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

3.68%

Eaton Vance Connecticut Municipal Income Fund | Class B

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

EVCTX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.37%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.95%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.05%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.18%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.55%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

658

3 Years

rr_ExpenseExampleYear03

890

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,045

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,643

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

158

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

490

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

845

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,643

1 Year

rr_AverageAnnualReturnYear01

4.77%

5 Years

rr_AverageAnnualReturnYear05

2.60%

10 Years

rr_AverageAnnualReturnYear10

3.54%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

for Class B shares were

Thirty Day Yield

rr_ThirtyDayYield

1.61%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

2.66%

Eaton Vance Connecticut Municipal Income Fund | Class C

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

ECCTX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.37%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.95%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.05%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.18%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.55%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

258

3 Years

rr_ExpenseExampleYear03

490

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

845

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,845

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

158

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

490

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

845

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,845

1 Year

rr_AverageAnnualReturnYear01

8.77%

5 Years

rr_AverageAnnualReturnYear05

2.94%

10 Years

rr_AverageAnnualReturnYear10

3.54%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

for Class C shares were

Thirty Day Yield

rr_ThirtyDayYield

1.61%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

2.66%

Eaton Vance Connecticut Municipal Income Fund | Class I

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

EICTX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.37%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Interest Expense

rr_Component1OtherExpensesOverAssets

0.05%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.17%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.59%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

60

3 Years

rr_ExpenseExampleYear03

189

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

329

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

738

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

60

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

189

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

329

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

738

1 Year

rr_AverageAnnualReturnYear01

10.78%

5 Years

rr_AverageAnnualReturnYear05

3.86%

10 Years

rr_AverageAnnualReturnYear10

4.39%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

and for Class I shares were

Thirty Day Yield

rr_ThirtyDayYield

2.54%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

4.19%

Eaton Vance Connecticut Municipal Income Fund | After Taxes on Distributions | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.39%

5 Years

rr_AverageAnnualReturnYear05

2.69%

10 Years

rr_AverageAnnualReturnYear10

3.79%

Eaton Vance Connecticut Municipal Income Fund | After Taxes on Distributions and Sales | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.00%

5 Years

rr_AverageAnnualReturnYear05

2.88%

10 Years

rr_AverageAnnualReturnYear10

3.85%

Eaton Vance Connecticut Municipal Income Fund | Barclays Capital Municipal Bond Index

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.70%

5 Years

rr_AverageAnnualReturnYear05

5.22%

10 Years

rr_AverageAnnualReturnYear10

5.37%

Eaton Vance Connecticut Municipal Income Fund | Barclays Capital 20 Year Municipal Bond Index

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.98%

5 Years

rr_AverageAnnualReturnYear05

5.27%

10 Years

rr_AverageAnnualReturnYear10

6.01%

Eaton Vance Municipal Opportunities Fund

[RiskReturnAbstract]

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to seek to maximize after-tax total return.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year , the Fund's portfolio turnover rate was 85 % of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

85.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations, the interest on which is exempt from regular federal income tax (the “80% Policy”).  The Fund may invest without limit in obligations the interest from which is subject to the federal alternative minimum tax.  The Fund has a flexible investment strategy and may invest in obligations of any duration and credit quality. The Fund also may invest up to 50% of its net assets in obligations rated below investment grade (“junk bonds”).  Below investment grade obligations are those obligations rated below Baa by Moody’s Investors Service, Inc. (“Moody’s”), or below BBB by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”).  For the purposes of rating restrictions, the higher rating is used.  The Fund may invest up to 20% of its net assets in other debt obligations, including (but not limited to) taxable municipal obligations, U.S. Treasury securities and obligations of the U.S. Government, its agencies and instrumentalities (“Agency Securities”).  

The Fund may purchase derivative instruments, which derive their value from another instrument, security or index. The Fund may purchase or sell various kinds of residual interest bonds, financial futures contracts and options thereon to hedge against changes in interest rates or as a substitute for the purchase of portfolio securities. The Fund also may enter into interest rate swaps, forward rate contracts and credit derivatives, which may include credit default swaps, total return swaps or credit options, as well as purchase an instrument that has greater or lesser credit risk than the municipal bonds underlying the instrument.

In pursuing its investment objective, the Fund may acquire municipal obligations with varying maturities .  Depending on the Fund’s average maturity, the interest rate risk described below may be more or less significant for the Fund. The longer the Fund’s average maturity the more significant interest rate risk will be for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market.  In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio managers generally will seek to enhance after-tax total return by balancing investment considerations and tax considerations.  The Fund expects to actively engage in relative value trading to take advantage of price appreciation opportunities or to realize capital losses.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax. The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations, the interest on which is exempt from regular federal income tax (the “80% Policy”).  The Fund may invest without limit in obligations the interest from which is subject to the federal alternative minimum tax.  The Fund has a flexible investment strategy and may invest in obligations of any duration and credit quality. The Fund also may invest up to 50% of its net assets in obligations rated below investment grade (“junk bonds”).  Below investment grade obligations are those obligations rated below Baa by Moody’s Investors Service, Inc. (“Moody’s”), or below BBB by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”).  For the purposes of rating restrictions, the higher rating is used.  The Fund may invest up to 20% of its net assets in other debt obligations, including (but not limited to) taxable municipal obligations, U.S. Treasury securities and obligations of the U.S. Government, its agencies and instrumentalities (“Agency Securities”).  

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk.  Fixed income securities will generally decline in value because of an increase in interest rates.  When the Fund’s average maturity is longer, the Fund will be more sensitive to changes in interest rates than when the Fund’s average maturity is shorter.

Duration Risk.  Duration measures the time-weighted expected cash flows of a fixed-income security, which can determine its sensitivity to changes in the general level of interest rates. Securities with longer durations tend to be more sensitive to interest rate changes than securities with shorter durations. A mutual fund with a longer dollar-weighted average duration can be expected to be more sensitive to interest rate changes than a fund with a shorter dollar-weighted average duration. Duration differs from maturity in that it considers a security’s coupon payments in addition to the amount of time until the security matures. Various techniques may be used to shorten or lengthen Fund duration. As the value of a security changes over time, so will its duration.

Maturity Risk.  Interest rate risk will generally affect the price of a fixed income security more if the security has a longer maturity. Fixed income securities with longer maturities will therefore be more volatile than other fixed income securities with shorter maturities. Conversely, fixed income securities with shorter maturities will be less volatile but generally provide lower returns than fixed income securities with longer maturities. The average maturity of the Fund’s investments will affect the volatility of the Fund’s share price.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Tax-Sensitive Investing Risk. The Fund’s tax-sensitive strategy may cause the Fund to hold a security in order to achieve more favorable tax-treatment or to sell a security in order to create tax losses. The Fund’s ability to utilize various tax-management techniques may be curtailed or eliminated in the future by tax legislation or regulation. There can be no assurance that the Fund will be able to minimize taxable distributions to investors and a portion of the Fund’s distributions may be taxable.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector Concentration Risk.  Because the Fund may concentrate its investments in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that sector or type of obligation and may fluctuate more than that of a less concentrated fund.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Risk of U.S. Government-Sponsored Agencies.  Although certain U.S. Government-sponsored agencies (such as the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association ) may be chartered or sponsored by acts of Congress, their securities are neither issued nor guaranteed by the U.S. Treasury.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.   In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person .  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy .

Risk Lose Money [Text]

rr_RiskLoseMoney

The Fund is not a complete investment program and you may lose money by investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

Performance history will be available for the Fund after the Fund has been in operation for one full calendar year.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.eatonvance.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (both before and after taxes) is no guarantee of future results.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.

Eaton Vance Municipal Opportunities Fund | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

EMOAX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.75%

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.60%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.79%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.64%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.54%)

^[1]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

1.10%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

582

3 Years

rr_ExpenseExampleYear03

917

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,276

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,283

Eaton Vance Municipal Opportunities Fund | Class I

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

EMOIX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.60%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.79%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.39%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.54%)

^[1]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

0.85%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

87

3 Years

rr_ExpenseExampleYear03

387

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

709

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,622

Eaton Vance New Jersey Municipal Income Fund

[RiskReturnAbstract]

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to provide current income exempt from regular federal income tax and New Jersey state personal income tax.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 15 % of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

15.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example:  

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more.  The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.   Investments rated below investment grade and comparable unrated securities (“junk bonds”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.   The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.   The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.  Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Risk Lose Money [Text]

rr_RiskLoseMoney

The Fund is not a complete investment program and you may lose money by investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.eatonvance.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (both before and after taxes) is no guarantee of future results.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the ten years ended December 31, 2011, the highest quarterly total return for Class A was 12.85% for the quarter ended September 30, 2009, and the lowest quarterly return was –15.29% for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012) was 10.32%.   For the 30 days ended July 31, 2012, the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 40.83%) for Class A shares were 2.86% and 4.83%, respectively, for Class C shares were 2.26% and 3.82%, respectively, and for Class I shares were 3.20% and 5.41%, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.85%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

and the lowest quarterly return was

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(15.29%)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

 After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text]

rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod

The Class C performance shown above for the period prior to December 14, 2005 (commencement of operations) is the performance of Class B shares, which has since converted into another share class, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class C.  The Class C performance shown above for the period prior to December 14, 2005 (commencement of operations) is the performance of Class B shares, which has since converted into another share class, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Thirty Day Yield Phone

rr_ThirtyDayYieldPhone

For current yield information call 1-800-262-1122.

Eaton Vance New Jersey Municipal Income Fund | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

ETNJX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.75%

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.41%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.20%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.07%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.15%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.83%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

556

3 Years

rr_ExpenseExampleYear03

727

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

914

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,452

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

556

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

727

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

914

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,452

Annual Return 2002

rr_AnnualReturn2002

9.01%

Annual Return 2003

rr_AnnualReturn2003

6.02%

Annual Return 2004

rr_AnnualReturn2004

3.69%

Annual Return 2005

rr_AnnualReturn2005

4.76%

Annual Return 2006

rr_AnnualReturn2006

8.48%

Annual Return 2007

rr_AnnualReturn2007

(1.76%)

Annual Return 2008

rr_AnnualReturn2008

(24.26%)

Annual Return 2009

rr_AnnualReturn2009

32.18%

Annual Return 2010

rr_AnnualReturn2010

(0.82%)

Annual Return 2011

rr_AnnualReturn2011

9.47%

1 Year

rr_AverageAnnualReturnYear01

4.28%

5 Years

rr_AverageAnnualReturnYear05

0.33%

10 Years

rr_AverageAnnualReturnYear10

3.31%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

For the 30 days ended July 31, 2012, the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 40.83%) for Class A shares were

Thirty Day Yield

rr_ThirtyDayYield

2.86%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

4.83%

Eaton Vance New Jersey Municipal Income Fund | Class C

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

ECNJX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.41%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.95%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.07%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.15%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.58%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

261

3 Years

rr_ExpenseExampleYear03

499

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

860

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,878

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

161

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

499

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

860

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,878

1 Year

rr_AverageAnnualReturnYear01

7.70%

5 Years

rr_AverageAnnualReturnYear05

0.57%

10 Years

rr_AverageAnnualReturnYear10

3.04%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

for Class C shares were

Thirty Day Yield

rr_ThirtyDayYield

2.26%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

3.82%

Eaton Vance New Jersey Municipal Income Fund | Class I

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

EINJX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.41%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Interest Expense

rr_Component1OtherExpensesOverAssets

0.07%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.15%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.63%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

64

3 Years

rr_ExpenseExampleYear03

202

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

351

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

786

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

64

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

202

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

351

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

786

1 Year

rr_AverageAnnualReturnYear01

9.81%

5 Years

rr_AverageAnnualReturnYear05

1.49%

10 Years

rr_AverageAnnualReturnYear10

3.90%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

and for Class I shares were

Thirty Day Yield

rr_ThirtyDayYield

3.20%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

5.41%

Eaton Vance New Jersey Municipal Income Fund | After Taxes on Distributions | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.27%

5 Years

rr_AverageAnnualReturnYear05

0.32%

10 Years

rr_AverageAnnualReturnYear10

3.30%

Eaton Vance New Jersey Municipal Income Fund | After Taxes on Distributions and Sales | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.46%

5 Years

rr_AverageAnnualReturnYear05

0.93%

10 Years

rr_AverageAnnualReturnYear10

3.51%

Eaton Vance New Jersey Municipal Income Fund | Barclays Capital Municipal Bond Index

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.70%

5 Years

rr_AverageAnnualReturnYear05

5.22%

10 Years

rr_AverageAnnualReturnYear10

5.37%

Eaton Vance New Jersey Municipal Income Fund | Barclays Capital 20 Year Municipal Bond Index

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.98%

5 Years

rr_AverageAnnualReturnYear05

5.27%

10 Years

rr_AverageAnnualReturnYear10

6.01%

Eaton Vance Pennsylvania Municipal Income Fund

[RiskReturnAbstract]

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to provide current income exempt from regular federal income tax and Pennsylvania state and local taxes in the form of an investment exempt from Pennsylvania personal property taxes.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 6% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

6.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.  

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more. The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.   The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“junk bonds”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.   In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person .  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy .

Risk Lose Money [Text]

rr_RiskLoseMoney

The Fund is not a complete investment program and you may lose money by investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.

Bar Chart and Performance Table [Heading]

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Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.eatonvance.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (both before and after taxes) is no guarantee of future results.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.

Bar Chart Closing [Text Block]

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During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was 12.61 % for the quarter ended March 31, 2009, and the lowest quarterly return was –12. 61 % for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 7.50 %.   For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 37.00%) for Class A shares were 2.62 % and 4.16 %, respectively, for Class B shares were 2.01 % and 3.19 %, respectively, for Class C shares were 2.01 % and 3.19%, respectively, and for Class I shares were 2.95 % and 4.68 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Highest Quarterly Return, Label

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During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.61%

Lowest Quarterly Return, Label

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and the lowest quarterly return was

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(12.61%)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

 After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.

Performance Table Explanation after Tax Higher

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Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text]

rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod

The Class C performance shown above for the period prior to January 12, 2006 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.

Performance Table Closing [Text Block]

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These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to January 12, 2006 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Thirty Day Yield Phone

rr_ThirtyDayYieldPhone

For current yield information call 1-800-262-1122.

Eaton Vance Pennsylvania Municipal Income Fund | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

ETPAX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.75%

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.41%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.20%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.05%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.16%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.82%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

555

3 Years

rr_ExpenseExampleYear03

724

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

908

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,440

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

555

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

724

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

908

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,440

Annual Return 2002

rr_AnnualReturn2002

7.02%

Annual Return 2003

rr_AnnualReturn2003

6.24%

Annual Return 2004

rr_AnnualReturn2004

4.05%

Annual Return 2005

rr_AnnualReturn2005

5.52%

Annual Return 2006

rr_AnnualReturn2006

7.38%

Annual Return 2007

rr_AnnualReturn2007

(0.28%)

Annual Return 2008

rr_AnnualReturn2008

(21.43%)

Annual Return 2009

rr_AnnualReturn2009

31.88%

Annual Return 2010

rr_AnnualReturn2010

(1.77%)

Annual Return 2011

rr_AnnualReturn2011

8.26%

1 Year

rr_AverageAnnualReturnYear01

3.08%

5 Years

rr_AverageAnnualReturnYear05

0.91%

10 Years

rr_AverageAnnualReturnYear10

3.44%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 37.00%) for Class A shares were

Thirty Day Yield

rr_ThirtyDayYield

2.62%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

4.16%

Eaton Vance Pennsylvania Municipal Income Fund | Class B

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

EVPAX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.41%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.95%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.05%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.16%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.57%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

660

3 Years

rr_ExpenseExampleYear03

896

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,055

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,666

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

160

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

496

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

855

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,666

1 Year

rr_AverageAnnualReturnYear01

2.46%

5 Years

rr_AverageAnnualReturnYear05

0.81%

10 Years

rr_AverageAnnualReturnYear10

3.19%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

for Class B shares were

Thirty Day Yield

rr_ThirtyDayYield

2.01%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

3.19%

Eaton Vance Pennsylvania Municipal Income Fund | Class C

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

ECPAX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.41%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.95%

Interest Expense

rr_Component1OtherExpensesOverAssets

0.05%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.16%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.57%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

260

3 Years

rr_ExpenseExampleYear03

496

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

855

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,867

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

160

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

496

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

855

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,867

1 Year

rr_AverageAnnualReturnYear01

6.34%

5 Years

rr_AverageAnnualReturnYear05

1.13%

10 Years

rr_AverageAnnualReturnYear10

3.17%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

for Class C shares were

Thirty Day Yield

rr_ThirtyDayYield

2.01%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

3.19%

Eaton Vance Pennsylvania Municipal Income Fund | Class I

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

EIPAX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.41%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Interest Expense

rr_Component1OtherExpensesOverAssets

0.05%

Other Expenses other than Interest Expense

rr_Component2OtherExpensesOverAssets

0.16%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.62%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

63

3 Years

rr_ExpenseExampleYear03

199

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

346

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

774

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

63

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

199

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

346

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

774

1 Year

rr_AverageAnnualReturnYear01

8.34%

5 Years

rr_AverageAnnualReturnYear05

2.11%

10 Years

rr_AverageAnnualReturnYear10

4.05%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

and for Class I shares were

Thirty Day Yield

rr_ThirtyDayYield

2.95%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

4.68%

Eaton Vance Pennsylvania Municipal Income Fund | After Taxes on Distributions | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.08%

5 Years

rr_AverageAnnualReturnYear05

0.90%

10 Years

rr_AverageAnnualReturnYear10

3.43%

Eaton Vance Pennsylvania Municipal Income Fund | After Taxes on Distributions and Sales | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.67%

5 Years

rr_AverageAnnualReturnYear05

1.41%

10 Years

rr_AverageAnnualReturnYear10

3.62%

Eaton Vance Pennsylvania Municipal Income Fund | Barclays Capital Municipal Bond Index

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.70%

5 Years

rr_AverageAnnualReturnYear05

5.22%

10 Years

rr_AverageAnnualReturnYear10

5.37%

Eaton Vance Pennsylvania Municipal Income Fund | Barclays Capital 20 Year Municipal Bond Index

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.98%

5 Years

rr_AverageAnnualReturnYear05

5.27%

10 Years

rr_AverageAnnualReturnYear10

6.01%

Eaton Vance Minnesota Municipal Income Fund

[RiskReturnAbstract]

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to provide current income exempt from regular federal income tax and regular Minnesota state personal income tax.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 8 % of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

8.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expense Example [Heading]

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Example.  

Expense Example Narrative [Text Block]

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This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

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Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”).

The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.

For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more. The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”).

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  

Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.  Investments rated below investment grade and comparable unrated securities (“ junk bonds ”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.  The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.   Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Risk Lose Money [Text]

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The Fund is not a complete investment program and you may lose money by investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.eatonvance.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (both before and after taxes) is no guarantee of future results.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.

Bar Chart Closing [Text Block]

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During the ten years ended December 31, 2011, the highest quarterly total return for Class A was 8. 23 % for the quarter ended March 31, 2009, and the lowest quarterly return was –6. 19 % for the quarter ended September 30, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012 ) was 6.62%.  For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 40.10%) for Class A shares were 1.92 % and 3.21 %, respectively, for Class B shares were 1.28 % and 2.14 %, respectively, for Class C shares were 1.28 % and 2.14 %, respectively , and for Class I shares were 2.21 % and 3.69 %, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Highest Quarterly Return, Label

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During the ten years ended December 31, 2011 , the highest quarterly total return for Class A was

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

8.23%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

and the lowest quarterly return was

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(6.19%)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

 After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text]

rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod

 The Class C performance shown above for the period prior to December 21, 2005 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.

Performance Table Closing [Text Block]

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These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class C performance shown above for the period prior to December 21, 2005 (commencement of operations) is the performance of Class B shares, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to August 3, 2010 (commencement of operations ) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Thirty Day Yield Phone

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For current yield information call 1-800-262-1122.

Eaton Vance Minnesota Municipal Income Fund | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

ETMNX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.75%

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.35%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.20%

Other Expenses

rr_OtherExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.72%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

545

3 Years

rr_ExpenseExampleYear03

694

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

857

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,327

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

545

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

694

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

857

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,327

Annual Return 2002

rr_AnnualReturn2002

6.41%

Annual Return 2003

rr_AnnualReturn2003

5.33%

Annual Return 2004

rr_AnnualReturn2004

4.00%

Annual Return 2005

rr_AnnualReturn2005

4.81%

Annual Return 2006

rr_AnnualReturn2006

6.27%

Annual Return 2007

rr_AnnualReturn2007

2.02%

Annual Return 2008

rr_AnnualReturn2008

(9.51%)

Annual Return 2009

rr_AnnualReturn2009

20.34%

Annual Return 2010

rr_AnnualReturn2010

0.18%

Annual Return 2011

rr_AnnualReturn2011

10.47%

1 Year

rr_AverageAnnualReturnYear01

5.25%

5 Years

rr_AverageAnnualReturnYear05

3.21%

10 Years

rr_AverageAnnualReturnYear10

4.28%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

For the 30 days ended July 31, 2012 , the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 40.10%) for Class A shares were

Thirty Day Yield

rr_ThirtyDayYield

1.92%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

3.21%

Eaton Vance Minnesota Municipal Income Fund | Class B

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

EVMNX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.35%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.95%

Other Expenses

rr_OtherExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.47%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

650

3 Years

rr_ExpenseExampleYear03

865

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,003

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,554

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

150

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

465

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

803

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,554

1 Year

rr_AverageAnnualReturnYear01

4.63%

5 Years

rr_AverageAnnualReturnYear05

3.09%

10 Years

rr_AverageAnnualReturnYear10

4.03%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

for Class B shares were

Thirty Day Yield

rr_ThirtyDayYield

1.28%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

2.14%

Eaton Vance Minnesota Municipal Income Fund | Class C

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

ECMNX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.35%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.95%

Other Expenses

rr_OtherExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.47%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

250

3 Years

rr_ExpenseExampleYear03

465

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

803

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,757

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

150

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

465

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

803

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,757

1 Year

rr_AverageAnnualReturnYear01

8.64%

5 Years

rr_AverageAnnualReturnYear05

3.42%

10 Years

rr_AverageAnnualReturnYear10

3.99%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

for Class C shares were

Thirty Day Yield

rr_ThirtyDayYield

1.28%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

2.14%

Eaton Vance Minnesota Municipal Income Fund | Class I

[RiskReturnAbstract]

rr_RiskReturnAbstract

Trading Symbol

dei_TradingSymbol

EIMNX

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.35%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.52%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

53

3 Years

rr_ExpenseExampleYear03

167

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

291

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

653

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

53

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

167

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

291

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

653

1 Year

rr_AverageAnnualReturnYear01

10.71%

5 Years

rr_AverageAnnualReturnYear05

4.27%

10 Years

rr_AverageAnnualReturnYear10

4.81%

Thirty Day Yield Column [Text]

rr_ThirtyDayYieldColumnName

and for Class I shares were

Thirty Day Yield

rr_ThirtyDayYield

2.21%

Thirty Day Tax Equivalent Yield

rr_ThirtyDayTaxEquivalentYield

3.69%

Eaton Vance Minnesota Municipal Income Fund | After Taxes on Distributions | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.25%

5 Years

rr_AverageAnnualReturnYear05

3.20%

10 Years

rr_AverageAnnualReturnYear10

4.27%

Eaton Vance Minnesota Municipal Income Fund | After Taxes on Distributions and Sales | Class A

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.83%

5 Years

rr_AverageAnnualReturnYear05

3.31%

10 Years

rr_AverageAnnualReturnYear10

4.28%

Eaton Vance Minnesota Municipal Income Fund | Barclays Capital Municipal Bond Index

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.70%

5 Years

rr_AverageAnnualReturnYear05

5.22%

10 Years

rr_AverageAnnualReturnYear10

5.37%

Eaton Vance Minnesota Municipal Income Fund | Barclays Capital 20 Year Municipal Bond Index

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.98%

5 Years

rr_AverageAnnualReturnYear05

5.27%

10 Years

rr_AverageAnnualReturnYear10

6.01%

[1] The investment adviser and administrator have agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 1.10% for Class A shares and 0.85% for Class I shares . This expense reimbursement will continue through November 30, 2013 . Any amendment to or a termination of this reimbursement would require written approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses, interest expense , taxes or litigation expenses. Amounts reimbursed may be recouped by the investment adviser and administrator during the Fund's current fiscal year to the extent actual expenses are less than the contractual expense cap during such year.

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Eaton Vance New Jersey Municipal Income Fund

Investment Objective

The Fund’s investment objective is to provide current income exempt from regular federal income tax and New Jersey state personal income tax.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 35 of this Prospectus and page 20 of the Fund’s Statement of Additional Information.  

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Eaton Vance New Jersey Municipal Income Fund	Class A	Class C	Class I
Maximum Sales Charge (Load) (as a percentage of offering price)	4.75%	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)	none	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Eaton Vance New Jersey Municipal Income Fund	Class A	Class C	Class I
Management Fees	0.41%	0.41%	0.41%
Distribution and Service (12b-1) Fees	0.20%	0.95%	none
Interest Expense	0.07%	0.07%	0.07%
Other Expenses other than Interest Expense	0.15%	0.15%	0.15%
Other Expenses	0.22%	0.22%	0.22%
Total Annual Fund Operating Expenses	0.83%	1.58%	0.63%

Example:  

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Eaton Vance New Jersey Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	556	727	914	1,452
Class C	261	499	860	1,878
Class I	64	202	351	786

Expense Example, No Redemption Eaton Vance New Jersey Municipal Income Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	556	727	914	1,452
Class C	161	499	860	1,878
Class I	64	202	351	786

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 15 % of the average value of its portfolio.

Principal Investment Strategies

Under normal market circumstances, the Fund invests at least 80% of its net assets in municipal obligations that are exempt from regular federal income tax and the state taxes specified in the Fund’s investment objective (the “80% Policy”).  The Fund may invest without limit in obligations the income from which is subject to the federal alternative minimum tax.  At least 75% of net assets normally will be invested in municipal obligations rated at least investment grade at the time of investment (which are those rated Baa or higher by Moody’s Investors Service, Inc. (“Moody’s”), or BBB or higher by either Standard & Poor’s Ratings Group (“S&P”) or Fitch Ratings (“Fitch”)) or, if unrated, determined by the investment adviser to be of at least investment grade quality. The balance of net assets may be invested in municipal obligations rated below investment grade and in unrated municipal obligations considered to be of comparable quality by the investment adviser (“junk bonds”). The Fund will not invest more than 10% of its net assets in obligations rated below B or in unrated obligations considered to be of comparable quality by the investment adviser.  For purposes of rating restrictions, if securities are rated differently by the rating agencies, the higher rating is used.  Under normal market conditions, the Fund invests at least 65% of its total assets in obligations issued by its state or its political subdivisions, agencies, authorities and instrumentalities.  If consistent with relevant state tax requirements, the Fund may invest up to 35% of its net assets in municipal obligations issued by the governments of Puerto Rico, the U.S. Virgin Islands and Guam.  The Fund is “non-diversified” and may invest, with respect to 50% of its total assets, more than 5% (but not more than 25%) of its total assets in securities of any one issuer (such limitations do not apply to U.S. Government securities).  The Fund may purchase or sell derivative instruments (such as residual interest bonds, futures contracts and options thereon, interest rate swaps, and forward rate contracts) for hedging purposes, to seek total return or as a substitute for the purchase or sale of securities.

In pursuing its investment objective, the Fund normally acquires municipal obligations with maturities of ten years or more.  The Fund’s portfolio often has a longer average maturity than is typical of most other funds that invest primarily in municipal obligations.  As a result, the interest rate risk described below may be more significant for the Fund.  The Fund may concentrate 25% or more of its total assets in certain types of municipal obligations (such as general obligations, municipal leases, revenue bonds and industrial development bonds) and in one or more sectors (such as housing, hospitals, healthcare facilities or utilities).

The investment adviser’s process for selecting obligations for purchase and sale emphasizes the creditworthiness of the issuer or other person obligated to repay the obligation and the relative value of the obligation in the market. In evaluating creditworthiness, the investment adviser considers ratings assigned by rating agencies and generally performs additional credit and investment analysis.  The portfolio manager also may trade securities to seek to minimize taxable capital gains to shareholders.  A portion of the Fund’s distributions generally will be subject to the federal alternative minimum tax.  The Fund may not be suitable for investors subject to the federal alternative minimum tax.

Principal Risks

Municipal Bond Risk.  The amount of public information available about municipal bonds is generally less than for corporate equities or bonds, meaning that the investment performance of municipal bond investments may be more dependent on the analytical abilities of the investment adviser than stock or corporate bond investments. The secondary market for municipal bonds also tends to be less well-developed and less liquid than many other securities markets, which may limit an owner’s ability to sell its bonds at attractive prices.  The spread between the price at which an obligation can be purchased and the price at which it can be sold may widen during periods of market distress.  Less liquid obligations can become more difficult to value and be subject to erratic price movements.  The increased presence of non-traditional participants or the absence of traditional participants in the municipal markets may lead to greater volatility in the markets.

Debt Market Risk.  Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted.  Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand.  At other times, the demand for such instruments may exceed the supply in the market.  An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market.  No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments.

Interest Rate Risk. As interest rates rise, the value of Fund shares is likely to decline.  Conversely, when interest rates decline, the value of Fund shares is likely to rise.  Obligations with longer maturities generally offer higher yields, but involve greater risk because the prices of such obligations are more sensitive to changes in interest rates than obligations with shorter maturities.  In a declining interest rate environment, prepayments of obligations may increase if the issuer has the ability to pre-pay or “call” the obligation.  In such circumstances, the Fund may have to reinvest the prepayment proceeds at lower yields.  Because the Fund is managed toward an income objective, it may hold more longer-maturity obligations and thereby be more exposed to interest rate risk than municipal income funds that are managed with a greater emphasis on total return.

Credit Risk.  Changes in economic conditions or other circumstances may reduce the capacity of issuers of fixed income securities to make principal and interest payments and may lead to defaults. Such defaults may reduce the value of Fund shares and income distributions.  The value of a fixed income security also may decline because of real or perceived concerns about the issuer’s ability to make principal and interest payments.  In addition, the credit rating of securities held by the Fund may be lowered if an issuer’s financial condition changes.  Municipal obligations may be insured as to principal and interest payments.  If the claims-paying ability or other rating of the insurer is downgraded by a rating agency, the value of such obligations may be negatively affected.  In the case of an insured bond, the bond’s rating will be deemed to be the higher of the rating assigned to the bond’s issuer or the insurer.

Risk of Lower Rated Investments.   Investments rated below investment grade and comparable unrated securities (“junk bonds”) have speculative characteristics because of the credit risk associated with their issuers.  Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments.  An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs.  Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk.   The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints.  Derivatives may create economic leverage in the Fund, which magnifies the Fund’s exposure to the underlying investment. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund.  When derivatives are used to gain or limit exposure to a particular market or market segment, their performance may not correlate as expected to the performance of such market thereby causing the Fund to fail to achieve its original purpose for using such derivatives. A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Derivative instruments may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment.

Risk of Leveraged Transactions.  Certain Fund transactions may give rise to a form of leverage.  Such transactions may include, among others, the use of when-issued, delayed delivery or forward commitment transactions, residual interest bonds, short sales and certain derivative transactions.  The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage.  The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.  Leverage may cause the Fund to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.  The loss on leveraged transactions may substantially exceed the initial investment.

Risk of Residual Interest Bonds.   The Fund may enter into residual interest bond transactions, which expose the Fund to leverage and greater risk than an investment in a fixed-rate municipal bond.  The interest payments that the Fund receives on the residual interest bonds acquired in such transactions vary inversely with short-term interest rates, normally decreasing when short-term rates increase.  The value and market for residual interest bonds are volatile and such bonds may have limited liquidity.  As required by applicable accounting standards, the Fund records interest expense on its liability with respect to floating-rate notes and also records offsetting interest income in an amount equal to this expense.

Sector and Geographic Concentration Risk.  Because the Fund may concentrate its investments in obligations issued in a particular state and may concentrate in certain sectors or types of obligations, the value of Fund shares may be affected by events that adversely affect that state, sector or type of obligation and may fluctuate more than that of a less concentrated fund. Please refer to the Fund's Statement of Additional Information for state-specific economic information.

Risks of Principal Only Investments.  Principal only investments entitle the holder to receive par value of such investment if held to maturity.  The values of principal only investments are subject to greater fluctuation in response to changes in market interest rates than bonds which pay interest currently.  The Fund will accrue income on these investments and is required to distribute that income each year.  The Fund may be required to sell securities to obtain cash needed for such income distributions.

Issuer Diversification Risk. The Fund is “non-diversified” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

Tax Risk.  Income from tax-exempt municipal obligations could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, or state tax authorities or non-compliant conduct of a bond issuer. A portion of the Fund’s income may be taxable to shareholders subject to the federal alternative minimum tax.

Risks Associated with Active Management.  The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the investment adviser to develop and effectively implement strategies to achieve the Fund’s investment objective.  Subjective decisions made by the investment adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks.  The Fund is not a complete investment program and you may lose money by investing in the Fund.  All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective.  Annual Fund Operating Expenses expressed as a percentage of the Fund’s average daily net assets may change as Fund assets increase and decrease, and Annual Fund Operating Expenses may differ in the future.  Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective.  In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund.  Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.  Mutual funds, investment advisers, other market participants and many securities markets are subject to rules and regulations and the jurisdiction of one or more regulators.  Changes to applicable rules and regulations could have an adverse affect on securities markets and market participants, as well as on the Fund’s ability to execute its investment strategy.

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of two broad-based securities market indices.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.

During the ten years ended December 31, 2011, the highest quarterly total return for Class A was 12.85% for the quarter ended September 30, 2009, and the lowest quarterly return was –15.29% for the quarter ended December 31, 2008.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 2011 to September 30, 2012) was 10.32%.   For the 30 days ended July 31, 2012, the SEC yield and SEC tax-equivalent yield (assuming a combined state and federal income tax rate of 40.83%) for Class A shares were 2.86% and 4.83%, respectively, for Class C shares were 2.26% and 3.82%, respectively, and for Class I shares were 3.20% and 5.41%, respectively.  A lower tax rate would result in lower tax-equivalent yields.  For current yield information call 1-800-262-1122.

Average Annual Total Returns Eaton Vance New Jersey Municipal Income Fund	1 Year	5 Years	10 Years
Class A	4.28%	0.33%	3.31%
Class A After Taxes on Distributions	4.27%	0.32%	3.30%
Class A After Taxes on Distributions and Sales	4.46%	0.93%	3.51%
Class C	7.70%	0.57%	3.04%
Class I	9.81%	1.49%	3.90%
Barclays Capital Municipal Bond Index	10.70%	5.22%	5.37%
Barclays Capital 20 Year Municipal Bond Index	13.98%	5.27%	6.01%

These returns reflect the maximum sales charge for Class A (4.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class C.  The Class C performance shown above for the period prior to December 14, 2005 (commencement of operations) is the performance of Class B shares, which has since converted into another share class, adjusted for the sales charge that applies to Class C shares (but not adjusted for any other differences in the expenses of the two classes) and the Class I performance shown above for the period prior to March 3, 2008 (commencement of operations) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for other expenses, returns would be different.  Investors cannot invest directly in an Index.  

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant for shareholders who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.