485BPOS

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM N-1A
REGISTRATION STATEMENT (No. 002-50318)
		UNDER THE SECURITIES ACT OF 1933	[X]
		Pre-Effective Amendment No. ____	[ ]
		Post-Effective Amendment No. 119	[X]
and
REGISTRATION STATEMENT (No. 811-02460)
		UNDER THE INVESTMENT COMPANY ACT OF 1940	[X]
		Amendment No. 119	[X]
Fidelity Union Street Trust
(Exact Name of Registrant as Specified in Charter)
82 Devonshire St., Boston, Massachusetts 02109
(Address Of Principal Executive Offices) (Zip Code)
Registrant's Telephone Number: 617-563-7000
Scott C. Goebel, Secretary
82 Devonshire Street
Boston, Massachusetts 02109
(Name and Address of Agent for Service)
It is proposed that this filing will become effective
	(x)	immediately upon filing pursuant to paragraph (b).
	( )	on ( ) pursuant to paragraph (b) at 5:30 p.m. Eastern Time.
	( )	60 days after filing pursuant to paragraph (a)(1) at 5:30 p.m. Eastern Time.
	( )	on ( ) pursuant to paragraph (a)(1) of Rule 485 at 5:30 p.m. Eastern Time.
	( )	75 days after filing pursuant to paragraph (a)(2) at 5:30 p.m. Eastern Time.
	( )	on ( ) pursuant to paragraph (a)(2) of Rule 485 at 5:30 p.m. Eastern Time.
If appropriate, check the following box:
	( )	this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

EXHIBIT INDEX

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

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 the effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-Effective Amendment No. 119 to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Boston, and Commonwealth of Massachusetts, on the 15th day of November 2012.

	Fidelity Union Street Trust
	By	/s/John R. Hebble
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||		John R. Hebble, President

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

(Signature)		(Title)	(Date)
/s/John R. Hebble		President and Treasurer	November 15, 2012
John R. Hebble		(Principal Executive Officer)
/s/Christine Reynolds		Chief Financial Officer	November 15, 2012
Christine Reynolds		(Principal Financial Officer)
/s/Abigail P. Johnson		Trustee	November 15, 2012
Abigail P. Johnson
/s/James C. Curvey	*	Trustee	November 15, 2012
James C. Curvey
/s/Albert R. Gamper	*	Trustee	November 15, 2012
Albert R. Gamper
/s/Robert F. Gartland	*	Trustee	November 15, 2012
Robert F. Gartland
/s/Arthur E. Johnson	*	Trustee	November 15, 2012
Arthur E. Johnson
/s/Michael E. Kenneally	*	Trustee	November 15, 2012
Michael E. Kenneally
/s/James H. Keyes	*	Trustee	November 15, 2012
James H. Keyes
/s/Marie L. Knowles	*	Trustee	November 15, 2012
Marie L. Knowles
/s/Kenneth L. Wolfe	*	Trustee	November 15, 2012
Kenneth L. Wolfe

*	By:	/s/Joseph R. Fleming
		Joseph R. Fleming, pursuant to a power of attorney dated February 1, 2011 and filed herewith.

POWER OF ATTORNEY

We, the undersigned Directors or Trustees, as the case may be, of the following investment companies:

  Fidelity Aberdeen Street Trust Fidelity Advisor Series II Fidelity Advisor Series IV Fidelity Boylston Street Trust Fidelity California Municipal Trust Fidelity California Municipal Trust II Fidelity Central Investment Portfolios II LLC Fidelity Charles Street Trust Fidelity Colchester Street Trust Fidelity Court Street Trust Fidelity Court Street Trust II Fidelity Fixed-Income Trust Fidelity Garrison Street Trust Fidelity Hereford Street Trust Fidelity Income Fund   Fidelity Massachusetts Municipal Trust Fidelity Money Market Trust Fidelity Municipal Trust Fidelity Municipal Trust II Fidelity Newbury Street Trust Fidelity New York Municipal Trust Fidelity New York Municipal Trust II Fidelity Oxford Street Trust Fidelity Phillips Street Trust Fidelity Revere Street Trust Fidelity School Street Trust Fidelity Union Street Trust Fidelity Union Street Trust II Variable Insurance Products Fund V

in addition to any other investment company for which Fidelity Management & Research Company ("FMR") or an affiliate acts as investment adviser and for which the undersigned individuals serve as Directors or Trustees (collectively, the "Funds"), hereby revoke all previous powers of attorney we have given to sign and otherwise act in our names and behalf in matters involving any investment company for which FMR or an affiliate acts as investment adviser and hereby constitute and appoint Thomas C. Bogle, Joseph R. Fleming, John V. O'Hanlon, Robert W. Helm and Anthony H. Zacharski, each of them singly, our true and lawful attorneys-in-fact, with full power of substitution, and with full power to each of them, to sign for us and in our names in the appropriate capacities, all Registration Statements of the Funds on Form N-1A, or any successors thereto, any and all subsequent Amendments, Pre-Effective Amendments, or Post-Effective Amendments to said Registration Statements or any successors thereto, and any supplements or other instruments in connection therewith, and generally to do all such things in our names and behalf in connection therewith as said attorneys-in-fact deem necessary or appropriate, to comply with the provisions of the Securities Act of 1933 and the Investment Company Act of 1940, and all related requirements of the Securities and Exchange Commission. We hereby ratify and confirm all that said attorneys-in-fact or their substitutes may do or cause to be done by virtue hereof. This power of attorney is effective for all documents filed on or after February 1, 2011.

WITNESS our hands on this first day of February 1, 2011.

/s/James C. Curvey	/s/Michael E. Kenneally
James C. Curvey	Michael E. Kenneally
/s/Albert R. Gamper, Jr.	/s/James H. Keyes
Albert R. Gamper, Jr.	James H. Keyes
/s/Robert F. Gartland	/s/Marie L. Knowles
Robert F. Gartland	Marie L. Knowles
/s/Arthur E. Johnson	/s/Kenneth L. Wolfe
Arthur E. Johnson	Kenneth L. Wolfe

XML

Fidelity Maryland Municipal Income Fund

Fund Summary

Fund:
Fidelity^® Maryland Municipal Income Fund

Investment Objective

The fund seeks a high level of current income exempt from federal income tax and Maryland personal income taxes.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy, hold, or sell shares of the fund.

Shareholder fees
(fees paid directly from your investment)

Shareholder Fees	Fidelity Maryland Municipal Income Fund Class: Fidelity Maryland Municipal Income Fund
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.50%

Annual fund operating expenses
(expenses that you pay each year as a % of the value of your investment)

Annual Fund Operating Expenses	Fidelity Maryland Municipal Income Fund Class: Fidelity Maryland Municipal Income Fund
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	none
Total annual fund operating expenses	0.55%

This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example (USD $)	Fidelity Maryland Municipal Income Fund Class: Fidelity Maryland Municipal Income Fund
1 year	56
3 years	176
5 years	307
10 years	689

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 10% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing at least 80% of assets in investment-grade municipal securities whose interest is exempt from federal and Maryland personal income taxes.
• Managing the fund to have similar overall interest rate risk to an index designed to represent Fidelity Management & Research Company (FMR)'s view of how the fund's competitive universe will perform over time.
• Allocating assets across different market sectors and maturities.
• Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects.
• Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.

Principal Investment Risks

• Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities.
• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
• Geographic Concentration. Unfavorable political or economic conditions within Maryland can affect the credit quality of issuers located in that state.
• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Information about the Indexes section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for updated return information.

Year-by-Year Returns
Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	5.96%	September 30, 2009
Lowest Quarter Return	-3.37%	December 31, 2010
Year-to-Date Return	5.17%	September 30, 2012

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances.

For the periods ended
December 31, 2011

Average Annual Total Returns Fidelity Maryland Municipal Income Fund	Past 1 year	Past 5 years	Past 10 years
Class: Fidelity Maryland Municipal Income Fund Return Before Taxes	8.91%	4.63%	4.74%
Class: Fidelity Maryland Municipal Income Fund Return After Taxes on Distributions	8.91%	4.62%	4.72%
Class: Fidelity Maryland Municipal Income Fund Return After Taxes on Distributions and Sale of Fund Shares	6.99%	4.47%	4.61%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.70%	5.22%	5.38%
Barclays Maryland 4+ Year Enhanced Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.62%	5.74%	5.63%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY UNION STREET TRUST

Prospectus Date

rr_ProspectusDate

Oct. 30, 2012

Fidelity Arizona Municipal Income Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Fidelity^® Arizona Municipal Income Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks a high level of current income, exempt from federal income tax and Arizona personal income tax.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy, hold, or sell shares of the fund.

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 % 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" its 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 12% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

12.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing at least 80% of assets in investment-grade municipal securities whose interest is exempt from federal and Arizona personal income taxes.
• Managing the fund to have similar overall interest rate risk to an index designed to represent Fidelity Management & Research Company (FMR)'s view of how the fund's competitive universe will perform over time.
• Allocating assets across different market sectors and maturities.
• Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects.
• Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities.
• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
• Geographic Concentration. Unfavorable political or economic conditions within Arizona can affect the credit quality of issuers located in that state.
• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Information about the Indexes section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for updated return information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns
Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	6.69%	September 30, 2009
Lowest Quarter Return	-4.08%	December 31, 2010
Year-to-Date Return	6.38%	September 30, 2012

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances.

For the periods ended
December 31, 2011

Fidelity Arizona Municipal Income Fund | Class: Fidelity Arizona Municipal Income Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.50%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

none

Total annual fund operating expenses

rr_ExpensesOverAssets

0.55%

1 year

rr_ExpenseExampleYear01

56

3 years

rr_ExpenseExampleYear03

176

5 years

rr_ExpenseExampleYear05

307

10 years

rr_ExpenseExampleYear10

689

2002

rr_AnnualReturn2002

9.93%

2003

rr_AnnualReturn2003

5.22%

2004

rr_AnnualReturn2004

3.73%

2005

rr_AnnualReturn2005

2.70%

2006

rr_AnnualReturn2006

4.43%

2007

rr_AnnualReturn2007

2.57%

2008

rr_AnnualReturn2008

(4.21%)

2009

rr_AnnualReturn2009

13.65%

2010

rr_AnnualReturn2010

2.33%

2011

rr_AnnualReturn2011

9.94%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

6.38%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

6.69%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2010

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(4.08%)

Fidelity Arizona Municipal Income Fund | Return Before Taxes | Class: Fidelity Arizona Municipal Income Fund

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Arizona Municipal Income Fund

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

9.94%

Past 5 years

rr_AverageAnnualReturnYear05

4.66%

Past 10 years

rr_AverageAnnualReturnYear10

4.92%

Fidelity Arizona Municipal Income Fund | Return After Taxes on Distributions | Class: Fidelity Arizona Municipal Income Fund

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Arizona Municipal Income Fund

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

9.93%

Past 5 years

rr_AverageAnnualReturnYear05

4.64%

Past 10 years

rr_AverageAnnualReturnYear10

4.85%

Fidelity Arizona Municipal Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class: Fidelity Arizona Municipal Income Fund

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Arizona Municipal Income Fund

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

7.80%

Past 5 years

rr_AverageAnnualReturnYear05

4.52%

Past 10 years

rr_AverageAnnualReturnYear10

4.75%

Fidelity Arizona Municipal Income Fund | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Label

rr_AverageAnnualReturnLabel

Barclays^® Municipal Bond Index

Past 1 year

rr_AverageAnnualReturnYear01

10.70%

Past 5 years

rr_AverageAnnualReturnYear05

5.22%

Past 10 years

rr_AverageAnnualReturnYear10

5.38%

Fidelity Arizona Municipal Income Fund | Barclays Arizona 4+ Year Enhanced Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Label

rr_AverageAnnualReturnLabel

Barclays Arizona 4+ Year Enhanced Municipal Bond Index

Past 1 year

rr_AverageAnnualReturnYear01

11.23%

Past 5 years

rr_AverageAnnualReturnYear05

5.67%

Past 10 years

rr_AverageAnnualReturnYear10

5.62%

XML

Fidelity Arizona Municipal Income Fund

Fund Summary

Fund:
Fidelity^® Arizona Municipal Income Fund

Investment Objective

The fund seeks a high level of current income, exempt from federal income tax and Arizona personal income tax.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy, hold, or sell shares of the fund.

Shareholder fees
(fees paid directly from your investment)

Shareholder Fees	Fidelity Arizona Municipal Income Fund Class: Fidelity Arizona Municipal Income Fund
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.50%

Annual fund operating expenses
(expenses that you pay each year as a % of the value of your investment)

Annual Fund Operating Expenses	Fidelity Arizona Municipal Income Fund Class: Fidelity Arizona Municipal Income Fund
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	none
Total annual fund operating expenses	0.55%

This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example (USD $)	Fidelity Arizona Municipal Income Fund Class: Fidelity Arizona Municipal Income Fund
1 year	56
3 years	176
5 years	307
10 years	689

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 12% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing at least 80% of assets in investment-grade municipal securities whose interest is exempt from federal and Arizona personal income taxes.
• Managing the fund to have similar overall interest rate risk to an index designed to represent Fidelity Management & Research Company (FMR)'s view of how the fund's competitive universe will perform over time.
• Allocating assets across different market sectors and maturities.
• Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects.
• Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.

Principal Investment Risks

• Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities.
• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
• Geographic Concentration. Unfavorable political or economic conditions within Arizona can affect the credit quality of issuers located in that state.
• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Information about the Indexes section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for updated return information.

Year-by-Year Returns
Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	6.69%	September 30, 2009
Lowest Quarter Return	-4.08%	December 31, 2010
Year-to-Date Return	6.38%	September 30, 2012

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances.

For the periods ended
December 31, 2011

Average Annual Total Returns Fidelity Arizona Municipal Income Fund	Past 1 year	Past 5 years	Past 10 years
Class: Fidelity Arizona Municipal Income Fund Return Before Taxes	9.94%	4.66%	4.92%
Class: Fidelity Arizona Municipal Income Fund Return After Taxes on Distributions	9.93%	4.64%	4.85%
Class: Fidelity Arizona Municipal Income Fund Return After Taxes on Distributions and Sale of Fund Shares	7.80%	4.52%	4.75%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.70%	5.22%	5.38%
Barclays Arizona 4+ Year Enhanced Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	11.23%	5.67%	5.62%

XML

Document and Entity Information	12 Months Ended
	Oct. 30, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Aug. 31, 2012
Registrant Name	FIDELITY UNION STREET TRUST
Central Index Key	0000035330
Amendment Flag	false
Document Creation Date	Oct. 29, 2012
Document Effective Date	Oct. 30, 2012
Prospectus Date	Oct. 30, 2012

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY UNION STREET TRUST

Prospectus Date

rr_ProspectusDate

Oct. 30, 2012

Fidelity Maryland Municipal Income Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Fidelity^® Maryland Municipal Income Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks a high level of current income exempt from federal income tax and Maryland personal income taxes.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy, hold, or sell shares of the fund.

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 % 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" its 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 10% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

10.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing at least 80% of assets in investment-grade municipal securities whose interest is exempt from federal and Maryland personal income taxes.
• Managing the fund to have similar overall interest rate risk to an index designed to represent Fidelity Management & Research Company (FMR)'s view of how the fund's competitive universe will perform over time.
• Allocating assets across different market sectors and maturities.
• Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects.
• Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities.
• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
• Geographic Concentration. Unfavorable political or economic conditions within Maryland can affect the credit quality of issuers located in that state.
• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Information about the Indexes section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for updated return information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns
Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	5.96%	September 30, 2009
Lowest Quarter Return	-3.37%	December 31, 2010
Year-to-Date Return	5.17%	September 30, 2012

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances.

For the periods ended
December 31, 2011

Fidelity Maryland Municipal Income Fund | Class: Fidelity Maryland Municipal Income Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.50%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

none

Total annual fund operating expenses

rr_ExpensesOverAssets

0.55%

1 year

rr_ExpenseExampleYear01

56

3 years

rr_ExpenseExampleYear03

176

5 years

rr_ExpenseExampleYear05

307

10 years

rr_ExpenseExampleYear10

689

2002

rr_AnnualReturn2002

8.64%

2003

rr_AnnualReturn2003

5.02%

2004

rr_AnnualReturn2004

4.06%

2005

rr_AnnualReturn2005

2.55%

2006

rr_AnnualReturn2006

4.14%

2007

rr_AnnualReturn2007

3.04%

2008

rr_AnnualReturn2008

(3.98%)

2009

rr_AnnualReturn2009

13.78%

2010

rr_AnnualReturn2010

2.27%

2011

rr_AnnualReturn2011

8.91%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

5.17%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

5.96%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2010

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.37%)

Fidelity Maryland Municipal Income Fund | Return Before Taxes | Class: Fidelity Maryland Municipal Income Fund

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Maryland Municipal Income Fund

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

8.91%

Past 5 years

rr_AverageAnnualReturnYear05

4.63%

Past 10 years

rr_AverageAnnualReturnYear10

4.74%

Fidelity Maryland Municipal Income Fund | Return After Taxes on Distributions | Class: Fidelity Maryland Municipal Income Fund

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Maryland Municipal Income Fund

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

8.91%

Past 5 years

rr_AverageAnnualReturnYear05

4.62%

Past 10 years

rr_AverageAnnualReturnYear10

4.72%

Fidelity Maryland Municipal Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class: Fidelity Maryland Municipal Income Fund

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Maryland Municipal Income Fund

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

6.99%

Past 5 years

rr_AverageAnnualReturnYear05

4.47%

Past 10 years

rr_AverageAnnualReturnYear10

4.61%

Fidelity Maryland Municipal Income Fund | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Label

rr_AverageAnnualReturnLabel

Barclays^® Municipal Bond Index

Past 1 year

rr_AverageAnnualReturnYear01

10.70%

Past 5 years

rr_AverageAnnualReturnYear05

5.22%

Past 10 years

rr_AverageAnnualReturnYear10

5.38%

Fidelity Maryland Municipal Income Fund | Barclays Maryland 4+ Year Enhanced Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Label

rr_AverageAnnualReturnLabel

Barclays Maryland 4+ Year Enhanced Municipal Bond Index

Past 1 year

rr_AverageAnnualReturnYear01

10.62%

Past 5 years

rr_AverageAnnualReturnYear05

5.74%

Past 10 years

rr_AverageAnnualReturnYear10

5.63%

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FIDELITY UNION STREET TRUST
Prospectus Date	rr_ProspectusDate	Oct. 30, 2012
Document Creation Date	dei_DocumentCreationDate	Oct. 29, 2012