0000880797 fsst4:S000007500Member fsst4:C000020474Member 2011-10-31 2012-10-30 0000880797 fsst4:S000007502Member fsst4:C000020476Member 2011-10-31 2012-10-30 0000880797 fsst4:S000007501Member 2011-10-31 2012-10-30 0000880797 fsst4:S000007500Member 2011-10-31 2012-10-30 0000880797 fsst4:S000007502Member 2011-10-31 2012-10-30 0000880797 fsst4:S000007501Member fsst4:C000020475Member 2011-10-31 2012-10-30 0000880797 2011-10-31 2012-10-30 pure iso4217:USD 2012-09-30 2012-09-30 <div style="display:none">~ http://www.fidelity.com/role/ScheduleShareholderFeesFidelityArizonaMunicipalMoneyMarketFund column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleShareholderFeesFidelityAMTTax-FreeMoneyFund column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleShareholderFeesFidelityMunicipalMoneyMarketFund column period compact * ~</div> 2012-09-30 280 0.0066 www.fidelity.com www.fidelity.com 241 0.0084 235 0.0072 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualFundOperatingExpensesFidelityArizonaMunicipalMoneyMarketFund column period compact * ~</div> Fund Summary Fund: Fidelity® Arizona Municipal Money Market Fund Shareholder fees (fees paid directly from your investment) The information illustrates the changes in the performance of the fund's shares from year to year. Fund Summary Fund: Fidelity® AMT Tax-Free Money Fund Shareholder fees (fees paid directly from your investment) The information illustrates the changes in the performance of the fund's shares from year to year. 0.0001 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualFundOperatingExpensesFidelityAMTTax-FreeMoneyFund column period compact * ~</div> Fund Summary Fund: Fidelity® Municipal Money Market Fund Shareholder fees (fees paid directly from your investment) www.fidelity.com The information illustrates the changes in the performance of the fund's shares from year to year. 0.0001 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualFundOperatingExpensesFidelityMunicipalMoneyMarketFund column period compact * ~</div> 0.0001 485BPOS FIDELITY UNION STREET TRUST II 2012-10-29 51 160 0.0116 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualTotalReturnsFidelityArizonaMunicipalMoneyMarketFundBarChart column period compact * ~</div> Annual fund operating expenses (expenses that you pay each year as a % of the value of your investment) Principal Investment Strategies Average Annual Returns For the periods ended December 31, 2011 <table border="1" width="95%"><tr><td><div align="left">During the periods shown in the chart: </div></td><td valign="bottom" align="center"><div align="center">Returns </div></td><td valign="bottom" align="center"><div align="center">Quarter ended</div></td></tr><tr><td><div align="left">Highest Quarter Return </div></td><td><div align="right">0.83% </div></td><td><div align="left">June 30, 2007</div></td></tr><tr><td><div align="left">Lowest Quarter Return </div></td><td><div align="right">0.00% </div></td><td><div align="left">March 31, 2011</div></td></tr><tr><td><div align="left">Year-to-Date Return </div></td><td><div align="right">0.01% </div></td><td><div align="left">September 30, 2012</div></td></tr></table> The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund. 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: Annual fund operating expenses (expenses that you pay each year as a % of the value of your investment) Principal Investment Strategies Average Annual Returns For the periods ended December 31, 2011 <table border="1" width="95%"><tr><td><div align="left">During the periods shown in the chart: </div></td><td valign="bottom" align="center"><div align="center">Returns </div></td><td valign="bottom" align="center"><div align="center">Quarter ended</div></td></tr><tr><td><div align="left">Highest Quarter Return </div></td><td><div align="right">0.87% </div></td><td><div align="left">June 30, 2007</div></td></tr><tr><td><div align="left">Lowest Quarter Return </div></td><td><div align="right">0.00% </div></td><td><div align="left">March 31, 2010</div></td></tr><tr><td><div align="left">Year-to-Date Return </div></td><td><div align="right">0.01% </div></td><td><div align="left">September 30, 2012</div></td></tr></table> The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund. 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: 44 138 0.0128 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualTotalReturnsFidelityAMTTax-FreeMoneyFundBarChart column period compact * ~</div> Annual fund operating expenses (expenses that you pay each year as a % of the value of your investment) Principal Investment Strategies Average Annual Returns For the periods ended December 31, 2011 <table border="1" width="95%"><tr><td><div align="left">During the periods shown in the chart: </div></td><td valign="bottom" align="center"><div align="center">Returns </div></td><td valign="bottom" align="center"><div align="center">Quarter ended</div></td></tr><tr><td><div align="left">Highest Quarter Return </div></td><td><div align="right">0.85% </div></td><td><div align="left">June 30, 2007</div></td></tr><tr><td><div align="left">Lowest Quarter Return </div></td><td><div align="right">0.00% </div></td><td><div align="left">March 31, 2011</div></td></tr><tr><td><div align="left">Year-to-Date Return </div></td><td><div align="right">0.01% </div></td><td><div align="left">September 30, 2012</div></td></tr></table> The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund. 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: 43 0.0118 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualTotalReturnsFidelityMunicipalMoneyMarketFundBarChart column period compact * ~</div> 2012-08-31 0000880797 2012-10-30 0 0.005 0.0202 0.0175 0.0008 0.0001 0.0001 0.0127 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAverageAnnualTotalReturnsTransposedFidelityArizonaMunicipalMoneyMarketFund column period compact * ~</div> Investment Objective Fee Table <ul><li>Normally investing in municipal money market securities.</li><li>Normally investing at least 80% of assets in municipal securities whose interest is exempt from federal and Arizona personal income taxes.</li><li>Potentially investing up to 20% of assets in municipal securities whose interest is subject to Arizona personal income tax.</li><li>Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects. </li><li>Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, and diversification of investments.</li></ul> Year-by-Year Returns Calendar Years <ul><li>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.</li><li>Interest Rate Changes. Interest rate increases can cause the price of a money market security to decrease.</li><li>Foreign Exposure. Entities providing credit support or a maturity-shortening structure that are located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries.</li><li>Geographic Concentration. Unfavorable political or economic conditions within Arizona can affect the credit quality of issuers located in that state.</li><li>Issuer-Specific Changes. 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 money market security to decrease.</li></ul>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. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund. false Investment Objective Fee Table <ul><li>Normally investing in municipal money market securities.</li><li>Normally investing at least 80% of assets in municipal securities whose interest is exempt from federal income tax.</li><li>Normally not investing in municipal securities whose interest is subject to the federal alternative minimum tax.</li><li>Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects. </li><li>Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, and diversification of investments.</li></ul> Year-by-Year Returns Calendar Years <ul><li>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.</li><li>Interest Rate Changes. Interest rate increases can cause the price of a money market security to decrease.</li><li>Foreign Exposure. Entities providing credit support or a maturity-shortening structure that are located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries.</li><li>Issuer-Specific Changes. 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 money market security to decrease.</li></ul>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. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund. 0 0 0.0043 0.0218 0.0187 0.002 0.0001 0.0001 0.0139 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAverageAnnualTotalReturnsTransposedFidelityAMTTax-FreeMoneyFund column period compact * ~</div> Investment Objective Fee Table <ul><li>Normally investing in municipal money market securities.</li><li>Normally investing at least 80% of assets in municipal securities whose interest is exempt from federal income tax.</li><li>Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects.</li><li>Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, and diversification of investments.</li></ul> Year-by-Year Returns Calendar Years <ul><li>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.</li><li>Interest Rate Changes. Interest rate increases can cause the price of a money market security to decrease.</li><li>Foreign Exposure. Entities providing credit support or a maturity-shortening structure that are located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries.</li><li>Issuer-Specific Changes. 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 money market security to decrease.</li></ul>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. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund. 0 0 0.0042 135 0.0207 0.0191 0.0001 0.0001 0.0133 2007-06-30 0.0085 Lowest Quarter Return 2011-03-31 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAverageAnnualTotalReturnsTransposedFidelityMunicipalMoneyMarketFund column period compact * ~</div> 0 Fidelity Arizona Municipal Income Fund 2007-06-30 0.0083 Lowest Quarter Return 2011-03-31 2007-06-30 0.0087 Lowest Quarter Return 2010-03-31 Fidelity AMT Tax-Free Money Fund</b Fidelity Municipal Money Market Fund 2012-10-30 0.005 0 628 0.0078 0.0305 0.0326 0.0001 0.0101 <div style="display:none">~ http://www.fidelity.com/role/ScheduleExpenseExampleFidelityArizonaMunicipalMoneyMarketFund column period compact * ~</div> Principal Investment Risks Performance The fund seeks as high a level of current income exempt from federal income tax and Arizona personal income tax, as is consistent with preservation of capital. 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. Past performance is not an indication of future performance. Visit www.fidelity.com for updated return information. 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. Past performance is not an indication of future performance. Principal Investment Risks Performance The fund seeks as high a level of federally tax-exempt income as is consistent with the preservation of capital and liquidity. 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. Past performance is not an indication of future performance. Visit www.fidelity.com for updated return information. 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. Past performance is not an indication of future performance. Year-to-Date Return 0.0043 0 542 0.0097 0.032 0.0343 0.0002 0.011 <div style="display:none">~ http://www.fidelity.com/role/ScheduleExpenseExampleFidelityAMTTaxFreeMoneyFund column period compact * ~</div> Principal Investment Risks Performance The fund seeks as high a level of interest income exempt from federal income tax as is consistent with liquidity and stability of principal. 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. Past performance is not an indication of future performance. Visit www.fidelity.com for updated return information. 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. Past performance is not an indication of future performance. 0.0027 0.0015 530 0.0086 0.0312 0.0334 0.0017 0.0001 0.0108 Year-to-Date Return Highest Quarter Return 0 <div style="display:none">~ http://www.fidelity.com/role/ScheduleExpenseExampleFidelityMunicipalMoneyMarketFund column period compact * ~</div> Year-to-Date Return Highest Quarter Return 0 Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund. Highest Quarter Return 0 Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.