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        <adviserName>FIDELITY MANAGEMENT &amp; RESEARCH (HONG KONG) LIMITED</adviserName>
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    <scheduleOfPortfolioSecuritiesInfo>
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    <scheduleOfPortfolioSecuritiesInfo>
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    <scheduleOfPortfolioSecuritiesInfo>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 1.86%</titleOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 1.87% to 1.88%</titleOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 1.92%</titleOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 1.94%</titleOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 1.97%</titleOfIssuer>
      <CUSIPMember>912796SS9</CUSIPMember>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 2.05%</titleOfIssuer>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 2.06% to 2.15%</titleOfIssuer>
      <CUSIPMember>912796RT8</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
      <ISINId>US912796RT85</ISINId>
      <investmentCategory>U.S. Treasury Debt</investmentCategory>
      <securityEligibilityFlag>Y</securityEligibilityFlag>
      <NRSRO>
        <nameOfNRSRO>N/A</nameOfNRSRO>
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      <investmentMaturityDateWAL>2020-01-02</investmentMaturityDateWAL>
      <finalLegalInvestmentMaturityDate>2020-01-02</finalLegalInvestmentMaturityDate>
      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0156</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>52858504.31</includingValueOfAnySponsorSupport>
      <excludingValueOfAnySponsorSupport>52858504.31</excludingValueOfAnySponsorSupport>
      <percentageOfMoneyMarketFundNetAssets>0.0177</percentageOfMoneyMarketFundNetAssets>
      <securityCategorizedAtLevel3Flag>N</securityCategorizedAtLevel3Flag>
      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Bills</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Bills, 2.15%</titleOfIssuer>
      <CUSIPMember>912796SX8</CUSIPMember>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
      </NRSRO>
      <investmentMaturityDateWAM>2019-12-19</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2019-12-19</investmentMaturityDateWAL>
      <finalLegalInvestmentMaturityDate>2019-12-19</finalLegalInvestmentMaturityDate>
      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0143</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>29942593.20</includingValueOfAnySponsorSupport>
      <excludingValueOfAnySponsorSupport>29942593.20</excludingValueOfAnySponsorSupport>
      <percentageOfMoneyMarketFundNetAssets>0.0100</percentageOfMoneyMarketFundNetAssets>
      <securityCategorizedAtLevel3Flag>N</securityCategorizedAtLevel3Flag>
      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
    </scheduleOfPortfolioSecuritiesInfo>
    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.62%</titleOfIssuer>
      <CUSIPMember>912828X96</CUSIPMember>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
      </NRSRO>
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      <investmentMaturityDateWAL>2020-05-15</investmentMaturityDateWAL>
      <finalLegalInvestmentMaturityDate>2020-05-15</finalLegalInvestmentMaturityDate>
      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0159</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>71966250.00</includingValueOfAnySponsorSupport>
      <excludingValueOfAnySponsorSupport>71966250.00</excludingValueOfAnySponsorSupport>
      <percentageOfMoneyMarketFundNetAssets>0.0241</percentageOfMoneyMarketFundNetAssets>
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      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.64%</titleOfIssuer>
      <CUSIPMember>9128283T5</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
      </NRSRO>
      <investmentMaturityDateWAM>2019-11-01</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2020-01-31</investmentMaturityDateWAL>
      <finalLegalInvestmentMaturityDate>2020-01-31</finalLegalInvestmentMaturityDate>
      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0173</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>98975027.25</includingValueOfAnySponsorSupport>
      <excludingValueOfAnySponsorSupport>98975027.25</excludingValueOfAnySponsorSupport>
      <percentageOfMoneyMarketFundNetAssets>0.0332</percentageOfMoneyMarketFundNetAssets>
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      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.67%</titleOfIssuer>
      <CUSIPMember>9128284K3</CUSIPMember>
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      <ISINId>US9128284K35</ISINId>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
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      <investmentMaturityDateWAM>2019-11-01</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2020-04-30</investmentMaturityDateWAL>
      <finalLegalInvestmentMaturityDate>2020-04-30</finalLegalInvestmentMaturityDate>
      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0178</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>28508694.31</includingValueOfAnySponsorSupport>
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      <percentageOfMoneyMarketFundNetAssets>0.0096</percentageOfMoneyMarketFundNetAssets>
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      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.68%</titleOfIssuer>
      <CUSIPMember>912828Y53</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
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      <investmentMaturityDateWAM>2019-11-01</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2020-07-31</investmentMaturityDateWAL>
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      <securityDemandFeatureFlag>N</securityDemandFeatureFlag>
      <securityGuaranteeFlag>N</securityGuaranteeFlag>
      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0180</yieldOfTheSecurityAsOfReportingDate>
      <includingValueOfAnySponsorSupport>75933113.92</includingValueOfAnySponsorSupport>
      <excludingValueOfAnySponsorSupport>75933113.92</excludingValueOfAnySponsorSupport>
      <percentageOfMoneyMarketFundNetAssets>0.0255</percentageOfMoneyMarketFundNetAssets>
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      <dailyLiquidAssetSecurityFlag>Y</dailyLiquidAssetSecurityFlag>
      <weeklyLiquidAssetSecurityFlag>Y</weeklyLiquidAssetSecurityFlag>
      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.78%</titleOfIssuer>
      <CUSIPMember>9128286Q8</CUSIPMember>
      <LEIID>254900HROIFWPRGM1V77</LEIID>
      <ISINId>US9128286Q86</ISINId>
      <investmentCategory>U.S. Treasury Debt</investmentCategory>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
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      <investmentMaturityDateWAM>2019-11-01</investmentMaturityDateWAM>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
      <yieldOfTheSecurityAsOfReportingDate>0.0186</yieldOfTheSecurityAsOfReportingDate>
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      <percentageOfMoneyMarketFundNetAssets>0.0181</percentageOfMoneyMarketFundNetAssets>
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      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 1.86%</titleOfIssuer>
      <CUSIPMember>9128287G9</CUSIPMember>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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      <securityEnhancementsFlag>N</securityEnhancementsFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
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      <CUSIPMember>9128283N8</CUSIPMember>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
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      <investmentMaturityDateWAM>2019-12-31</investmentMaturityDateWAM>
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      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <scheduleOfPortfolioSecuritiesInfo>
      <nameOfIssuer>U.S. Treasury Notes</nameOfIssuer>
      <titleOfIssuer>U.S. Treasury Notes, 2.35%</titleOfIssuer>
      <CUSIPMember>912828LY4</CUSIPMember>
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      <investmentCategory>U.S. Treasury Debt</investmentCategory>
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        <nameOfNRSRO>N/A</nameOfNRSRO>
        <rating>N/A</rating>
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      <investmentMaturityDateWAM>2019-11-15</investmentMaturityDateWAM>
      <investmentMaturityDateWAL>2019-11-15</investmentMaturityDateWAL>
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      <illiquidSecurityFlag>N</illiquidSecurityFlag>
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    <signature>
      <registrant>Fidelity Hereford Street Trust: Fidelity Treasury Only Money Market Fund</registrant>
      <signatureDate>2019-11-05</signatureDate>
      <signature>Laura M. Del Prato</signature>
      <nameOfSigningOfficer>Laura M. Del Prato</nameOfSigningOfficer>
      <titleOfSigningOfficer>President and Treasurer</titleOfSigningOfficer>
    </signature>
  </formData>
</edgarSubmission>
