<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000917286
<NAME> Fidelity Hereford Street Trust
<SERIES>
<NUMBER> 31
<NAME> Spartan U.S. Treasury Money Market Fund
<MULTIPLIER> 1,000
<S>
<C>
<PERIOD-TYPE>
YEAR
<FISCAL-YEAR-END>
APR-30-2000
<PERIOD-END>
APR-30-2000
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1,795,299
<INVESTMENTS-AT-VALUE>
1,795,299
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276,874
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0
<OTHER-ITEMS-ASSETS>
0
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2,072,173
<PAYABLE-FOR-SECURITIES>
71,100
<SENIOR-LONG-TERM-DEBT>
0
<OTHER-ITEMS-LIABILITIES>
1,309
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72,409
<SENIOR-EQUITY>
0
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1,999,878
<SHARES-COMMON-STOCK>
1,999,747
<SHARES-COMMON-PRIOR>
2,089,698
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0
<OVERDISTRIBUTION-NII>
0
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(114)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
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1,999,764
<DIVIDEND-INCOME>
0
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106,088
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0
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9,224
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96,864
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(19)
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
96,845
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
96,864
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
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1,802,762
<NUMBER-OF-SHARES-REDEEMED>
1,982,838
<SHARES-REINVESTED>
90,125
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(89,970)
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0
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(95)
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0
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0
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9,272
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22
<GROSS-EXPENSE>
9,301
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2,061,761
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1.000
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.047
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0
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.047
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0
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0
<PER-SHARE-NAV-END>
1.000
<EXPENSE-RATIO>
45
</TABLE>
