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<PAGE> PAGE 2
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<PAGE> PAGE 3
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 7
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<PAGE> PAGE 10
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<PAGE> PAGE 11
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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<PAGE> PAGE 14
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<PAGE> PAGE 15
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SIGNATURE JOHN H. COSTELLO
TITLE ASSISTANT TREASURER
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<TABLE> <S> <C>
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773,324
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0
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(152)
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0
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0
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773,172
<DIVIDEND-INCOME>
0
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45,075
<OTHER-INCOME>
0
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3,547
<NET-INVESTMENT-INCOME>
41,528
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10
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
41,538
<EQUALIZATION>
0
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41,528
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
967,378
<NUMBER-OF-SHARES-REDEEMED>
1,049,910
<SHARES-REINVESTED>
39,943
<NET-CHANGE-IN-ASSETS>
(42,579)
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(162)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
3,561
<INTEREST-EXPENSE>
0
<GROSS-EXPENSE>
3,565
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792,156
<PER-SHARE-NAV-BEGIN>
1.000
<PER-SHARE-NII>
.052
<PER-SHARE-GAIN-APPREC>
0
<PER-SHARE-DIVIDEND>
.052
<PER-SHARE-DISTRIBUTIONS>
0
<RETURNS-OF-CAPITAL>
0
<PER-SHARE-NAV-END>
1.000
<EXPENSE-RATIO>
45
<AVG-DEBT-OUTSTANDING>
0
<AVG-DEBT-PER-SHARE>
0
</TABLE>
<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-30-1998
<PERIOD-END>
APR-30-1998
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1,884,607
<INVESTMENTS-AT-VALUE>
1,884,607
<RECEIVABLES>
126,189
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0
<OTHER-ITEMS-ASSETS>
0
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2,010,796
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0
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0
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98,278
<TOTAL-LIABILITIES>
98,278
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0
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1,912,590
<SHARES-COMMON-STOCK>
1,912,459
<SHARES-COMMON-PRIOR>
1,911,043
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0
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(72)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
<NET-ASSETS>
1,912,518
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
102,409
<OTHER-INCOME>
0
<EXPENSES-NET>
8,642
<NET-INVESTMENT-INCOME>
93,767
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170
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
93,937
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
93,767
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
1,866,456
<NUMBER-OF-SHARES-REDEEMED>
1,955,761
<SHARES-REINVESTED>
90,721
<NET-CHANGE-IN-ASSETS>
1,586
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(111)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
8,504
<INTEREST-EXPENSE>
220
<GROSS-EXPENSE>
8,732
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1,891,400
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1.000
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.050
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0
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.050
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0
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0
<PER-SHARE-NAV-END>
1.000
<EXPENSE-RATIO>
46
<AVG-DEBT-OUTSTANDING>
0
<AVG-DEBT-PER-SHARE>
0
</TABLE>
