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SIGNATURE JOHN H. COSTELLO
TITLE ASSISTANT TREASURER
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<SHARES-COMMON-STOCK>
847,470
<SHARES-COMMON-PRIOR>
773,324
<ACCUMULATED-NII-CURRENT>
0
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(137)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
<NET-ASSETS>
847,333
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
44,412
<OTHER-INCOME>
0
<EXPENSES-NET>
3,698
<NET-INVESTMENT-INCOME>
40,714
<REALIZED-GAINS-CURRENT>
15
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
40,729
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
40,714
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
839,208
<NUMBER-OF-SHARES-REDEEMED>
803,544
<SHARES-REINVESTED>
38,482
<NET-CHANGE-IN-ASSETS>
74,162
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(152)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
3,739
<INTEREST-EXPENSE>
0
<GROSS-EXPENSE>
3,740
<AVERAGE-NET-ASSETS>
831,450
<PER-SHARE-NAV-BEGIN>
1.000
<PER-SHARE-NII>
.049
<PER-SHARE-GAIN-APPREC>
0
<PER-SHARE-DIVIDEND>
.049
<PER-SHARE-DISTRIBUTIONS>
0
<RETURNS-OF-CAPITAL>
0
<PER-SHARE-NAV-END>
1.000
<EXPENSE-RATIO>
45
</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-30-1999
<PERIOD-END>
APR-30-1999
<INVESTMENTS-AT-COST>
2,057,852
<INVESTMENTS-AT-VALUE>
2,057,852
<RECEIVABLES>
39,820
<ASSETS-OTHER>
0
<OTHER-ITEMS-ASSETS>
0
<TOTAL-ASSETS>
2,097,672
<PAYABLE-FOR-SECURITIES>
0
<SENIOR-LONG-TERM-DEBT>
0
<OTHER-ITEMS-LIABILITIES>
7,938
<TOTAL-LIABILITIES>
7,938
<SENIOR-EQUITY>
0
<PAID-IN-CAPITAL-COMMON>
2,089,829
<SHARES-COMMON-STOCK>
2,089,698
<SHARES-COMMON-PRIOR>
1,912,459
<ACCUMULATED-NII-CURRENT>
0
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(95)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
<NET-ASSETS>
2,089,734
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
103,326
<OTHER-INCOME>
0
<EXPENSES-NET>
9,460
<NET-INVESTMENT-INCOME>
93,866
<REALIZED-GAINS-CURRENT>
(23)
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
93,843
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
93,866
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
2,111,263
<NUMBER-OF-SHARES-REDEEMED>
2,022,494
<SHARES-REINVESTED>
88,470
<NET-CHANGE-IN-ASSETS>
177,216
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(72)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
9,240
<INTEREST-EXPENSE>
322
<GROSS-EXPENSE>
9,570
<AVERAGE-NET-ASSETS>
2,054,979
<PER-SHARE-NAV-BEGIN>
1.000
<PER-SHARE-NII>
.046
<PER-SHARE-GAIN-APPREC>
0
<PER-SHARE-DIVIDEND>
.046
<PER-SHARE-DISTRIBUTIONS>
0
<RETURNS-OF-CAPITAL>
0
<PER-SHARE-NAV-END>
1.000
<EXPENSE-RATIO>
47
</TABLE>
