<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000917286
<NAME> Fidelity Hereford Street Trust
<SERIES>
<NUMBER> 11
<NAME> Spartan Money Market Fund
<MULTIPLIER> 1,000
<S>
<C>
<PERIOD-TYPE>
6-MOS
<FISCAL-YEAR-END>
APR-30-2001
<PERIOD-END>
OCT-31-2000
<INVESTMENTS-AT-COST>
9,808,754
<INVESTMENTS-AT-VALUE>
9,808,754
<RECEIVABLES>
107,466
<ASSETS-OTHER>
0
<OTHER-ITEMS-ASSETS>
0
<TOTAL-ASSETS>
9,916,220
<PAYABLE-FOR-SECURITIES>
254,287
<SENIOR-LONG-TERM-DEBT>
0
<OTHER-ITEMS-LIABILITIES>
42,561
<TOTAL-LIABILITIES>
296,848
<SENIOR-EQUITY>
0
<PAID-IN-CAPITAL-COMMON>
9,621,767
<SHARES-COMMON-STOCK>
9,621,256
<SHARES-COMMON-PRIOR>
9,497,794
<ACCUMULATED-NII-CURRENT>
0
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(2,395)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
<NET-ASSETS>
9,619,372
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
315,052
<OTHER-INCOME>
0
<EXPENSES-NET>
21,197
<NET-INVESTMENT-INCOME>
293,855
<REALIZED-GAINS-CURRENT>
126
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
293,981
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
293,855
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
3,842,325
<NUMBER-OF-SHARES-REDEEMED>
3,992,535
<SHARES-REINVESTED>
273,672
<NET-CHANGE-IN-ASSETS>
123,588
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(2,521)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
21,322
<INTEREST-EXPENSE>
0
<GROSS-EXPENSE>
21,342
<AVERAGE-NET-ASSETS>
9,406,169
<PER-SHARE-NAV-BEGIN>
1.000
<PER-SHARE-NII>
.031
<PER-SHARE-GAIN-APPREC>
0
<PER-SHARE-DIVIDEND>
.031
<PER-SHARE-DISTRIBUTIONS>
0
<RETURNS-OF-CAPITAL>
0
<PER-SHARE-NAV-END>
1.000
<EXPENSE-RATIO>
45
</TABLE>