<PAGE> PAGE 1
000 A000000 10/31/98
000 C000000 0000917286
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 FIDELITY HEREFORD STREET TRUST
001 B000000 811-7139
001 C000000 6037917486
002 A000000 ONE SPARTAN WAY (MAIL ZONE TS2S)
002 B000000 MERRIMACK
002 C000000 NH
002 D010000 03054
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 3
007 C010100 1
007 C020100 SPARTAN MONEY MARKET FUND
007 C030100 N
007 C010200 2
007 C020200 SPARTAN U.S. GOVERNMENT MONEY MARKET FUND
007 C030200 N
007 C010300 3
007 C020300 SPARTAN U.S. TREASURY MONEY MARKET FUND
007 C030300 N
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A00AA01 FIDELITY MANAGEMENT & RESEARCH COMPANY
008 B00AA01 A
008 C00AA01 801-7884
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02109
008 A00AA02 FIDELITY INVESTMENTS MONEY MANAGEMENT, INC.
008 B00AA02 S
008 C00AA02 801-0000
008 D01AA02 MERRIMACK
008 D02AA02 NH
008 D03AA02 03054
011 A00AA01 FIDELITY DISTRIBUTORS CORPORATION
<PAGE> PAGE 2
011 B00AA01 8-8775
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02109
012 A00AA01 FIDELITY SERVICE COMPANY, INC.
012 B00AA01 84-00216
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02109
014 A00AA01 FIDELITY DISTRIBUTORS CORPORATION
014 B00AA01 8-8775
014 A00AA02 FIDELITY BROKERAGE SERVICES
014 B00AA02 8-23292
014 A00AA03 DELETE
014 A00AA04 DELETE
015 A00AA01 THE BANK OF NEW YORK
015 B00AA01 C
015 C01AA01 NEW YORK
015 C02AA01 NY
015 C03AA01 10286
015 E01AA01 X
018 00AA00 Y
019 A00AA00 Y
019 B00AA00 224
019 C00AA00 FIDELITYZZ
020 C000001 0
020 C000002 0
020 C000003 0
020 C000004 0
020 C000005 0
020 C000006 0
020 C000007 0
020 C000008 0
020 C000009 0
020 C000010 0
021 000000 0
022 A000001 DEUTSCHE BANK, A.G.
022 B000001 13-2730828
022 C000001 2577187
022 D000001 787535
022 A000002 MORGAN (J.P.) SECURITIES, INC.
022 B000002 13-3224016
022 C000002 3639669
022 D000002 969639
022 A000003 DLJ CAPITAL MARKETS
022 B000003 13-2741729
022 C000003 1776089
022 D000003 1280815
022 A000004 GOLDMAN SACHS & CO.
022 B000004 13-5108880
022 C000004 2083670
<PAGE> PAGE 3
022 D000004 698056
022 A000005 MORGAN STANLEY & CO., INC.
022 B000005 13-2655998
022 C000005 1384245
022 D000005 992155
022 A000006 MERRILL LYNCH
022 B000006 13-5674085
022 C000006 1596732
022 D000006 325615
022 A000007 GMAC
022 B000007 00-0000000
022 C000007 1592518
022 D000007 0
022 A000008 GENERAL ELECTRIC CREDIT
022 B000008 13-1500700
022 C000008 1572108
022 D000008 0
022 A000009 HSBC SECURITIES INC.
022 B000009 00-0000000
022 C000009 550841
022 D000009 771133
022 A000010 LEHMAN BROTHERS INC.
022 B000010 13-2518466
022 C000010 974046
022 D000010 323795
023 C000000 55369072
023 D000000 9345773
026 A000000 Y
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 Y
026 G010000 N
026 G020000 N
026 H000000 Y
027 000000 Y
029 00AA00 N
030 A00AA00 0
030 B00AA00 0.00
030 C00AA00 0.00
031 A00AA00 0
031 B00AA00 0
032 00AA00 0
033 00AA00 0
034 00AA00 N
035 00AA00 0
036 B00AA00 0
037 00AA00 N
038 00AA00 0
039 00AA00 N
<PAGE> PAGE 4
040 00AA00 Y
041 00AA00 N
042 A00AA00 0
042 B00AA00 0
042 C00AA00 0
042 D00AA00 0
042 E00AA00 0
042 F00AA00 0
042 G00AA00 0
042 H00AA00 0
043 00AA00 0
044 00AA00 0
045 00AA00 Y
046 00AA00 N
047 00AA00 Y
048 00AA00 0.450
048 A01AA00 0
048 A02AA00 0.000
048 B01AA00 0
048 B02AA00 0.000
048 C01AA00 0
048 C02AA00 0.000
048 D01AA00 0
048 D02AA00 0.000
048 E01AA00 0
048 E02AA00 0.000
048 F01AA00 0
048 F02AA00 0.000
048 G01AA00 0
048 G02AA00 0.000
048 H01AA00 0
048 H02AA00 0.000
048 I01AA00 0
048 I02AA00 0.000
048 J01AA00 0
048 J02AA00 0.000
048 K01AA00 0
048 K02AA00 0.000
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 Y
054 D00AA00 Y
054 E00AA00 Y
054 F00AA00 Y
054 G00AA00 Y
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 Y
054 L00AA00 Y
054 M00AA00 Y
<PAGE> PAGE 5
054 N00AA00 Y
054 O00AA00 Y
055 A00AA00 N
055 B00AA00 N
056 00AA00 Y
057 00AA00 N
058 A00AA00 N
059 00AA00 Y
060 A00AA00 Y
060 B00AA00 Y
061 00AA00 20000
066 A00AA00 N
067 00AA00 N
068 A00AA00 N
068 B00AA00 N
069 00AA00 N
077 A000000 N
078 000000 N
080 A00AA00 AMERICAN INTL. SPECIALTY LINES INS. CO.
080 B00AA00 FEDERAL INSURANCE COMPANY
080 C00AA00 220000
081 A00AA00 Y
081 B00AA00 226
082 A00AA00 N
082 B00AA00 0
083 A00AA00 N
083 B00AA00 0
084 A00AA00 N
084 B00AA00 0
085 A00AA00 Y
085 B00AA00 N
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
013 A000101 PRICEWATERHOUSECOOPERS LLP
013 B010101 BOSTON
013 B020101 MA
013 B030101 02109
024 000100 Y
025 A000101 DEUTSCHE BANK, A.G.
025 B000101 13-2730828
025 C000101 D
<PAGE> PAGE 6
025 D000101 415514
025 A000102 GENERAL ELECTRIC
025 B000102 13-1500700
025 C000102 D
025 D000102 448736
025 A000103 GMAC
025 B000103 00-0000000
025 C000103 D
025 D000103 371268
025 A000104 GOLDMAN SACHS
025 B000104 13-5108880
025 C000104 D
025 D000104 254622
025 A000105 LEHMAN BROTHERS
025 B000105 13-2518466
025 C000105 D
025 D000105 24985
025 A000106 MERRILL LYNCH
025 B000106 13-5674085
025 C000106 D
025 D000106 69838
025 A000107 JP MORGAN
025 B000107 13-3224016
025 C000107 D
025 D000107 134757
025 A000108 MORGAN STANLEY AND CO.
025 B000108 13-2655998
025 C000108 D
025 D000108 149073
028 A010100 775972
028 A020100 38647
028 A030100 0
028 A040100 742530
028 B010100 665267
028 B020100 37343
028 B030100 0
028 B040100 816452
028 C010100 795083
028 C020100 38444
028 C030100 0
028 C040100 719147
028 D010100 1154343
028 D020100 38232
028 D030100 0
028 D040100 663227
028 E010100 855070
028 E020100 37992
028 E030100 0
028 E040100 874687
028 F010100 1167726
028 F020100 39112
<PAGE> PAGE 7
028 F030100 0
028 F040100 939285
028 G010100 5413461
028 G020100 229770
028 G030100 0
028 G040100 4755328
028 H000100 0
049 000100 N
050 000100 N
051 000100 N
052 000100 N
053 A000100 Y
053 B000100 Y
053 C000100 N
062 A000100 Y
062 B000100 0.0
062 C000100 0.0
062 D000100 0.0
062 E000100 0.0
062 F000100 4.3
062 G000100 40.2
062 H000100 0.0
062 I000100 35.5
062 J000100 0.0
062 K000100 0.0
062 L000100 20.0
062 M000100 0.0
062 N000100 0.0
062 O000100 0.0
062 P000100 0.0
062 Q000100 0.0
062 R000100 0.0
063 A000100 73
063 B000100 0.0
064 A000100 N
064 B000100 N
070 A010100 Y
070 A020100 Y
070 B010100 N
070 B020100 N
070 C010100 N
070 C020100 N
070 D010100 N
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 N
070 G020100 N
070 H010100 N
<PAGE> PAGE 8
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 Y
070 K010100 Y
070 K020100 N
070 L010100 Y
070 L020100 Y
070 M010100 N
070 M020100 N
070 N010100 Y
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 N
070 Q010100 Y
070 Q020100 N
070 R010100 Y
070 R020100 N
071 A000100 0
071 B000100 0
071 C000100 0
071 D000100 0
072 A000100 6
072 B000100 260663
072 C000100 0
072 D000100 0
072 E000100 0
072 F000100 20771
072 G000100 0
072 H000100 0
072 I000100 0
072 J000100 0
072 K000100 0
072 L000100 0
072 M000100 18
072 N000100 0
072 O000100 0
072 P000100 0
072 Q000100 0
072 R000100 0
072 S000100 0
072 T000100 0
072 U000100 0
072 V000100 0
072 W000100 0
072 X000100 20789
072 Y000100 185
072 Z000100 240059
<PAGE> PAGE 9
072AA000100 16
072BB000100 0
072CC010100 0
072CC020100 0
072DD010100 240059
072DD020100 0
072EE000100 0
073 A010100 0.0262
073 A020100 0.0000
073 B000100 0.0000
073 C000100 0.0000
074 A000100 0
074 B000100 622
074 C000100 9830077
074 D000100 0
074 E000100 0
074 F000100 0
074 G000100 0
074 H000100 0
074 I000100 0
074 J000100 0
074 K000100 0
074 L000100 119554
074 M000100 0
074 N000100 9950253
074 O000100 135975
074 P000100 3721
074 Q000100 0
074 R010100 0
074 R020100 0
074 R030100 0
074 R040100 59583
074 S000100 0
074 T000100 9750974
074 U010100 9753073
074 U020100 0
074 V010100 1.00
074 V020100 0.00
074 W000100 0.9998
074 X000100 116699
074 Y000100 0
075 A000100 9163498
075 B000100 0
076 000100 0.00
013 A000201 PRICEWATERHOUSECOOPERS LLP
013 B010201 BOSTON
013 B020201 MA
013 B030201 02109
024 000200 N
028 A010200 47529
028 A020200 3249
<PAGE> PAGE 10
028 A030200 0
028 A040200 53872
028 B010200 66422
028 B020200 3144
028 B030200 0
028 B040200 70290
028 C010200 81548
028 C020200 3285
028 C030200 0
028 C040200 67658
028 D010200 95911
028 D020200 3286
028 D030200 0
028 D040200 56010
028 E010200 89396
028 E020200 3321
028 E030200 0
028 E040200 78003
028 F010200 105643
028 F020200 3473
028 F030200 0
028 F040200 68901
028 G010200 486449
028 G020200 19758
028 G030200 0
028 G040200 394734
028 H000200 0
049 000200 N
050 000200 N
051 000200 N
052 000200 N
053 A000200 Y
053 B000200 Y
053 C000200 N
062 A000200 Y
062 B000200 0.0
062 C000200 67.3
062 D000200 32.7
062 E000200 0.0
062 F000200 0.0
062 G000200 0.0
062 H000200 0.0
062 I000200 0.0
062 J000200 0.0
062 K000200 0.0
062 L000200 0.0
062 M000200 0.0
062 N000200 0.0
062 O000200 0.0
062 P000200 0.0
062 Q000200 0.0
<PAGE> PAGE 11
062 R000200 0.0
063 A000200 62
063 B000200 0.0
064 A000200 Y
064 B000200 N
070 A010200 Y
070 A020200 Y
070 B010200 N
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 N
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 N
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 N
070 K010200 Y
070 K020200 N
070 L010200 N
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 Y
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 N
070 Q010200 Y
070 Q020200 N
070 R010200 Y
070 R020200 N
071 A000200 0
071 B000200 0
071 C000200 0
071 D000200 0
072 A000200 6
072 B000200 22582
072 C000200 0
072 D000200 0
072 E000200 0
072 F000200 1819
<PAGE> PAGE 12
072 G000200 0
072 H000200 0
072 I000200 0
072 J000200 0
072 K000200 0
072 L000200 0
072 M000200 0
072 N000200 0
072 O000200 0
072 P000200 0
072 Q000200 0
072 R000200 0
072 S000200 0
072 T000200 0
072 U000200 0
072 V000200 0
072 W000200 0
072 X000200 1819
072 Y000200 18
072 Z000200 20781
072AA000200 18
072BB000200 0
072CC010200 0
072CC020200 0
072DD010200 20781
072DD020200 0
072EE000200 0
073 A010200 0.0258
073 A020200 0.0000
073 B000200 0.0000
073 C000200 0.0000
074 A000200 0
074 B000200 294288
074 C000200 605139
074 D000200 0
074 E000200 0
074 F000200 0
074 G000200 0
074 H000200 0
074 I000200 0
074 J000200 0
074 K000200 0
074 L000200 7111
074 M000200 0
074 N000200 906538
074 O000200 15996
074 P000200 335
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
<PAGE> PAGE 13
074 R040200 5544
074 S000200 0
074 T000200 884663
074 U010200 884798
074 U020200 0
074 V010200 1.00
074 V020200 0.00
074 W000200 0.9998
074 X000200 9408
074 Y000200 0
075 A000200 802829
075 B000200 0
076 000200 0.00
013 A000301 PRICEWATERHOUSECOOPERS LLP
013 B010301 BOSTON
013 B020301 MA
013 B030301 02109
024 000300 N
028 A010300 107367
028 A020300 7615
028 A030300 0
028 A040300 133723
028 B010300 135465
028 B020300 7322
028 B030300 0
028 B040300 159246
028 C010300 103444
028 C020300 7497
028 C030300 0
028 C040300 122346
028 D010300 201694
028 D020300 7430
028 D030300 0
028 D040300 112148
028 E010300 188340
028 E020300 7337
028 E030300 0
028 E040300 164417
028 F010300 289235
028 F020300 7730
028 F030300 0
028 F040300 144822
028 G010300 1025545
028 G020300 44931
028 G030300 0
028 G040300 836702
028 H000300 0
049 000300 N
050 000300 N
051 000300 N
052 000300 N
<PAGE> PAGE 14
053 A000300 Y
053 B000300 Y
053 C000300 N
062 A000300 Y
062 B000300 100.0
062 C000300 0.0
062 D000300 0.0
062 E000300 0.0
062 F000300 0.0
062 G000300 0.0
062 H000300 0.0
062 I000300 0.0
062 J000300 0.0
062 K000300 0.0
062 L000300 0.0
062 M000300 0.0
062 N000300 0.0
062 O000300 0.0
062 P000300 0.0
062 Q000300 0.0
062 R000300 0.0
063 A000300 74
063 B000300 0.0
064 A000300 N
064 B000300 N
070 A010300 Y
070 A020300 Y
070 B010300 N
070 B020300 N
070 C010300 N
070 C020300 N
070 D010300 N
070 D020300 N
070 E010300 N
070 E020300 N
070 F010300 N
070 F020300 N
070 G010300 N
070 G020300 N
070 H010300 N
070 H020300 N
070 I010300 N
070 I020300 N
070 J010300 Y
070 J020300 N
070 K010300 Y
070 K020300 N
070 L010300 N
070 L020300 N
070 M010300 N
070 M020300 N
<PAGE> PAGE 15
070 N010300 Y
070 N020300 N
070 O010300 Y
070 O020300 Y
070 P010300 Y
070 P020300 N
070 Q010300 Y
070 Q020300 N
070 R010300 Y
070 R020300 N
071 A000300 0
071 B000300 0
071 C000300 0
071 D000300 0
072 A000300 6
072 B000300 51943
072 C000300 0
072 D000300 0
072 E000300 0
072 F000300 4393
072 G000300 0
072 H000300 0
072 I000300 0
072 J000300 0
072 K000300 0
072 L000300 0
072 M000300 4
072 N000300 0
072 O000300 0
072 P000300 273
072 Q000300 0
072 R000300 0
072 S000300 0
072 T000300 0
072 U000300 0
072 V000300 0
072 W000300 0
072 X000300 4670
072 Y000300 60
072 Z000300 47333
072AA000300 30
072BB000300 0
072CC010300 0
072CC020300 0
072DD010300 47333
072DD020300 0
072EE000300 0
073 A010300 0.0244
073 A020300 0.0000
073 B000300 0.0000
073 C000300 0.0000
<PAGE> PAGE 16
074 A000300 0
074 B000300 0
074 C000300 2039658
074 D000300 0
074 E000300 0
074 F000300 0
074 G000300 0
074 H000300 0
074 I000300 0
074 J000300 638051
074 K000300 0
074 L000300 32030
074 M000300 0
074 N000300 2709739
074 O000300 495386
074 P000300 802
074 Q000300 0
074 R010300 56875
074 R020300 0
074 R030300 0
074 R040300 10354
074 S000300 0
074 T000300 2146322
074 U010300 2146233
074 U020300 0
074 V010300 1.00
074 V020300 0.00
074 W000300 1.0000
074 X000300 20135
074 Y000300 0
075 A000300 1937947
075 B000300 0
076 000300 0.00
SIGNATURE JOHN H. COSTELLO
TITLE ASSISTANT TREASURER
<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-30-1999
<PERIOD-END>
oct-31-1998
<INVESTMENTS-AT-COST>
9,830,699
<INVESTMENTS-AT-VALUE>
9,830,699
<RECEIVABLES>
119,554
<ASSETS-OTHER>
0
<OTHER-ITEMS-ASSETS>
0
<TOTAL-ASSETS>
9,950,253
<PAYABLE-FOR-SECURITIES>
135,975
<SENIOR-LONG-TERM-DEBT>
0
<OTHER-ITEMS-LIABILITIES>
63,304
<TOTAL-LIABILITIES>
199,279
<SENIOR-EQUITY>
0
<PAID-IN-CAPITAL-COMMON>
9,753,584
<SHARES-COMMON-STOCK>
9,753,073
<SHARES-COMMON-PRIOR>
8,865,170
<ACCUMULATED-NII-CURRENT>
0
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(2,610)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
<NET-ASSETS>
9,750,974
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
260,663
<OTHER-INCOME>
0
<EXPENSES-NET>
20,604
<NET-INVESTMENT-INCOME>
240,059
<REALIZED-GAINS-CURRENT>
16
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
240,075
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
240,059
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
5,413,461
<NUMBER-OF-SHARES-REDEEMED>
4,755,328
<SHARES-REINVESTED>
229,770
<NET-CHANGE-IN-ASSETS>
887,919
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(2,626)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
20,771
<INTEREST-EXPENSE>
0
<GROSS-EXPENSE>
20,789
<AVERAGE-NET-ASSETS>
9,163,498
<PER-SHARE-NAV-BEGIN>
1.000
<PER-SHARE-NII>
.026
<PER-SHARE-GAIN-APPREC>
0
<PER-SHARE-DIVIDEND>
.026
<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> 21
<NAME> Spartan U.S. Government Money Market Fund
<MULTIPLIER> 1,000
<S>
<C>
<PERIOD-TYPE>
6-mos
<FISCAL-YEAR-END>
apr-30-1999
<PERIOD-END>
oct-31-1998
<INVESTMENTS-AT-COST>
899,427
<INVESTMENTS-AT-VALUE>
899,427
<RECEIVABLES>
7,111
<ASSETS-OTHER>
0
<OTHER-ITEMS-ASSETS>
0
<TOTAL-ASSETS>
906,538
<PAYABLE-FOR-SECURITIES>
15,996
<SENIOR-LONG-TERM-DEBT>
0
<OTHER-ITEMS-LIABILITIES>
5,879
<TOTAL-LIABILITIES>
21,875
<SENIOR-EQUITY>
0
<PAID-IN-CAPITAL-COMMON>
884,798
<SHARES-COMMON-STOCK>
884,798
<SHARES-COMMON-PRIOR>
773,324
<ACCUMULATED-NII-CURRENT>
0
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(135)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
<NET-ASSETS>
884,663
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
22,582
<OTHER-INCOME>
0
<EXPENSES-NET>
1,801
<NET-INVESTMENT-INCOME>
20,781
<REALIZED-GAINS-CURRENT>
18
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
20,799
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
20,781
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
486,450
<NUMBER-OF-SHARES-REDEEMED>
394,734
<SHARES-REINVESTED>
19,758
<NET-CHANGE-IN-ASSETS>
111,492
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(152)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
1,819
<INTEREST-EXPENSE>
0
<GROSS-EXPENSE>
1,819
<AVERAGE-NET-ASSETS>
802,829
<PER-SHARE-NAV-BEGIN>
1.000
<PER-SHARE-NII>
.026
<PER-SHARE-GAIN-APPREC>
0
<PER-SHARE-DIVIDEND>
.026
<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>
6-mos
<FISCAL-YEAR-END>
apr-30-1999
<PERIOD-END>
oct-31-1998
<INVESTMENTS-AT-COST>
2,039,658
<INVESTMENTS-AT-VALUE>
2,039,658
<RECEIVABLES>
670,081
<ASSETS-OTHER>
0
<OTHER-ITEMS-ASSETS>
0
<TOTAL-ASSETS>
2,709,739
<PAYABLE-FOR-SECURITIES>
495,386
<SENIOR-LONG-TERM-DEBT>
0
<OTHER-ITEMS-LIABILITIES>
68,031
<TOTAL-LIABILITIES>
563,417
<SENIOR-EQUITY>
0
<PAID-IN-CAPITAL-COMMON>
2,146,364
<SHARES-COMMON-STOCK>
2,146,233
<SHARES-COMMON-PRIOR>
1,912,459
<ACCUMULATED-NII-CURRENT>
0
<OVERDISTRIBUTION-NII>
0
<ACCUMULATED-NET-GAINS>
(42)
<OVERDISTRIBUTION-GAINS>
0
<ACCUM-APPREC-OR-DEPREC>
0
<NET-ASSETS>
2,146,322
<DIVIDEND-INCOME>
0
<INTEREST-INCOME>
51,943
<OTHER-INCOME>
0
<EXPENSES-NET>
4,610
<NET-INVESTMENT-INCOME>
47,333
<REALIZED-GAINS-CURRENT>
30
<APPREC-INCREASE-CURRENT>
0
<NET-CHANGE-FROM-OPS>
47,363
<EQUALIZATION>
0
<DISTRIBUTIONS-OF-INCOME>
47,333
<DISTRIBUTIONS-OF-GAINS>
0
<DISTRIBUTIONS-OTHER>
0
<NUMBER-OF-SHARES-SOLD>
1,025,545
<NUMBER-OF-SHARES-REDEEMED>
836,702
<SHARES-REINVESTED>
44,931
<NET-CHANGE-IN-ASSETS>
233,804
<ACCUMULATED-NII-PRIOR>
0
<ACCUMULATED-GAINS-PRIOR>
(72)
<OVERDISTRIB-NII-PRIOR>
0
<OVERDIST-NET-GAINS-PRIOR>
0
<GROSS-ADVISORY-FEES>
4,393
<INTEREST-EXPENSE>
273
<GROSS-EXPENSE>
4,670
<AVERAGE-NET-ASSETS>
1,937,947
<PER-SHARE-NAV-BEGIN>
1.000
<PER-SHARE-NII>
.024
<PER-SHARE-GAIN-APPREC>
0
<PER-SHARE-DIVIDEND>
.024
<PER-SHARE-DISTRIBUTIONS>
0
<RETURNS-OF-CAPITAL>
0
<PER-SHARE-NAV-END>
1.000
<EXPENSE-RATIO>
.48
<AVG-DEBT-OUTSTANDING>
0
<AVG-DEBT-PER-SHARE>
0
</TABLE>
