DREYFUS INSTITUTIONAL MONEY MARKET FUND INC
NSAR-A, 1999-08-20
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<PAGE>      PAGE  1
000 A000000 06/30/99
000 C000000 315783
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0
000 J000000 U
001 A000000 DREYFUS INSTITUTIONAL MONEY MARKET FUND
001 B000000 811-3025
001 C000000 2129226775
002 A000000 200 PARK AVENUE
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10166
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  2
018  00AA00 Y
019 A00AA00 Y
019 B00AA00  163
019 C00AA00 DREYFUSFAM
022 A000001 UBS AG
022 B000001 13-2932996
022 C000001   2246455
022 D000001         0
022 A000002 PRUDENTIAL SECURITIES INCORPORATED
022 B000002 22-2347336
022 C000002   1463717
022 D000002         0
022 A000003 ASSOCIATES CORPORATION OF NORTH AMERICA
022 B000003 06-0943899
022 C000003   1274745
022 D000003         0
022 A000004 BEAR, STEARNS & CO.INC.
022 B000004 13-3299429
022 C000004   1018901
022 D000004         0
022 A000005 BARCLAYS DE ZOETE WEDD SECURITIES, INC.
022 B000005 13-3551367
022 C000005    997176
022 D000005         0
022 A000006 MORGAN STANLEY DEAN WITTER & CO.
022 B000006 13-2655998
022 C000006    995988
022 D000006         0
022 A000007 DONALDSON, LUFKIN & JENRETTE SECURITIES CORP.
<PAGE>      PAGE  2
022 B000007 13-2741729
022 C000007    978030
022 D000007     12973
022 A000008 REPUBLIC NATIONAL BANK OF NEW YORK
022 B000008 13-2774727
022 C000008    952194
022 D000008         0
022 A000009 CIBC OPPENHEIMER
022 B000009 13-5942430
022 C000009    883000
022 D000009         0
022 A000010 J.P. MORGAN SECURITIES INC.
022 B000010 13-3224016
022 C000010    839000
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023 D000000      49988
024  00AA00 Y
077 A000000 N
078  000000 N
025 A000101 BEAR, STEARNS & CO. INC.
025 B000101 13-3299429
025 C000101 D
025 D000101   23876
025 A000102 DONALDSON, LUFKIN & JENRETTE SECURITIES CORP.
025 B000102 13-2741729
025 C000102 D
025 D000102    4971
025 A000103 REPUBLIC NATIONAL BANK OF NEW YORK
025 B000103 13-2774727
025 C000103 D
025 D000103   19644
025 A000104 UBS AG
025 B000104 13-2932996
025 C000104 D
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<PAGE>      PAGE  3
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070 C020100 N
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070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 N
<PAGE>      PAGE  4
070 F020100 N
070 G010100 N
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 N
070 K020100 N
070 L010100 N
070 L020100 N
070 M010100 N
070 M020100 N
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070 O020100 N
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070 Q010100 N
070 Q020100 N
070 R010100 N
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<PAGE>      PAGE  5
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025 A000201 BEAR, STEARNS & CO. INC.
025 B000201 13-3299429
025 C000201 D
<PAGE>      PAGE  6
025 D000201    8000
025 A000202 MORGAN STANLEY DEAN WITTER & CO.
025 B000202 13-2655998
025 C000202 D
025 D000202    8000
025 A000203 DONALDSON, LUFKIN & JENRETTE SECURITIES CORP.
025 B000203 13-2741729
025 C000203 D
025 D000203    8000
028 A010200     61950
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062 A000200 Y
062 B000200  55.3
062 C000200   0.0
062 D000200  43.4
062 E000200   0.0
062 F000200   0.0
062 G000200   0.0
062 H000200   0.0
062 I000200   0.0
062 J000200   0.0
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062 L000200   0.0
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<PAGE>      PAGE  7
062 N000200   0.0
062 O000200   0.0
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062 R000200   0.0
063 A000200  86
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 N
070 K020200 N
070 L010200 N
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 N
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 N
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070 Q020200 N
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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SIGNATURE   STEPHANIE D. PIERCE
TITLE       ASSISTANT TRESURER


WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000315783
<NAME> DREYFUS INSTITUTIONAL MONEY MARKET FUND
<SERIES>
   <NUMBER> 02
   <NAME> DREYFUS GOVERNMENT SECURITIES SERIES
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               JUN-30-1999
<INVESTMENTS-AT-COST>                            89451
<INVESTMENTS-AT-VALUE>                           89451
<RECEIVABLES>                                      985
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<TOTAL-ASSETS>                                   90644
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<OTHER-ITEMS-LIABILITIES>                           34
<TOTAL-LIABILITIES>                                 34
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         90620
<SHARES-COMMON-STOCK>                            90620
<SHARES-COMMON-PRIOR>                            68615
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<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                             10
<OVERDISTRIBUTION-GAINS>                             0
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<NET-ASSETS>                                     90610
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 1906
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     254
<NET-INVESTMENT-INCOME>                           1652
<REALIZED-GAINS-CURRENT>                          (10)
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                             1642
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (1652)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         395820
<NUMBER-OF-SHARES-REDEEMED>                   (374495)
<SHARES-REINVESTED>                                681
<NET-CHANGE-IN-ASSETS>                           21995
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              201
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    254
<AVERAGE-NET-ASSETS>                             80953
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   .020
<PER-SHARE-GAIN-APPREC>                           .000
<PER-SHARE-DIVIDEND>                            (.020)
<PER-SHARE-DISTRIBUTIONS>                         .000
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                   .006
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000315783
<NAME> DREYFUS INSTITUTIONAL MONEY MARKET FUND
<SERIES>
   <NUMBER> 01
   <NAME> DREYFUS MONEY MARKET SERIES
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               JUN-30-1999
<INVESTMENTS-AT-COST>                           541055
<INVESTMENTS-AT-VALUE>                          541055
<RECEIVABLES>                                     3796
<ASSETS-OTHER>                                     757
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  545608
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          322
<TOTAL-LIABILITIES>                                322
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        545324
<SHARES-COMMON-STOCK>                           545324
<SHARES-COMMON-PRIOR>                           540317
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           (38)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                    545286
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                14272
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    1603
<NET-INVESTMENT-INCOME>                          12669
<REALIZED-GAINS-CURRENT>                           (3)
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<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (12669)
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<NUMBER-OF-SHARES-REDEEMED>                  (1759372)
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<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                         (34)
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<GROSS-ADVISORY-FEES>                             1410
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   1603
<AVERAGE-NET-ASSETS>                            568760
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   .022
<PER-SHARE-GAIN-APPREC>                           .000
<PER-SHARE-DIVIDEND>                            (.022)
<PER-SHARE-DISTRIBUTIONS>                         .000
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                   .006
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0


</TABLE>


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