<PAGE> PAGE 1
000 A000000 07/31/99
000 C000000 0000878734
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 NEW YORK MUNICIPAL CASH MANAGEMENT
001 B000000 811-6395
001 C000000 2129226854
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 N
007 B000000 0
008 A000001 THE DREYFUS CORPORATION
008 B000001 A
008 C000001 801-8147
008 D010001 NEW YORK
008 D020001 NY
008 D030001 10166
011 A000001 PREMIER MUTUAL FUND SERVICES, INC.
011 B000001 8-13801
011 C010001 NEW YORK
011 C020001 NY
011 C030001 10166
013 A000001 ERNST & YOUNG LLP
013 B010001 NEW YORK
013 B020001 NY
013 B030001 10019
015 A000001 THE BANK OF NEW YORK
015 B000001 C
015 C010001 NEW YORK
015 C020001 NY
015 C030001 10286
015 E010001 X
015 A000002 BANKERS TRUST COMPANY
015 B000002 S
015 C010002 NEW YORK
015 C020002 NY
015 C030002 10015
015 E010002 X
015 A000003 CHASE MANHATTAN BANK
015 B000003 S
<PAGE> PAGE 2
015 C010003 NEW YORK
015 C020003 NY
015 C030003 10041
015 E010003 X
018 000000 Y
019 A000000 Y
019 B000000 163
019 C000000 DREYFUSFAM
022 A000001 SALOMON SMITH BARNEY
022 B000001 13-1912900
022 C000001 114300
022 D000001 122330
022 A000002 GOLDMAN, SACHS & CO.
022 B000002 13-5108880
022 C000002 37150
022 D000002 57500
022 A000003 MORGAN STANLEY DEAN WITTER & CO.
022 B000003 13-2655998
022 C000003 39350
022 D000003 25300
022 A000004 LEHMAN BROTHERS INC.
022 B000004 13-2518466
022 C000004 55200
022 D000004 8000
022 A000005 PAINEWEBBER INCORPORATED
022 B000005 13-2638166
022 C000005 30600
022 D000005 21900
022 A000006 FIRST ALBANY CORPORATION
022 B000006 14-1391446
022 C000006 27570
022 D000006 13000
022 A000007 MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
022 B000007 13-5674085
022 C000007 13730
022 D000007 7730
022 A000008 BT ALEX BROWN SECURITIES CORPORATION
022 B000008 13-3131014
022 C000008 20310
022 D000008 0
022 A000009 BEAR, STEARNS & CO. INC.
022 B000009 13-3299429
022 C000009 14000
022 D000009 0
022 A000010 FIRST CHICAGO INVESTMENT SECURITIES, INC.
022 B000010 36-0899825
022 C000010 0
022 D000010 12700
023 C000000 356410
023 D000000 274935
024 000000 N
<PAGE> PAGE 3
026 A000000 Y
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 Y
027 000000 Y
028 A010000 145554
028 A020000 127
028 A030000 0
028 A040000 165230
028 B010000 200104
028 B020000 139
028 B030000 0
028 B040000 173429
028 C010000 255451
028 C020000 141
028 C030000 0
028 C040000 301586
028 D010000 173107
028 D020000 226
028 D030000 0
028 D040000 127030
028 E010000 111747
028 E020000 214
028 E030000 0
028 E040000 138389
028 F010000 153721
028 F020000 161
028 F030000 0
028 F040000 157904
028 G010000 1039684
028 G020000 1008
028 G030000 0
028 G040000 1063568
028 H000000 0
034 000000 N
035 000000 0
036 B000000 0
037 000000 N
038 000000 0
039 000000 N
040 000000 Y
041 000000 Y
042 A000000 63
042 B000000 0
042 C000000 37
042 D000000 0
<PAGE> PAGE 4
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 12
044 000000 0
045 000000 Y
046 000000 N
047 000000 Y
048 000000 0.200
048 A010000 0
048 A020000 0.000
048 B010000 0
048 B020000 0.000
048 C010000 0
048 C020000 0.000
048 D010000 0
048 D020000 0.000
048 E010000 0
048 E020000 0.000
048 F010000 0
048 F020000 0.000
048 G010000 0
048 G020000 0.000
048 H010000 0
048 H020000 0.000
048 I010000 0
048 I020000 0.000
048 J010000 0
048 J020000 0.000
048 K010000 0
048 K020000 0.000
049 000000 N
050 000000 N
051 000000 N
052 000000 N
053 A000000 Y
053 B000000 Y
053 C000000 N
054 A000000 Y
054 B000000 Y
054 C000000 Y
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 Y
054 H000000 N
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 Y
<PAGE> PAGE 5
054 M000000 Y
054 N000000 N
054 O000000 Y
055 A000000 Y
055 B000000 N
056 000000 N
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 N
060 B000000 N
061 000000 10000000
062 A000000 Y
062 B000000 0.0
062 C000000 0.0
062 D000000 0.0
062 E000000 98.3
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
063 A000000 54
063 B000000 0.0
064 A000000 Y
064 B000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 N
070 F020000 N
<PAGE> PAGE 6
070 G010000 N
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 N
070 J020000 N
070 K010000 N
070 K020000 N
070 L010000 N
070 L020000 N
070 M010000 N
070 M020000 N
070 N010000 N
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 0
071 B000000 0
071 C000000 0
071 D000000 0
072 A000000 6
072 B000000 4031
072 C000000 0
072 D000000 0
072 E000000 0
072 F000000 270
072 G000000 0
072 H000000 0
072 I000000 0
072 J000000 0
072 K000000 0
072 L000000 0
072 M000000 0
072 N000000 0
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 0
072 S000000 0
072 T000000 12
072 U000000 0
072 V000000 0
072 W000000 0
<PAGE> PAGE 7
072 X000000 282
072 Y000000 0
072 Z000000 3749
072AA000000 0
072BB000000 0
072CC010000 1
072CC020000 0
072DD010000 3632
072DD020000 117
072EE000000 0
073 A010000 0.0000
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 3066
074 B000000 0
074 C000000 250223
074 D000000 0
074 E000000 0
074 F000000 0
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 0
074 K000000 0
074 L000000 1359
074 M000000 4
074 N000000 254652
074 O000000 0
074 P000000 45
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 1
074 S000000 0
074 T000000 254606
074 U010000 246427
074 U020000 8184
074 V010000 1.00
074 V020000 0.00
074 W000000 0.9998
074 X000000 906
074 Y000000 0
075 A000000 262928
075 B000000 0
076 000000 0.00
077 A000000 N
SIGNATURE STEPHANIE D. PIERCE
TITLE ASSISTANT TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000878734
<NAME> DREYFUS NEW YORK MUNICIPAL CASH MANAGEMENT
<SERIES>
<NUMBER> 001
<NAME> INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> JAN-31-1999
<PERIOD-END> JUL-31-1999
<INVESTMENTS-AT-COST> 250222
<INVESTMENTS-AT-VALUE> 250222
<RECEIVABLES> 1359
<ASSETS-OTHER> 3070
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 254652
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 46
<TOTAL-LIABILITIES> 46
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 254611
<SHARES-COMMON-STOCK> 246427
<SHARES-COMMON-PRIOR> 268249
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (6)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1
<NET-ASSETS> 246424
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4031
<OTHER-INCOME> 0
<EXPENSES-NET> 282
<NET-INVESTMENT-INCOME> 3749
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 1
<NET-CHANGE-FROM-OPS> 3750
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3632)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1035801
<NUMBER-OF-SHARES-REDEEMED> (1058530)
<SHARES-REINVESTED> 907
<NET-CHANGE-IN-ASSETS> (22875)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (6)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 270
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 282
<AVERAGE-NET-ASSETS> 262928
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .014
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.014)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> .002
[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> 0000878734
<NAME> DREYFUS NEW YORK MUNICIPAL CASH MANAGEMENT
<SERIES>
<NUMBER> 002
<NAME> INVESTOR SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> JAN-31-1999
<PERIOD-END> JUL-31-1999
<INVESTMENTS-AT-COST> 250222
<INVESTMENTS-AT-VALUE> 250222
<RECEIVABLES> 1359
<ASSETS-OTHER> 3070
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 254652
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 46
<TOTAL-LIABILITIES> 46
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 254611
<SHARES-COMMON-STOCK> 7743
<SHARES-COMMON-PRIOR> 8619
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (6)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1
<NET-ASSETS> 7741
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4031
<OTHER-INCOME> 0
<EXPENSES-NET> 282
<NET-INVESTMENT-INCOME> 3749
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 1
<NET-CHANGE-FROM-OPS> 3750
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (113)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3607
<NUMBER-OF-SHARES-REDEEMED> (4580)
<SHARES-REINVESTED> 97
<NET-CHANGE-IN-ASSETS> (22875)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (6)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 270
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 282
<AVERAGE-NET-ASSETS> 8932
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .013
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.013)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> .005
[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> 0000878734
<NAME> DREYFUS NEW YORK MUNICIPAL CASH MUNICIPAL
<SERIES>
<NUMBER> 003
<NAME> ADMINISTRATIVE SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> JAN-31-1999
<PERIOD-END> JUL-31-1999
<INVESTMENTS-AT-COST> 250222
<INVESTMENTS-AT-VALUE> 250222
<RECEIVABLES> 1359
<ASSETS-OTHER> 3070
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 254652
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 46
<TOTAL-LIABILITIES> 46
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 254611
<SHARES-COMMON-STOCK> 0
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (6)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1
<NET-ASSETS> 0
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4031
<OTHER-INCOME> 0
<EXPENSES-NET> 282
<NET-INVESTMENT-INCOME> 3749
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 1
<NET-CHANGE-FROM-OPS> 3750
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (22875)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (6)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 270
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 282
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .013
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.013)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> .003
[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> 0000878734
<NAME> DREYFUS NEW YORK MUNICIPAL CASH MANAGEMENT
<SERIES>
<NUMBER> 004
<NAME> PARTICIPANT SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> JAN-31-1999
<PERIOD-END> JUL-31-1999
<INVESTMENTS-AT-COST> 250222
<INVESTMENTS-AT-VALUE> 250222
<RECEIVABLES> 1359
<ASSETS-OTHER> 3070
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 254652
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 46
<TOTAL-LIABILITIES> 46
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 254611
<SHARES-COMMON-STOCK> 441
<SHARES-COMMON-PRIOR> 619
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (6)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1
<NET-ASSETS> 440
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4031
<OTHER-INCOME> 0
<EXPENSES-NET> 282
<NET-INVESTMENT-INCOME> 3749
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 1
<NET-CHANGE-FROM-OPS> 3750
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 276
<NUMBER-OF-SHARES-REDEEMED> (458)
<SHARES-REINVESTED> 4
<NET-CHANGE-IN-ASSETS> 22875
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (6)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 270
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 282
<AVERAGE-NET-ASSETS> 378
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .012
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.012)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> .006
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>