<PAGE> PAGE 1
000 A000000 07/31/98
000 C000000 0000878734
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 DREYFUS NEW YORK MUNICIPAL CASH MANAGEMENT
001 B000000 811-6395
001 C000000 2129226754
002 A000000 200 PARK AVENUE
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10166
002 D020000 0144
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
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
015 C010003 NEW YORK
015 C020003 NY
015 C030003 10041
015 E010003 X
018 000000 Y
019 A000000 Y
019 B000000 160
019 C000000 DREYFUSFAM
022 A000001 SALOMON SMITH BARNEY
022 B000001 13-1912900
022 C000001 117353
022 D000001 45559
022 A000002 GOLDMAN, SACHS & CO.
022 B000002 13-5108880
<PAGE> PAGE 2
022 C000002 34100
022 D000002 47700
022 A000003 CITICORP SECURITIES INC.
022 B000003 13-2771536
022 C000003 45400
022 D000003 33100
022 A000004 LEHMAN BROTHERS INC.
022 B000004 13-2518466
022 C000004 36800
022 D000004 28600
022 A000005 BANK OF NEW YORK (THE)
022 B000005 13-5160382
022 C000005 20200
022 D000005 20200
022 A000006 PRUDENTIAL SECURITIES INCORPORATED
022 B000006 22-2347336
022 C000006 11500
022 D000006 26750
022 A000007 BEAR, STEARNS & CO. INC.
022 B000007 13-3299429
022 C000007 17000
022 D000007 17500
022 A000008 PAINEWEBBER INCORPORATED
022 B000008 13-2638166
022 C000008 12200
022 D000008 21700
022 A000009 FIRST ALBANY CORPORATION
022 B000009 14-1391446
022 C000009 22751
022 D000009 9000
022 A000010 FIRST CHICAGO INVESTMENT SECURITIES, INC.
022 B000010 36-0899825
022 C000010 14200
022 D000010 14200
023 C000000 357004
023 D000000 269609
028 A010000 94098
028 A020000 132
028 A030000 0
028 A040000 84986
028 B010000 71117
028 B020000 147
028 B030000 0
028 B040000 77495
028 C010000 181551
028 C020000 171
028 C030000 0
028 C040000 193488
028 D010000 161220
028 D020000 179
028 D030000 0
<PAGE> PAGE 3
028 D040000 177195
028 E010000 140132
028 E020000 156
028 E030000 0
028 E040000 118218
028 F010000 142540
028 F020000 147
028 F030000 0
028 F040000 132011
028 G010000 790658
028 G020000 932
028 G030000 0
028 G040000 783393
028 H000000 0
037 000000 N
038 000000 0
039 000000 N
040 000000 Y
041 000000 Y
042 A000000 52
042 B000000 0
042 C000000 48
042 D000000 0
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 18
044 000000 0
049 000000 N
050 000000 N
051 000000 N
052 000000 N
053 A000000 Y
053 B000000 Y
053 C000000 N
055 A000000 Y
055 B000000 N
056 000000 N
057 000000 N
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
<PAGE> PAGE 4
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 47
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
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
<PAGE> PAGE 5
070 R020000 N
071 A000000 0
071 B000000 0
071 C000000 0
071 D000000 0
072 A000000 6
072 B000000 3555
072 C000000 0
072 D000000 0
072 E000000 0
072 F000000 207
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 18
072 U000000 0
072 V000000 0
072 W000000 0
072 X000000 225
072 Y000000 0
072 Z000000 3330
072AA000000 1
072BB000000 0
072CC010000 0
072CC020000 0
072DD010000 3120
072DD020000 210
072EE000000 0
073 A010000 0.0000
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 2208
074 B000000 0
074 C000000 213929
074 D000000 0
074 E000000 0
074 F000000 0
074 G000000 0
074 H000000 0
074 I000000 0
<PAGE> PAGE 6
074 J000000 0
074 K000000 0
074 L000000 1458
074 M000000 0
074 N000000 217595
074 O000000 0
074 P000000 46
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 1
074 S000000 0
074 T000000 217548
074 U010000 204438
074 U020000 13115
074 V010000 1.00
074 V020000 0.00
074 W000000 1.0000
074 X000000 856
074 Y000000 0
075 A000000 194595
075 B000000 0
076 000000 0.00
077 A000000 N
078 000000 N
SIGNATURE MICHAEL S. PETRUCELLI
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000878734
<NAME> DREYFUS NEW YORK MUNCIPAL CASH MANAGEMENT
<SERIES>
<NUMBER> 1
<NAME> INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JAN-31-1999
<PERIOD-END> JUL-31-1998
<INVESTMENTS-AT-COST> 213929
<INVESTMENTS-AT-VALUE> 213929
<RECEIVABLES> 1458
<ASSETS-OTHER> 2208
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 217595
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 47
<TOTAL-LIABILITIES> 47
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 217553
<SHARES-COMMON-STOCK> 204438
<SHARES-COMMON-PRIOR> 195667
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (5)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 204434
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3555
<OTHER-INCOME> 0
<EXPENSES-NET> 225
<NET-INVESTMENT-INCOME> 3330
<REALIZED-GAINS-CURRENT> 1
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 3331
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3120)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 787811
<NUMBER-OF-SHARES-REDEEMED> (779762)
<SHARES-REINVESTED> 722
<NET-CHANGE-IN-ASSETS> 8198
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (6)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 207
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 225
<AVERAGE-NET-ASSETS> 194595
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .016
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.016)
<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>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000878734
<NAME> DREYFUS NEW YORK MUNCIPAL CASH MANAGEMENT
<SERIES>
<NUMBER> 2
<NAME> INVESTOR SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JAN-31-1999
<PERIOD-END> JUL-31-1998
<INVESTMENTS-AT-COST> 213929
<INVESTMENTS-AT-VALUE> 213929
<RECEIVABLES> 1458
<ASSETS-OTHER> 2208
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 217595
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 47
<TOTAL-LIABILITIES> 47
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 217553
<SHARES-COMMON-STOCK> 12580
<SHARES-COMMON-PRIOR> 13042
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (5)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 12578
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3555
<OTHER-INCOME> 0
<EXPENSES-NET> 225
<NET-INVESTMENT-INCOME> 3330
<REALIZED-GAINS-CURRENT> 1
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 3331
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (202)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2295
<NUMBER-OF-SHARES-REDEEMED> (2959)
<SHARES-REINVESTED> 202
<NET-CHANGE-IN-ASSETS> 8198
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (6)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 207
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 225
<AVERAGE-NET-ASSETS> 13581
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .015
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.015)
<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>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000878734
<NAME> DREYFUS NEW YORK MUNCIPAL CASH MANAGEMENT
<SERIES>
<NUMBER> 3
<NAME> ADMINISTRATIVE SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JAN-31-1999
<PERIOD-END> JUL-31-1998
<INVESTMENTS-AT-COST> 213929
<INVESTMENTS-AT-VALUE> 213929
<RECEIVABLES> 1458
<ASSETS-OTHER> 2208
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 217595
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 47
<TOTAL-LIABILITIES> 47
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 217553
<SHARES-COMMON-STOCK> 0
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (5)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 0
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3555
<OTHER-INCOME> 0
<EXPENSES-NET> 225
<NET-INVESTMENT-INCOME> 3330
<REALIZED-GAINS-CURRENT> 1
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 3331
<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> 8198
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (6)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 207
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 225
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .016
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.016)
<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>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000878734
<NAME> DREYFUS NEW YORK MUNCIPAL CASH MANAGEMENT
<SERIES>
<NUMBER> 4
<NAME> PARTICIPANT SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JAN-31-1999
<PERIOD-END> JUL-31-1998
<INVESTMENTS-AT-COST> 213929
<INVESTMENTS-AT-VALUE> 213929
<RECEIVABLES> 1458
<ASSETS-OTHER> 2208
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 217595
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 47
<TOTAL-LIABILITIES> 47
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 217553
<SHARES-COMMON-STOCK> 535
<SHARES-COMMON-PRIOR> 647
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (5)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 536
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3555
<OTHER-INCOME> 0
<EXPENSES-NET> 225
<NET-INVESTMENT-INCOME> 3330
<REALIZED-GAINS-CURRENT> 1
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 3331
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (8)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 552
<NUMBER-OF-SHARES-REDEEMED> (672)
<SHARES-REINVESTED> 8
<NET-CHANGE-IN-ASSETS> 8198
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (6)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 207
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 225
<AVERAGE-NET-ASSETS> 575
<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> .006
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
