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SIGNATURE IRVING P. DAVID
TITLE CONTROLLER
[ARTICLE] 6
[CIK] 0000320282
[NAME] SMITH BARNEY MUNICIPAL MONEY MARKET FUND, INC. CLASS A
<TABLE>
<S> <C>
[PERIOD-TYPE] YEAR
[FISCAL-YEAR-END] MAR-31-1997
[PERIOD-END] MAR-31-1997
[INVESTMENTS-AT-COST] 5,488,577,006
[INVESTMENTS-AT-VALUE] 5,488,577,006
[RECEIVABLES] 88,345,381
[ASSETS-OTHER] 161,111
[OTHER-ITEMS-ASSETS] 0
[TOTAL-ASSETS] 5,577,083,498
[PAYABLE-FOR-SECURITIES] 0
[SENIOR-LONG-TERM-DEBT] 0
[OTHER-ITEMS-LIABILITIES] 10,166,511
[TOTAL-LIABILITIES] 10,166,511
[SENIOR-EQUITY] 0
[PAID-IN-CAPITAL-COMMON] 0
[SHARES-COMMON-STOCK] 5,563,148,329
[SHARES-COMMON-PRIOR] 4,914,872,899
[ACCUMULATED-NII-CURRENT] 0
[OVERDISTRIBUTION-NII] 0
[ACCUMULATED-NET-GAINS] 0
[OVERDISTRIBUTION-GAINS] 0
[ACCUM-APPREC-OR-DEPREC] 0
[NET-ASSETS] 5,566,916,987
[DIVIDEND-INCOME] 0
[INTEREST-INCOME] 192,373,989
[OTHER-INCOME] 0
[EXPENSES-NET] 36,099,734
[NET-INVESTMENT-INCOME] 156,274,255
[REALIZED-GAINS-CURRENT] 0
[APPREC-INCREASE-CURRENT] 0
[NET-CHANGE-FROM-OPS] 156,205,821
[EQUALIZATION] 0
[DISTRIBUTIONS-OF-INCOME] 155,610,802
[DISTRIBUTIONS-OF-GAINS] 0
[DISTRIBUTIONS-OTHER] 0
[NUMBER-OF-SHARES-SOLD] 22,921,128,655
[NUMBER-OF-SHARES-REDEEMED] 22,908,963,488
[SHARES-REINVESTED] 154,549,067
[NET-CHANGE-IN-ASSETS] 153,563,358
[ACCUMULATED-NII-PRIOR] 0
[ACCUMULATED-GAINS-PRIOR] 0
[OVERDISTRIB-NII-PRIOR] 0
[OVERDIST-NET-GAINS-PRIOR] 0
[GROSS-ADVISORY-FEES] 26,073,153
[INTEREST-EXPENSE] 0
[GROSS-EXPENSE] 36,099,734
[AVERAGE-NET-ASSETS] 5,368,552,481
[PER-SHARE-NAV-BEGIN] 1.00
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[PER-SHARE-DIVIDEND] (.029)
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[RETURNS-OF-CAPITAL] 0
[PER-SHARE-NAV-END] 1.00
[EXPENSE-RATIO] 0.67
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
[ARTICLE] 6
[CIK] 0000320282
[NAME] SMITH BARNEY MUNICIPAL MONEY MARKET FUND, INC. CLASS C
<TABLE>
<S> <C>
[PERIOD-TYPE] YEAR
[FISCAL-YEAR-END] MAR-31-1997
[PERIOD-END] MAR-31-1997
[INVESTMENTS-AT-COST] 5,488,577,006
[INVESTMENTS-AT-VALUE] 5,488,577,006
[RECEIVABLES] 88,345,381
[ASSETS-OTHER] 161,111
[OTHER-ITEMS-ASSETS] 0
[TOTAL-ASSETS] 5,577,083,498
[PAYABLE-FOR-SECURITIES] 0
[SENIOR-LONG-TERM-DEBT] 0
[OTHER-ITEMS-LIABILITIES] 10,166,511
[TOTAL-LIABILITIES] 10,166,511
[SENIOR-EQUITY] 0
[PAID-IN-CAPITAL-COMMON] 0
[SHARES-COMMON-STOCK] 15,121
[SHARES-COMMON-PRIOR] 59,379
[ACCUMULATED-NII-CURRENT] 0
[OVERDISTRIBUTION-NII] 0
[ACCUMULATED-NET-GAINS] 0
[OVERDISTRIBUTION-GAINS] 0
[ACCUM-APPREC-OR-DEPREC] 0
[NET-ASSETS] 5,566,916,987
[DIVIDEND-INCOME] 0
[INTEREST-INCOME] 192,373,989
[OTHER-INCOME] 0
[EXPENSES-NET] 36,099,734
[NET-INVESTMENT-INCOME] 156,274,255
[REALIZED-GAINS-CURRENT] 0
[APPREC-INCREASE-CURRENT] 0
[NET-CHANGE-FROM-OPS] 156,205,821
[EQUALIZATION] 0
[DISTRIBUTIONS-OF-INCOME] 3,931
[DISTRIBUTIONS-OF-GAINS] 0
[DISTRIBUTIONS-OTHER] 0
[NUMBER-OF-SHARES-SOLD] 199,991
[NUMBER-OF-SHARES-REDEEMED] 232,619
[SHARES-REINVESTED] 3,890
[NET-CHANGE-IN-ASSETS] 153,563,358
[ACCUMULATED-NII-PRIOR] 0
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[OVERDISTRIB-NII-PRIOR] 0
[OVERDIST-NET-GAINS-PRIOR] 0
[GROSS-ADVISORY-FEES] 26,073,153
[INTEREST-EXPENSE] 0
[GROSS-EXPENSE] 36,099,734
[AVERAGE-NET-ASSETS] 135,902
[PER-SHARE-NAV-BEGIN] 1.00
[PER-SHARE-NII] .029
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[PER-SHARE-DIVIDEND] (.029)
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[PER-SHARE-NAV-END] 1.00
[EXPENSE-RATIO] 0.67
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
[ARTICLE] 6
[CIK] 0000320282
[NAME] SMITH BARNEY MUNICIPAL MONEY MARKET FUND, INC. CLASS Y
<TABLE>
<S> <C>
[PERIOD-TYPE] YEAR
[FISCAL-YEAR-END] MAR-31-1997
[PERIOD-END] MAR-31-1997
[INVESTMENTS-AT-COST] 5,488,577,006
[INVESTMENTS-AT-VALUE] 5,488,577,006
[RECEIVABLES] 88,345,381
[ASSETS-OTHER] 161,111
[OTHER-ITEMS-ASSETS] 0
[TOTAL-ASSETS] 5,577,083,498
[PAYABLE-FOR-SECURITIES] 0
[SENIOR-LONG-TERM-DEBT] 0
[OTHER-ITEMS-LIABILITIES] 10,166,511
[TOTAL-LIABILITIES] 10,166,511
[SENIOR-EQUITY] 0
[PAID-IN-CAPITAL-COMMON] 0
[SHARES-COMMON-STOCK] 4,755,401
[SHARES-COMMON-PRIOR] 0
[ACCUMULATED-NII-CURRENT] 0
[OVERDISTRIBUTION-NII] 0
[ACCUMULATED-NET-GAINS] 0
[OVERDISTRIBUTION-GAINS] 0
[ACCUM-APPREC-OR-DEPREC] 0
[NET-ASSETS] 5,566,916,987
[DIVIDEND-INCOME] 0
[INTEREST-INCOME] 192,373,989
[OTHER-INCOME] 0
[EXPENSES-NET] 36,099,734
[NET-INVESTMENT-INCOME] 156,274,255
[REALIZED-GAINS-CURRENT] 0
[APPREC-INCREASE-CURRENT] 0
[NET-CHANGE-FROM-OPS] 156,205,821
[EQUALIZATION] 0
[DISTRIBUTIONS-OF-INCOME] 659,522
[DISTRIBUTIONS-OF-GAINS] 0
[DISTRIBUTIONS-OTHER] 0
[NUMBER-OF-SHARES-SOLD] 92,552,190
[NUMBER-OF-SHARES-REDEEMED] 106,276,754
[SHARES-REINVESTED] 670,860
[NET-CHANGE-IN-ASSETS] 153,563,358
[ACCUMULATED-NII-PRIOR] 0
[ACCUMULATED-GAINS-PRIOR] 0
[OVERDISTRIB-NII-PRIOR] 0
[OVERDIST-NET-GAINS-PRIOR] 0
[GROSS-ADVISORY-FEES] 26,073,153
[INTEREST-EXPENSE] 0
[GROSS-EXPENSE] 36,099,734
[AVERAGE-NET-ASSETS] 22,011,994
[PER-SHARE-NAV-BEGIN] 1.00
[PER-SHARE-NII] .030
[PER-SHARE-GAIN-APPREC] 0
[PER-SHARE-DIVIDEND] (.030)
[PER-SHARE-DISTRIBUTIONS] 0
[RETURNS-OF-CAPITAL] 0
[PER-SHARE-NAV-END] 1.00
[EXPENSE-RATIO] 0.57
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
