[ARTICLE] 6
[CIK] 0000320282
[NAME] SMITH BARNEY MUNICIPALS MONEY MARKET FUND, INC. CLASS Y
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   6-MOS
[FISCAL-YEAR-END]                          MAR-31-1998
[PERIOD-END]                               SEP-30-1997
[INVESTMENTS-AT-COST]                        5,676,795
[INVESTMENTS-AT-VALUE]                   5,676,795,198
[RECEIVABLES]                               58,222,042
[ASSETS-OTHER]                                       0
[OTHER-ITEMS-ASSETS]                            72,418
[TOTAL-ASSETS]                           5,735,089,658
[PAYABLE-FOR-SECURITIES]                   154,500,250
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                   11,758,643
[TOTAL-LIABILITIES]                        166,258,893
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                 5,570,014,636
[SHARES-COMMON-STOCK]                        4,217,006
[SHARES-COMMON-PRIOR]                        4,755,401
[ACCUMULATED-NII-CURRENT]                            0
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                    (1,183,871)
[OVERDISTRIBUTION-GAINS]                             0
[ACCUM-APPREC-OR-DEPREC]                             0
[NET-ASSETS]                             5,568,830,765
[DIVIDEND-INCOME]                                    0
[INTEREST-INCOME]                          106,391,703
[OTHER-INCOME]                                       0
[EXPENSES-NET]                              17,952,815
[NET-INVESTMENT-INCOME]                     88,438,888
[REALIZED-GAINS-CURRENT]                       176,984
[APPREC-INCREASE-CURRENT]                            0
[NET-CHANGE-FROM-OPS]                       88,615,872
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                       78,224
[DISTRIBUTIONS-OF-GAINS]                             0
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                      4,995,192
[NUMBER-OF-SHARES-REDEEMED]                  5,611,115
[SHARES-REINVESTED]                             77,528
[NET-CHANGE-IN-ASSETS]                       1,913,778
[ACCUMULATED-NII-PRIOR]                              0
[ACCUMULATED-GAINS-PRIOR]                  (1,360,855)
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                           0
[GROSS-ADVISORY-FEES]                       13,534,623
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                             17,952,815
[AVERAGE-NET-ASSETS]                         4,819,130
[PER-SHARE-NAV-BEGIN]                             1.00
[PER-SHARE-NII]                                  0.016
[PER-SHARE-GAIN-APPREC]                              0
[PER-SHARE-DIVIDEND]                             0.016
[PER-SHARE-DISTRIBUTIONS]                            0
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                               1.00
[EXPENSE-RATIO]                                   0.54
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>