[ARTICLE] 6
[CIK] 0000943309
[NAME] SMITH BARNEY INSTITUTIONAL CASH MANAGEMENT FUND INC.
[SERIES]
   [NUMBER] 3
   [NAME] MUNICIPAL MONEY MARKET PORTFOLIO
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   YEAR
[FISCAL-YEAR-END]                          MAY-31-1999
[PERIOD-END]                               MAY-31-1999
[INVESTMENTS-AT-COST]                      304,536,269
[INVESTMENTS-AT-VALUE]                     304,536,269
[RECEIVABLES]                                9,898,762
[ASSETS-OTHER]                                  53,084
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                             314,488,115
[PAYABLE-FOR-SECURITIES]                     2,011,560
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                      933,318
[TOTAL-LIABILITIES]                          2,944,878
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                   311,544,778
[SHARES-COMMON-STOCK]                      311,544,338
[SHARES-COMMON-PRIOR]                       85,670,997
[ACCUMULATED-NII-CURRENT]                            0
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                        (1,541)
[OVERDISTRIBUTION-GAINS]                             0
[ACCUM-APPREC-OR-DEPREC]                             0
[NET-ASSETS]                               311,543,237
[DIVIDEND-INCOME]                                    0
[INTEREST-INCOME]                            4,531,579
[OTHER-INCOME]                                       0
[EXPENSES-NET]                                 312,458
[NET-INVESTMENT-INCOME]                      4,219,121
[REALIZED-GAINS-CURRENT]                         (184)
[APPREC-INCREASE-CURRENT]                            0
[NET-CHANGE-FROM-OPS]                        4,218,937
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                    4,219,987
[DISTRIBUTIONS-OF-GAINS]                             0
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                  1,654,103,348
[NUMBER-OF-SHARES-REDEEMED]              1,431,629,386
[SHARES-REINVESTED]                          3,399,379
[NET-CHANGE-IN-ASSETS]                     225,872,291
[ACCUMULATED-NII-PRIOR]                              0
[ACCUMULATED-GAINS-PRIOR]                            0
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                           0
[GROSS-ADVISORY-FEES]                          368,395
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                531,852
[AVERAGE-NET-ASSETS]                       136,442,529
[PER-SHARE-NAV-BEGIN]                             1.00
[PER-SHARE-NII]                                   1.03
[PER-SHARE-GAIN-APPREC]                              0
[PER-SHARE-DIVIDEND]                              0.03
[PER-SHARE-DISTRIBUTIONS]                            0
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                               1.00
[EXPENSE-RATIO]                                   0.23
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>