[ARTICLE] 6
[CIK] 0000775370
[NAME] SMITH BARNEY MUNI FUNDS
[SERIES]
   [NUMBER] 1
   [NAME] NATIONAL PORTFOLIO, CLASS B
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   YEAR
[FISCAL-YEAR-END]                          MAR-31-1999
[PERIOD-END]                               MAR-31-1999
[INVESTMENTS-AT-COST]                      428,603,753
[INVESTMENTS-AT-VALUE]                     458,799,339
[RECEIVABLES]                                8,695,638
[ASSETS-OTHER]                                  33,251
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                             467,528,228
[PAYABLE-FOR-SECURITIES]                     7,754,101
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                      297,105
[TOTAL-LIABILITIES]                          8,051,206
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                   428,890,717
[SHARES-COMMON-STOCK]                        2,611,236
[SHARES-COMMON-PRIOR]                        1,434,762
[ACCUMULATED-NII-CURRENT]                      (6,771)
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                        100,490
[OVERDISTRIBUTION-GAINS]                             0
[ACCUM-APPREC-OR-DEPREC]                    30,492,586
[NET-ASSETS]                               459,477,022
[DIVIDEND-INCOME]                                    0
[INTEREST-INCOME]                           25,814,539
[OTHER-INCOME]                                       0
[EXPENSES-NET]                               3,161,692
[NET-INVESTMENT-INCOME]                     22,652,847
[REALIZED-GAINS-CURRENT]                     2,183,729
[APPREC-INCREASE-CURRENT]                  (2,091,457)
[NET-CHANGE-FROM-OPS]                       22,745,119
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                    1,399,226
[DISTRIBUTIONS-OF-GAINS]                       447,827
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                      1,355,808
[NUMBER-OF-SHARES-REDEEMED]                    251,968
[SHARES-REINVESTED]                             72,634
[NET-CHANGE-IN-ASSETS]                      52,325,345
[ACCUMULATED-NII-PRIOR]                        302,433
[ACCUMULATED-GAINS-PRIOR]                    4,285,154
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                           0
[GROSS-ADVISORY-FEES]                        1,976,562
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                              3,161,692
[AVERAGE-NET-ASSETS]                        28,883,137
[PER-SHARE-NAV-BEGIN]                            14.16
[PER-SHARE-NII]                                  00.67
[PER-SHARE-GAIN-APPREC]                          00.02
[PER-SHARE-DIVIDEND]                             00.68
[PER-SHARE-DISTRIBUTIONS]                        00.21
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                              13.96
[EXPENSE-RATIO]                                  01.16
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>