WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000775370
[CIK] Smith Barney Muni Funds, Inc.
<SERIES>
   <NUMBER>001
<NAME> SB Muni Funds National Portfolio

<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                               Mar-30-2001
<PERIOD-END>                                    Sep-30-2000
<INVESTMENTS-AT-COST>                           419,166,411
<INVESTMENTS-AT-VALUE>                          428,134,520
<RECEIVABLES>                                    10,371,586
<ASSETS-OTHER>                                       83,104
<OTHER-ITEMS-ASSETS>                                      0
<TOTAL-ASSETS>                                  438,589,210
<PAYABLE-FOR-SECURITIES>                         10,048,658
<SENIOR-LONG-TERM-DEBT>                                   0
<OTHER-ITEMS-LIABILITIES>                         2,253,709
<TOTAL-LIABILITIES>                              12,302,367
<SENIOR-EQUITY>                                           0
<PAID-IN-CAPITAL-COMMON>                        427,522,486
<SHARES-COMMON-STOCK>                             1,503,523
<SHARES-COMMON-PRIOR>                             1,500,956
<ACCUMULATED-NII-CURRENT>                           335,347
<OVERDISTRIBUTION-NII>                                    0
<ACCUMULATED-NET-GAINS>                         (10,539,099)
<OVERDISTRIBUTION-GAINS>                                  0
<ACCUM-APPREC-OR-DEPREC>                          8,968,109
<NET-ASSETS>                                    426,286,843
<DIVIDEND-INCOME>                                         0
<INTEREST-INCOME>                                13,894,059
<OTHER-INCOME>                                            0
<EXPENSES-NET>                                    1,602,403
<NET-INVESTMENT-INCOME>                          12,291,656
<REALIZED-GAINS-CURRENT>                         (1,117,858)
<APPREC-INCREASE-CURRENT>                         4,031,250
<NET-CHANGE-FROM-OPS>                            15,205,048
<EQUALIZATION>                                            0
<DISTRIBUTIONS-OF-INCOME>                           489,740
<DISTRIBUTIONS-OF-GAINS>                                  0
<DISTRIBUTIONS-OTHER>                                     0
<NUMBER-OF-SHARES-SOLD>                             137,425
<NUMBER-OF-SHARES-REDEEMED>                         156,250
<SHARES-REINVESTED>                                  21,392
<NET-CHANGE-IN-ASSETS>                              169,101
<ACCUMULATED-NII-PRIOR>                             289,999
<ACCUMULATED-GAINS-PRIOR>                        (9,421,241)
<OVERDISTRIB-NII-PRIOR>                                   0
<OVERDIST-NET-GAINS-PRIOR>                                0
<GROSS-ADVISORY-FEES>                               957,841
<INTEREST-EXPENSE>                                        0
<GROSS-EXPENSE>                                   1,602,403
<AVERAGE-NET-ASSETS>                             19,619,793
<PER-SHARE-NAV-BEGIN>                                12.950
<PER-SHARE-NII>                                       0.340
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<RETURNS-OF-CAPITAL>                                  0.000
<PER-SHARE-NAV-END>                                  13.030
<EXPENSE-RATIO>                                        1.22



</TABLE>