[ARTICLE] 6
[CIK] 0000830487
[NAME] MUNICIPAL HIGH INCOME FUND INC.
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   YEAR
[FISCAL-YEAR-END]                          OCT-31-1997
[PERIOD-END]                               OCT-31-1997
[INVESTMENTS-AT-COST]                      179,490,677
[INVESTMENTS-AT-VALUE]                     192,022,200
[RECEIVABLES]                                4,505,499
[ASSETS-OTHER]                                  79,352
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                             196,607,051
[PAYABLE-FOR-SECURITIES]                     2,239,160
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                      234,598
[TOTAL-LIABILITIES]                          2,473,758
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                   185,007,253
[SHARES-COMMON-STOCK]                       19,885,306
[SHARES-COMMON-PRIOR]                       19,659,882
[ACCUMULATED-NII-CURRENT]                      136,698
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                    (3,542,181)
[OVERDISTRIBUTION-GAINS]                             0
[ACCUM-APPREC-OR-DEPREC]                    12,531,523
[NET-ASSETS]                               194,133,293
[DIVIDEND-INCOME]                                    0
[INTEREST-INCOME]                           13,493,658
[OTHER-INCOME]                                       0
[EXPENSES-NET]                               1,411,050
[NET-INVESTMENT-INCOME]                     12,082,608
[REALIZED-GAINS-CURRENT]                     (388,613)
[APPREC-INCREASE-CURRENT]                    5,290,943
[NET-CHANGE-FROM-OPS]                       16,973,938
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                   12,281,068
[DISTRIBUTIONS-OF-GAINS]                             0
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                              0
[NUMBER-OF-SHARES-REDEEMED]                          0
[SHARES-REINVESTED]                          2,136,996
[NET-CHANGE-IN-ASSETS]                       6,829,866
[ACCUMULATED-NII-PRIOR]                        335,158
[ACCUMULATED-GAINS-PRIOR]                  (3,142,568)
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                           0
[GROSS-ADVISORY-FEES]                        1,136,844
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                              1,411,050
[AVERAGE-NET-ASSETS]                       189,492,720
[PER-SHARE-NAV-BEGIN]                             9.53
[PER-SHARE-NII]                                   0.61
[PER-SHARE-GAIN-APPREC]                           0.24
[PER-SHARE-DIVIDEND]                              0.62
[PER-SHARE-DISTRIBUTIONS]                            0
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                               9.76
[EXPENSE-RATIO]                                   0.74
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>