[ARTICLE] 6
[CIK] 0000830487
[NAME] MUNICIPAL HIGH INCOME FUND INC.
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   6-MOS
[FISCAL-YEAR-END]                          OCT-31-1998
[PERIOD-END]                               APR-30-1998
[INVESTMENTS-AT-COST]                      185,892,838
[INVESTMENTS-AT-VALUE]                     198,910,100
[RECEIVABLES]                                4,487,530
[ASSETS-OTHER]                                       0
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                             203,397,630
[PAYABLE-FOR-SECURITIES]                     6,437,989
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                      261,071
[TOTAL-LIABILITIES]                          6,699,060
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                   186,883,222
[SHARES-COMMON-STOCK]                       20,080,251
[SHARES-COMMON-PRIOR]                       19,885,306
[ACCUMULATED-NII-CURRENT]                    (126,722)
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                    (3,075,192)
[OVERDISTRIBUTION-GAINS]                             0
[ACCUM-APPREC-OR-DEPREC]                    13,017,262
[NET-ASSETS]                               196,698,570
[DIVIDEND-INCOME]                                    0
[INTEREST-INCOME]                            6,698,076
[OTHER-INCOME]                                       0
[EXPENSES-NET]                                 730,618
[NET-INVESTMENT-INCOME]                      5,967,458
[REALIZED-GAINS-CURRENT]                       466,989
[APPREC-INCREASE-CURRENT]                      485,739
[NET-CHANGE-FROM-OPS]                        6,920,186
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                    6,230,878
[DISTRIBUTIONS-OF-GAINS]                             0
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                              0
[NUMBER-OF-SHARES-REDEEMED]                          0
[SHARES-REINVESTED]                            194,945
[NET-CHANGE-IN-ASSETS]                       2,565,277
[ACCUMULATED-NII-PRIOR]                        136,698
[ACCUMULATED-GAINS-PRIOR]                  (3,542,181)
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                           0
[GROSS-ADVISORY-FEES]                          584,715
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                730,618
[AVERAGE-NET-ASSETS]                       196,534,427
[PER-SHARE-NAV-BEGIN]                             9.76
[PER-SHARE-NII]                                   0.30
[PER-SHARE-GAIN-APPREC]                           0.05
[PER-SHARE-DIVIDEND]                              0.31
[PER-SHARE-DISTRIBUTIONS]                            0
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                               9.80
[EXPENSE-RATIO]                                   0.75
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>