[ARTICLE] 6
[CIK] 0000809991
[NAME] PAINEWEBBER MUNICIPAL SERIES
[SERIES]
[NUMBER] 1
[NAME] MUNICIPAL HIGH INCOME CLASS B
[MULTIPLIER] 1000
<TABLE>
<S> <C>
[PERIOD-TYPE] 6-MOS
[FISCAL-YEAR-END] FEB-28-2001
[PERIOD-START] MAR-01-2000
[PERIOD-END] AUG-31-2000
[INVESTMENTS-AT-COST] 12992
[INVESTMENTS-AT-VALUE] 12412
[RECEIVABLES] 247
[ASSETS-OTHER] 14
[OTHER-ITEMS-ASSETS] 8
[TOTAL-ASSETS] 12681
[PAYABLE-FOR-SECURITIES] 0
[SENIOR-LONG-TERM-DEBT] 0
[OTHER-ITEMS-LIABILITIES] 35
[TOTAL-LIABILITIES] 35
[SENIOR-EQUITY] 0
[PAID-IN-CAPITAL-COMMON] 13335
[SHARES-COMMON-STOCK] 1276
[SHARES-COMMON-PRIOR] 1421
[ACCUMULATED-NII-CURRENT] 0
[OVERDISTRIBUTION-NII] 0
[ACCUMULATED-NET-GAINS] (108)
[OVERDISTRIBUTION-GAINS] 0
[ACCUM-APPREC-OR-DEPREC] (581)
[NET-ASSETS] 12646
[DIVIDEND-INCOME] 0
[INTEREST-INCOME] 445
[OTHER-INCOME] 0
[EXPENSES-NET] (127)
[NET-INVESTMENT-INCOME] 318
[REALIZED-GAINS-CURRENT] (1)
[APPREC-INCREASE-CURRENT] 67
[NET-CHANGE-FROM-OPS] 384
[EQUALIZATION] 0
[DISTRIBUTIONS-OF-INCOME] (318)
[DISTRIBUTIONS-OF-GAINS] 0
[DISTRIBUTIONS-OTHER] 0
[NUMBER-OF-SHARES-SOLD] 123
[NUMBER-OF-SHARES-REDEEMED] (285)
[SHARES-REINVESTED] 17
[NET-CHANGE-IN-ASSETS] (1344)
[ACCUMULATED-NII-PRIOR] 0
[ACCUMULATED-GAINS-PRIOR] (112)
[OVERDISTRIB-NII-PRIOR] 0
[OVERDIST-NET-GAINS-PRIOR] 0
[GROSS-ADVISORY-FEES] 40
[INTEREST-EXPENSE] 0
[GROSS-EXPENSE] 127
[AVERAGE-NET-ASSETS] 13326
[PER-SHARE-NAV-BEGIN] 9.85
[PER-SHARE-NII] 0.24
[PER-SHARE-GAIN-APPREC] 0.06
[PER-SHARE-DIVIDEND] (0.24)
[PER-SHARE-DISTRIBUTIONS] 0
[RETURNS-OF-CAPITAL] 0
[PER-SHARE-NAV-END] 9.91
[EXPENSE-RATIO] 1.89
</TABLE>
