<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW INSURED MUNICIPAL TRUST
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-END> APR-30-2000
<INVESTMENTS-AT-COST> 425,732,527
<INVESTMENTS-AT-VALUE> 443,126,177
<RECEIVABLES> 0
<ASSETS-OTHER> 7,517,116
<OTHER-ITEMS-ASSETS> 208,813
<TOTAL-ASSETS> 450,852,106
<PAYABLE-FOR-SECURITIES> (2,826,810)
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (440,012)
<TOTAL-LIABILITIES> (3,267,822)
<SENIOR-EQUITY> 130,000,000
<PAID-IN-CAPITAL-COMMON> 297,714,802
<SHARES-COMMON-STOCK> 21,393,313
<SHARES-COMMON-PRIOR> 22,177,613
<ACCUMULATED-NII-CURRENT> 2,648,680
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (172,848)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 17,393,650
<NET-ASSETS> 317,584,284
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 13,649,515
<OTHER-INCOME> 0
<EXPENSES-NET> (1,137,470)
<NET-INVESTMENT-INCOME> 12,512,045
<REALIZED-GAINS-CURRENT> 1,100,442
<APPREC-INCREASE-CURRENT> (3,832,174)
<NET-CHANGE-FROM-OPS> 9,780,313
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (10,122,668)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> (784,300)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (13,179,914)
<ACCUMULATED-NII-PRIOR> 2,758,247
<ACCUMULATED-GAINS-PRIOR> (1,273,290)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (791,451)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (1,148,738)
<AVERAGE-NET-ASSETS> 323,686,272
<PER-SHARE-NAV-BEGIN> 14.91
<PER-SHARE-NII> 0.58
<PER-SHARE-GAIN-APPREC> (0.05)
<PER-SHARE-DIVIDEND> (0.59)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.85
<EXPENSE-RATIO> 0.71
</TABLE>
