<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000816153
<NAME> THORNBURG INVESTMENT TRUST
<SERIES>
<NUMBER> 6
<NAME> THORNBURG FLORIDA INTERMEDIATE MUNICIPAL FUND (A)
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> SEP-30-2000
<PERIOD-END> SEP-30-2000
<INVESTMENTS-AT-COST> 24,860,001
<INVESTMENTS-AT-VALUE> 25,211,421
<RECEIVABLES> 659,621
<ASSETS-OTHER> 103,392
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 25,974,434
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 98,559
<TOTAL-LIABILITIES> 98,559
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 26,310,131
<SHARES-COMMON-STOCK> 2,205,530
<SHARES-COMMON-PRIOR> 2,563,502
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (785,676)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 351,420
<NET-ASSETS> 25,875,875
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,560,944
<OTHER-INCOME> 0
<EXPENSES-NET> (274,766)
<NET-INVESTMENT-INCOME> 1,286,178
<REALIZED-GAINS-CURRENT> (418,323)
<APPREC-INCREASE-CURRENT> 242,221
<NET-CHANGE-FROM-OPS> 1,110,076
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,286,178)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,166,726
<NUMBER-OF-SHARES-REDEEMED> 49,310
<SHARES-REINVESTED> (1,574,008)
<NET-CHANGE-IN-ASSETS> (4,345,213)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (367,353)
<OVERDISTRIB-NII-PRIOR> 0
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<GROSS-ADVISORY-FEES> 139,729
<INTEREST-EXPENSE> 0
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<AVERAGE-NET-ASSETS> 27,935,276
<PER-SHARE-NAV-BEGIN> 11.79
<PER-SHARE-NII> .54
<PER-SHARE-GAIN-APPREC> (.06)
<PER-SHARE-DIVIDEND> (.54)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.73
<EXPENSE-RATIO> .98
</TABLE>
