WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<RESTATED>
<CIK> 0000883044
<NAME> NUVEEN TAX-FREE UNIT TRUST
<SERIES> Series 718
<NAME> FLORIDA INSURED TRUST
<NUMBER> 186
<MULTIPLIER> 1
<CURRENCY> U.S. DOLLARS
<FISCAL-YEAR-END> FEB-29-2000
<PERIOD-START> MAR-01-1999
<PERIOD-END> FEB-29-2000
<PERIOD-TYPE> YEAR
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 2,144,939
<INVESTMENTS-AT-VALUE> 2,122,477
<RECEIVABLES> 37,274
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2,159,751
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,979
<TOTAL-LIABILITIES> 4,979
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 0
<SHARES-COMMON-STOCK> 22,356
<SHARES-COMMON-PRIOR> 24,009
<ACCUMULATED-NII-CURRENT> 32,679
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 6,167
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> -22,462
<NET-ASSETS> 2,154,772
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 132,294
<OTHER-INCOME> 0
<EXPENSES-NET> 3,976
<NET-INVESTMENT-INCOME> 128,318
<REALIZED-GAINS-CURRENT> 7,327
<APPREC-INCREASE-CURRENT> -207,388
<NET-CHANGE-FROM-OPS> -71,743
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 130,733
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 30,000
<NUMBER-OF-SHARES-REDEEMED> 7,644
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> -358,916
<ACCUMULATED-NII-PRIOR> 35,096
<ACCUMULATED-GAINS-PRIOR> -1,161
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 0
<PER-SHARE-NII> 0
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 0
<EXPENSE-RATIO> 0
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
