<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains Summary Financial Information extracted from the Form
N-SAR and the financial statements and is qualified in its entirety by
references to such documents.
</LEGEND>
<SERIES>
   <NUMBER> 022
   <NAME> NUVEEN FLAGSHIP COLORADO MUNICIPAL BOND FUND - CLASS B
<MULTIPLIER> 1000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          MAY-31-2000
<PERIOD-START>                             JUN-01-1999
<PERIOD-END>                               MAY-31-2000
<INVESTMENTS-AT-COST>                            42787
<INVESTMENTS-AT-VALUE>                           41973
<RECEIVABLES>                                      667
<ASSETS-OTHER>                                    1175
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   43815
<PAYABLE-FOR-SECURITIES>                          2062
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          318
<TOTAL-LIABILITIES>                               2380
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         43597
<SHARES-COMMON-STOCK>                              476
<SHARES-COMMON-PRIOR>                              414
<ACCUMULATED-NII-CURRENT>                         (41)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         (1307)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         (814)
<NET-ASSETS>                                     41435
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 2732
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     602
<NET-INVESTMENT-INCOME>                           2130
<REALIZED-GAINS-CURRENT>                        (1307)
<APPREC-INCREASE-CURRENT>                       (3795)
<NET-CHANGE-FROM-OPS>                           (2972)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          196
<DISTRIBUTIONS-OF-GAINS>                            12
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            161
<NUMBER-OF-SHARES-REDEEMED>                        111
<SHARES-REINVESTED>                                 12
<NET-CHANGE-IN-ASSETS>                          (5507)
<ACCUMULATED-NII-PRIOR>                              1
<ACCUMULATED-GAINS-PRIOR>                          116
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              242
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    606
<AVERAGE-NET-ASSETS>                              4572
<PER-SHARE-NAV-BEGIN>                            10.70
<PER-SHARE-NII>                                    .42
<PER-SHARE-GAIN-APPREC>                         (1.15)
<PER-SHARE-DIVIDEND>                             (.42)
<PER-SHARE-DISTRIBUTIONS>                        (.03)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.52
<EXPENSE-RATIO>                                   2.03


</TABLE>