<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE ANNUAL REPORT OF AMERICAN CENTURY CALIFORNIA TAX-FREE & MUNICIPAL
FUNDS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.

<CIK> 0000717316
<NAME> AMERICAN CENTURY CALIFORNIA TAX-FREE & MUNICIPAL FUNDS

   <NUMBER> 61
   <NAME> CALIFORNIA INSURED TAX-FREE FUND

                                           
<PERIOD-TYPE>                                     YEAR
<FISCAL-YEAR-END>                                 AUG-31-2000
<PERIOD-END>                                      AUG-31-2000
<INVESTMENTS-AT-COST>                                          188,699,671
<INVESTMENTS-AT-VALUE>                                         196,325,244
<RECEIVABLES>                                                    4,132,237
<ASSETS-OTHER>                                                           0
<OTHER-ITEMS-ASSETS>                                                     0
<TOTAL-ASSETS>                                                 200,457,481
<PAYABLE-FOR-SECURITIES>                                           949,124
<SENIOR-LONG-TERM-DEBT>                                                  0
<OTHER-ITEMS-LIABILITIES>                                          835,413
<TOTAL-LIABILITIES>                                              1,784,537
<SENIOR-EQUITY>                                                    196,211
<PAID-IN-CAPITAL-COMMON>                                       192,653,316
<SHARES-COMMON-STOCK>                                           19,621,139
<SHARES-COMMON-PRIOR>                                           20,252,426
<ACCUMULATED-NII-CURRENT>                                       (1,802,156)
<OVERDISTRIBUTION-NII>                                                   0
<ACCUMULATED-NET-GAINS>                                          7,625,573
<OVERDISTRIBUTION-GAINS>                                                 0
<ACCUM-APPREC-OR-DEPREC>                                                 0
<NET-ASSETS>                                                   198,672,944
<DIVIDEND-INCOME>                                                        0
<INTEREST-INCOME>                                               11,182,751
<OTHER-INCOME>                                                           0
<EXPENSES-NET>                                                   1,013,819
<NET-INVESTMENT-INCOME>                                         10,168,932
<REALIZED-GAINS-CURRENT>                                        (1,412,516)
<APPREC-INCREASE-CURRENT>                                        5,695,420
<NET-CHANGE-FROM-OPS>                                           14,451,836
<EQUALIZATION>                                                           0
<DISTRIBUTIONS-OF-INCOME>                                      (10,168,932)
<DISTRIBUTIONS-OF-GAINS>                                                 0
<DISTRIBUTIONS-OTHER>                                                    0
<NUMBER-OF-SHARES-SOLD>                                          5,847,868
<NUMBER-OF-SHARES-REDEEMED>                                     (8,371,917)
<SHARES-REINVESTED>                                                703,467
<NET-CHANGE-IN-ASSETS>                                         (13,264,468)
<ACCUMULATED-NII-PRIOR>                                         (1,744,540)
<ACCUMULATED-GAINS-PRIOR>                                                0
<OVERDISTRIB-NII-PRIOR>                                                  0
<OVERDIST-NET-GAINS-PRIOR>                                               0
<GROSS-ADVISORY-FEES>                                            1,006,819
<INTEREST-EXPENSE>                                                       0
<GROSS-EXPENSE>                                                  1,013,819
<AVERAGE-NET-ASSETS>                                           198,435,845
<PER-SHARE-NAV-BEGIN>                                                 9.88
<PER-SHARE-NII>                                                       0.50
<PER-SHARE-GAIN-APPREC>                                               0.25
<PER-SHARE-DIVIDEND>                                                  0.00
<PER-SHARE-DISTRIBUTIONS>                                            (0.50)
<RETURNS-OF-CAPITAL>                                                  0.00
<PER-SHARE-NAV-END>                                                  10.13
<EXPENSE-RATIO>                                                       0.51