EXHIBIT 99.906CERT



     Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
     -----------------------------------------------------------------------


     In connection with the shareholder  report of American  Century  California
Tax-Free and  Municipal  Funds (the  "Registrant")  on Form N-CSR for the period
ending February 28, 2006 (the "Report"), we, the undersigned,  certify, pursuant
to Section 906 of the Sarbanes-Oxley Act of 2002, that:

          (1)  The Report fully complies with the  requirements of Section 15(d)
               of the Securities Exchange Act of 1934; and

          (2)  The information  contained in the Report fairly presents,  in all
               material  respects,   the  financial  condition  and  results  of
               operations of the Registrant.


Dated:  April 28, 2006


                                         By:  /s/ William M. Lyons
                                              ----------------------------------
                                              William M. Lyons
                                              President
                                              (chief executive officer)



                                         By:  /s/ Maryanne L. Roepke
                                              ----------------------------------
                                              Maryanne L. Roepke
                                              Sr. Vice President, Treasurer, and
                                              Chief Financial Officer
                                              (chief financial officer)