AMERICAN CENTURY MUNICIPAL TRUST, 497J, 1999-10-05

AMERICAN CENTURY MUNICIPAL TRUST
497J, 1999-10-05

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                          American Century Investments
                                4500 Main Street
                          Kansas City, Missouri 64111

October 5, 1999

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, DC 20549

RE:  American Century Municipal Trust
     1933 Act File No. 2-91229
     1940 Act File No. 811-4025

Ladies and Gentlemen:

    Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, the
undersigned hereby certifies that the form of prospectus and statement of
additional information that would have been filed under paragraph (b) or (c) of
Rule 497 with respect to the above-referenced issuer would not have differed
from that contained in Post-Effective Amendment No. 28, filed September 29,
1999, to the issuer's Registration Statement on Form N-1A.

    Any concerns regarding this filing should be directed to the undersigned at
(650) 967-9683.

Sincerely,

/s/Charles C. S. Park
Charles C. S. Park
Assistant General Counsel