EXHIBIT (17)

 ------------------------------------- ------------------------------------ ---------------------------------------
|     TO VOTE BY TELEPHONE            |       TO VOTE BY INTERNET          |        TO VOTE BY MAIL                |
| 1) Read the Proxy Statement and     | 1) Read the Proxy Statement and    |  1) Read the Proxy Statement          |
| have the proxy card below at hand.  | have the proxy card below at hand. |  2) Check the appropriate boxes on the|
| 2) Call toll-free 1-888-________    | 2) Log on to www.proxyweb.com      |  proxy card on the reverse side.      |
| 3) Follow the simple instructions.  | 3) Follow the simple instructions. |  3) Sign and date the proxy Card.     |
|                                     |                                    |  4) Return the proxy card in the      |
|                                     |                                    |  envelope provided.                   |
 ------------------------------------- ------------------------------------ ---------------------------------------


                        AMERICAN CENTURY MUNICIPAL TRUST

                  AMERICAN CENTURY ARIZONA MUNICIPAL BOND FUND

      PROXY FOR SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON JUNE 27, 2007

KNOW ALL PERSONS BY THESE PRESENTS that the undersigned shareholder of American
Century Arizona Municipal Bond Fund (the "Fund"), a series of American Century
Municipal Trust (the "Trust"), hereby appoints each of Charles A. Etherington,
David H. Reinmiller, Brian L. Brogan, Otis H. Cowan and Janet A. Nash,
collectively or individually, as his or her attorney-in-fact and proxy, with the
power of substitution of each, to vote and act with respect to all shares of the
Fund, which the undersigned is entitled to vote at the Special Meeting of
Shareholders (the "Meeting") to be held on June 27, 2007 at the principal
executive offices of the Trust at 4500 Main Street, Kansas City, Missouri 64111,
at 11:30 a.m. Central Time, and at any adjournment thereof.

The attorneys named will vote the shares represented by this proxy in accordance
with the choices made on this ballot. If no choice is indicated as to an item,
this proxy will be voted affirmatively on such matter. Discretionary authority
is hereby conferred as to all other matters as may properly come before the
Meeting or any adjournment thereof.

THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF TRUSTEES OF THE TRUST. THIS
PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER DIRECTED BY THE
UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED "FOR"
THE PROPOSAL.

 --------------------------------------   Please complete, sign and return
|                                      |  this card as soon as possible.
|                                      |
|                                      |
|                                      |
|                                      |  --------------------------------------
|                                      |  Signature(s) and Title(s),       Date
 --------------------------------------   if applicable




                                  ‹ FOLD HERE ›

After careful consideration, the Board of Trustees of the Trust unanimously
approved the proposal listed below and recommended that shareholders vote "for"
the proposal.

PLEASE MARK YOUR VOTE BELOW IN BLUE OR BLACK INK OR NUMBER 2 PENCIL. PLEASE DO
NOT USE FINE POINT PENS.


                                                    FOR      AGAINST    ABSTAIN
                                                   ----       ----       ----
                                                  |    |     |    |     |    |
                                                   ----       ----       ----
1.   To approve an agreement and plan of
     reorganization whereby effective
     August 31, 2007, or on such
     other date as American Century may
     decide, American Century Arizona
     Municipal Bond Fund, will be reorganized
     into the American Century Tax-Free
     Bond Fund. Both American Century Arizona
     Municipal Bond Fund and American Century
     Tax-Free Bond Fund are series companies
     of American Century Municipal Trust.

YOUR VOTE IS IMPORTANT. PLEASE COMPLETE, SIGN AND RETURN THIS CARD AS SOON AS
POSSIBLE.




 ------------------------------------- ------------------------------------ ---------------------------------------
|     TO VOTE BY TELEPHONE            |       TO VOTE BY INTERNET          |        TO VOTE BY MAIL                |
| 1) Read the Proxy Statement and     | 1) Read the Proxy Statement and    |  1) Read the Proxy Statement          |
| have the proxy card below at hand.  | have the proxy card below at hand. |  2) Check the appropriate boxes on the|
| 2) Call toll-free 1-888-________    | 2) Log on to www.proxyweb.com      |  proxy card on the reverse side.      |
| 3) Follow the simple instructions.  | 3) Follow the simple instructions. |  3) Sign and date the proxy Card.     |
|                                     |                                    |  4) Return the proxy card in the      |
|                                     |                                    |  envelope provided.                   |
 ------------------------------------- ------------------------------------ ---------------------------------------


                        AMERICAN CENTURY MUNICIPAL TRUST

                  AMERICAN CENTURY FLORIDA MUNICIPAL BOND FUND

      PROXY FOR SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON JUNE 27, 2007

KNOW ALL PERSONS BY THESE PRESENTS that the undersigned shareholder of American
Century Florida Municipal Bond Fund (the "Fund"), a series of American Century
Municipal Trust (the "Trust"), hereby appoints each of Charles A. Etherington,
David H. Reinmiller, Brian L. Brogan, Otis H. Cowan and Janet A. Nash,
collectively or individually, as his or her attorney-in-fact and proxy, with the
power of substitution of each, to vote and act with respect to all shares of the
Fund, which the undersigned is entitled to vote at the Special Meeting of
Shareholders (the "Meeting") to be held on June 27, 2007 at the principal
executive offices of the Trust at 4500 Main Street, Kansas City, Missouri 64111,
at 11:30 a.m. Central Time, and at any adjournment thereof.

The attorneys named will vote the shares represented by this proxy in accordance
with the choices made on this ballot. If no choice is indicated as to an item,
this proxy will be voted affirmatively on such matter. Discretionary authority
is hereby conferred as to all other matters as may properly come before the
Meeting or any adjournment thereof.

THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF TRUSTEES OF THE TRUST. THIS
PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER DIRECTED BY THE
UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED "FOR"
THE PROPOSAL.

 --------------------------------------   Please complete, sign and return
|                                      |  this card as soon as possible.
|                                      |
|                                      |
|                                      |
|                                      |  --------------------------------------
|                                      |  Signature(s) and Title(s),       Date
 --------------------------------------   if applicable




                                  ‹ FOLD HERE ›

After careful consideration, the Board of Trustees of the Trust unanimously
approved the proposal listed below and recommended that shareholders vote "for"
the proposal.

PLEASE MARK YOUR VOTE BELOW IN BLUE OR BLACK INK OR NUMBER 2 PENCIL. PLEASE DO
NOT USE FINE POINT PENS.


                                                    FOR      AGAINST    ABSTAIN
                                                   ----       ----       ----
                                                  |    |     |    |     |    |
                                                   ----       ----       ----
1.   To approve an agreement and plan of
     reorganization whereby effective
     August 31, 2007, or on such other
     date as American Century may decide,
     American Century Florida Municipal
     Bond Fund, will be reorganized into the
     American Century Tax-Free Bond Fund.
     Both American Century Florida Municipal
     Bond Fund and American Century Tax-Free
     Bond Fund are series companies of
     American Century Municipal Trust.

YOUR VOTE IS IMPORTANT. PLEASE COMPLETE, SIGN AND RETURN THIS CARD AS SOON AS
POSSIBLE.


 ------------------------------------- ------------------------------------ ---------------------------------------
|     TO VOTE BY TELEPHONE            |       TO VOTE BY INTERNET          |        TO VOTE BY MAIL                |
| 1) Read the Proxy Statement and     | 1) Read the Proxy Statement and    |  1) Read the Proxy Statement          |
| have the proxy card below at hand.  | have the proxy card below at hand. |  2) Check the appropriate boxes on the|
| 2) Call toll-free 1-888-________    | 2) Log on to www.proxyweb.com      |  proxy card on the reverse side.      |
| 3) Follow the simple instructions.  | 3) Follow the simple instructions. |  3) Sign and date the proxy Card.     |
|                                     |                                    |  4) Return the proxy card in the      |
|                                     |                                    |  envelope provided.                   |
 ------------------------------------- ------------------------------------ ---------------------------------------


                        AMERICAN CENTURY MUNICIPAL TRUST

                       AMERICAN CENTURY TAX-FREE BOND FUND

      PROXY FOR SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON JUNE 27, 2007

KNOW ALL PERSONS BY THESE PRESENTS that the undersigned shareholder of American
Century Tax-Free Bond Fund (the "Fund"), a series of American Century Municipal
Trust (the "Trust"), hereby appoints each of Charles A. Etherington, David H.
Reinmiller, Brian L. Brogan, Otis H. Cowan and Janet A. Nash, collectively or
individually, as his or her attorney-in-fact and proxy, with the power of
substitution of each, to vote and act with respect to all shares of the Fund,
which the undersigned is entitled to vote at the Special Meeting of Shareholders
(the "Meeting") to be held on June 27, 2007 at the principal executive offices
of the Trust at 4500 Main Street, Kansas City, Missouri 64111, at 11:30 a.m.
Central Time, and at any adjournment thereof.

The attorneys named will vote the shares represented by this proxy in accordance
with the choices made on this ballot. If no choice is indicated as to an item,
this proxy will be voted affirmatively on such matter. Discretionary authority
is hereby conferred as to all other matters as may properly come before the
Meeting or any adjournment thereof.

THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF TRUSTEES OF THE TRUST. THIS
PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER DIRECTED BY THE
UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED "FOR"
THE PROPOSAL.

 --------------------------------------   Please complete, sign and return
|                                      |  this card as soon as possible.
|                                      |
|                                      |
|                                      |
|                                      |  --------------------------------------
|                                      |  Signature(s) and Title(s),       Date
 --------------------------------------   if applicable




                                  ‹ FOLD HERE ›

After careful consideration, the Board of Trustees of the Trust unanimously
approved the proposal listed below and recommended that shareholders vote "for"
the proposal.

PLEASE MARK YOUR VOTE BELOW IN BLUE OR BLACK INK OR NUMBER 2 PENCIL. PLEASE DO
NOT USE FINE POINT PENS.


                                                    FOR      AGAINST    ABSTAIN
                                                   ----       ----       ----
                                                  |    |     |    |     |    |
                                                   ----       ----       ----
1.   To approve a reclassification of the
     Advisor Shares of American Century
     Tax-Free Bond, a series company of
     American Century Municipal Trust,
     whereby effective November 30,
     2007 or on such other date as
     American Century may decide, all
     of the Advisor Class shares will
     be reclassified as Investor Class
     shares of the American Century
     Tax-Free Bond Fund.

YOUR VOTE IS IMPORTANT. PLEASE COMPLETE, SIGN AND RETURN THIS CARD AS SOON AS
POSSIBLE.