UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-PX

ANNUAL REPORT OF PROXY VOTING RECORD OF
REGISTERED MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number 811-9537

MFS CALIFORNIA MUNICIPAL FUND*

(Exact name of registrant as specified in charter)

500 Boylston Street, Boston, Massachusetts 02116

(Address of principal executive offices) (Zip code)

Susan S. Newton
Massachusetts Financial Services Company
500 Boylston Street
Boston, Massachusetts 02116

(Name and address of agents for service)

Registrant's telephone number, including area code: (617) 954-5000

Date of fiscal year end: November 30

Date of reporting period: July 1, 2010 - June 30, 2011

* Prior to October 1, 2010, the MFS California Municipal Fund was known as the MFS California Insured Municipal Fund.

ITEM 1. PROXY VOTING RECORD.



******************************* FORM N-Px REPORT *******************************

ICA File Number: 811-09537
Reporting Period: 07/01/2010 - 06/30/2011 MFS California Municipal Fund

==================== MFS CALIFORNIA MUNICIPAL FUND =====================

There is no proxy voting activity for the fund, as the fund did not hold any votable positions during the reporting period.
========== END NPX REPORT


SIGNATURES

Pursuant to the requirements of the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Registrant: MFS CALIFORNIA MUNICIPAL FUND*

By (Signature and Title): MARIA F. DIORIODWYER*

Maria F. DiOrioDwyer, Principal Executive Officer

Date: August 12, 2011

*By (Signature and Title) /s/ Susan S. Newton
 ---------------------------------------------------
 Susan S. Newton, as attorney-in-fact


* Executed by Susan S. Newton on behalf of Maria F. DiOrioDwyer pursuant to a Power of Attorney dated October 26, 2010. (1)

(1) Incorporated by reference to MFS Series Trust XIII (File Nos. 2-74959 and 811-3327) Post-Effective Amendment No. 45 filed with the SEC via EDGAR on March 10, 2011.

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