- Annual report of proxy voting record for management investment companies (N-PX)

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 811-21321

Pioneer Municipal High Income Trust
(Exact name of registrant as specified in charter)

60 State Street Boston, MA 02109
(Address of principal executive offices)

Dorothy Bourassa
60 State Street
Boston, MA 02109
(Name and address of agent for service)

Registrant's telephone number, including area code: [phone]

Date of fiscal year end: April 30

Date of reporting period: July 1, 2008 to June 30, 2009

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) Pioneer Municipal High Income Trust

By (Signature and Title) /s/ John F. Cogan, Jr. ------------------------- John F. Cogan, Jr., Chairman and President

Date August 19, 2009

===================== PIONEER MUNICIPAL HIGH INCOME TRUST ======================

DELTA AIR LINES, INC.

Ticker: DAL Security ID: 247361702 Meeting Date: JUN 22, 2009 Meeting Type: Annual Record Date: APR 24, 2009 # Proposal Mgt Rec Vote Cast Sponsor 1 Elect Director Richard H. Anderson For For Management 2 Elect Director Roy J. Bostock For For Management 3 Elect Director John S. Brinzo For For Management 4 Elect Director Daniel A. Carp For For Management 5 Elect Director John M. Engler For For Management 6 Elect Director Mickey P. Foret For For Management 7 Elect Director David R. Goode For For Management 8 Elect Director Paula Rosput Reynolds For For Management 9 Elect Director Kenneth C. Rogers For For Management 10 Elect Director Rodney E. Slater For For Management 11 Elect Director Douglas M. Steenland For For Management 12 Elect Director Kenneth B. Woodrow For For Management 13 Ratify Auditors For For Management 14 Provide for Cumulative Voting Against For Shareholder

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NORTHWEST AIRLINES CORP.

Ticker: NWA Security ID: 667280408 Meeting Date: SEP 25, 2008 Meeting Type: Annual Record Date: JUL 31, 2008 # Proposal Mgt Rec Vote Cast Sponsor 1.1 Elect Director Roy J. Bostock For For Management 1.2 Elect Director David A. Brandon For For Management 1.3 Elect Director Michael J. Durham For For Management 1.4 Elect Director John M. Engler For For Management 1.5 Elect Director Mickey P. Foret For For Management 1.6 Elect Director Robert L. Friedman For For Management 1.7 Elect Director Doris Kearns Goodwin For For Management 1.8 Elect Director Jeffrey G. Katz For For Management 1.9 Elect Director James J. Postl For For Management 1.10 Elect Director Rodney E. Slater For For Management 1.11 Elect Director Douglas M. Steenland For For Management 1.12 Elect Director William S. Zoller For For Management 2 Approve Reorganization For For Management 3 Ratify Auditors For For Management 4 Amend Omnibus Stock Plan For For Management 5 Adjourn Meeting For For Management

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