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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-Q

                   CERTIFIED SHAREHOLDER REPORT 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) (ZIP code)


            Terrence J Cullen, Pioneer Investment Management, Inc.,
                       60 State Street, Boston, MA 02109
                    (Name and address of agent for service)


Registrant's telephone number, including area code:  (617) 742-7825


Date of fiscal year end:  April 30

Date of reporting period:  July 31, 2013

Form N-Q is to be used by management investment companies, other than small
business investment companies registered on Form N-5 (239.24 and 274.5 of this
chapter), to file reports with the Commission, not later than 60 days after
close of the first and third fiscal quarters, pursuant to Rule 30b1-5under
the Investment Company Act of 1940 (17 CFR 270.30b-5).  The Commission may
use the information provided on Form N-Q in its regulatory, disclosure review,
inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q,
and the Commission will make this information public. A registrant is not
required to respond to the collection of information contained in Form N-Q
unless the Form displays a currently valid Office of Management and Budget
("OMB") control number. Please direct comments concerning the accuracy of the
information collection burden estimate and any suggestions for reducing the
burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW,
Washington, DC 20549-0609.  The OMB has reviewed this collection of information
under the clearance requirements of 44 U.S.C. ss. 3507.


<PAGE>
ITEM 1. Schedule of Investments.


    

Pioneer Municipal

                     High Income Trust


 NQ | July 31, 2013

 
Ticker Symbol:  MHI
 
 
 
 


 
 

Schedule of Investments | 7/31/2013 (unaudited)


   
Principal
Amount
USD ($)
S&P/Moody's
Ratings  
(unaudited)            
 
Value
 
       
TAX EXEMPT OBLIGATIONS -   128.8% of Net Assets
 
       
Alabama - 2.1%
 
   
  2,500,000 
NR/B2
Alabama Industrial Development Authority Solid Waste Disposal Revenue, 6.45%, 12/1/23   
$ 2,502,675 
   
  4,500,000 
NR/NR
Huntsville-Redstone Village Special Care Facilities Financing Authority Nursing Home Revenue, 5.5%, 1/1/43   
  3,754,800 
         
$ 6,257,475 
       
Arizona - 0.2%
 
   
  24,000 
NR/Baa3
Pima County Industrial Development Authority Education Revenue, 6.75%, 7/1/31   
$ 23,619 
   
  500,000 
NR/Baa1
Yavapai County Industrial Development Authority Medical Revenue, 6.0%, 8/1/33   
  501,425 
         
$ 525,044 
       
California - 9.8%
 
   
  3,000,000(a)
NR/A1
Abag Finance Authority for Nonprofit Corp., Revenue, 5.75%, 7/1/37   
$ 3,359,460 
   
  1,450,000 
NR/NR
California Enterprise Development Authority Recovery Zone Facility Revenue, 8.5%, 4/1/31   
  1,577,585 
   
  5,000,000 
NR/Baa3
California Pollution Control Financing Authority, 5.0%, 7/1/37   
  4,656,800 
   
  1,400,000 
NR/NR
California Statewide Communities Development Authority, 5.625%, 11/1/33   
  1,249,990 
   
  568,006(b)
NR/NR
California Statewide Communities Development Authority Environmental Facilities Revenue, 9.0%, 12/1/38   
  4,936 
   
  4,000,000 
BB/NR
California Statewide Communities Development Authority Revenue Higher Education Revenue, 7.25%, 10/1/38 (144A) 
  3,906,400 
   
  15,000,000(c)
NR/NR
Inland Empire Tobacco Securitization Authority Revenue, 0.0%, 6/1/36   
  2,352,600 
   
  7,885,000 
AA-/WR
Lehman Municipal Trust Receipts Revenue, RIB, 11.073%, 9/20/28 (144A) 
  8,291,551 
   
  2,000,000 
B-/Caa1
Tobacco Securitization Authority of Northern California Revenue, 5.375%, 6/1/38   
  1,588,100 
   
  3,000,000 
BB+/B3
Tobacco Securitization Authority of Southern California Revenue, 5.0%, 6/1/37   
  2,343,450 
         
$ 29,330,872 
       
Colorado - 3.6%
 
   
  2,000,000 
BBB+/NR
Colorado Health Facilities Authority Revenue, 5.25%, 5/15/42   
$ 1,936,400 
   
  1,000,000 
NR/NR
Kremmling Memorial Hospital District Certificate of Participation, 7.125%, 12/1/45   
  1,031,280 
   
  7,500,000 
AA+/Aa2
Regional Transportation District Revenue, 5.0%, 11/1/31   
  7,985,100 
         
$ 10,952,780 
       
Connecticut - 6.0%
 
   
  1,000,000 
NR/NR
Hamden Connecticut Facility Revenue, 7.75%, 1/1/43   
$ 1,026,740 
   
  10,335,000(d)
AAA/WR
Lehman Municipal Trust Receipts Revenue, 11.809%, 8/21/35   
  11,948,190 
   
  5,000,000 
B/NR
Mohegan Tribe of Indians Gaming Authority, 6.25%, 1/1/31   
  5,000,450 
         
$ 17,975,380 
       
District of Colombia - 3.8%
 
   
  5,000,000 
BBB/Baa1
District of Columbia Tobacco Settlement Financing Corp., 6.5%, 5/15/33   
$ 5,316,750 
   
  6,000,000 
BBB/Baa1
District of Columbia Tobacco Settlement Financing Corp., 6.75%, 5/15/40   
  6,075,000 
         
$ 11,391,750 

   
Principal
Amount
USD ($)
S&P/Moody's
Ratings  
(unaudited)            
 
Value
 
       
Florida - 7.1%
 
   
  1,500,000 
NR/NR
Alachua County Health Facilities Authority Revenue, 8.125%, 11/15/41   
$ 1,623,135 
   
  1,500,000 
NR/NR
Alachua County Health Facilities Authority Revenue, 8.125%, 11/15/46   
  1,618,980 
   
  1,400,000 
NR/NR
Beacon Lakes Community Development District Special Assessment, 6.9%, 5/1/35   
  1,413,538 
   
  500,000 
NR/B1
Capital Trust Agency Revenue Bonds, 7.75%, 1/1/41   
  534,160 
   
  1,000,000 
NR/NR
Florida Development Finance Corp., Educational Facilities Revenue, 6.0%, 9/15/40   
  894,660 
   
  2,000,000 
NR/NR
Florida Development Finance Corp., Educational Facilities Revenue, 7.625%, 6/15/41   
  2,079,020 
   
  1,000,000 
NR/NR
Florida Development Finance Corp., Educational Facilities Revenue, 7.75%, 6/15/42   
  1,059,900 
   
  1,000,000(a)
NR/WR
Hillsborough County Industrial Development Authority Revenue, 8.0%, 8/15/32   
  1,350,490 
   
  2,260,000 
NR/NR
Liberty County Subordinate Revenue, 8.25%, 7/1/28   
  1,730,437 
   
  2,500,000 
A/A2
Miami-Dade County Florida Aviation Revenue, 5.5%, 10/1/41   
  2,594,975 
   
  1,000,000 (b) 
NR/NR
St. Johns County Industrial Development Authority Revenue, 5.25%, 1/1/26   
  480,000 
   
  2,000,000 (b) 
NR/NR
St. Johns County Industrial Development Authority Revenue, 5.375%, 1/1/40   
  960,000 
   
  5,000,000 
NR/Baa1
Tallahassee Health Facilities Revenue, 6.375%, 12/1/30   
  5,003,450 
         
$ 21,342,745 
       
Georgia - 3.2%
 
   
  4,240,000 
AA-/WR
Atlanta Georgia Water and Wastewater Revenue, RIB, 10.795%, 11/1/43 (144A) 
$ 4,241,908 
   
  500,000 
B/NR
Clayton County Development Authority Revenue, 9.0%, 6/1/35   
  539,665 
   
  2,400,000 
NR/NR
Fulton County Residential Care Facilities Revenue, 5.0%, 7/1/27   
  2,211,768 
   
  3,100,000 
NR/NR
Fulton County Residential Care Facilities Revenue, 5.125%, 7/1/42   
  2,606,139 
         
$ 9,599,480 
       
Idaho - 1.7%
 
   
  5,000,000 
A-/Baa1
Power County Industrial Development Corp., Revenue, 6.45%, 8/1/32   
$ 5,004,250 
           
       
Illinois - 15.0%
 
 
  1,827,000(c)
NR/NR
Illinois Finance Authority Revenue, 0.0%, 11/15/52   
$ 204,441 
   
  2,087,000(d)
NR/NR
Illinois Finance Authority Revenue, 4.0%, 11/15/52   
  1,191,406 
   
  3,865,000 
BBB+/NR
Illinois Finance Authority Revenue, 6.0%, 8/15/38   
  4,054,076 
   
  2,000,000 
AA+/Aa2
Illinois Finance Authority Revenue, 6.0%, 8/15/39   
  2,239,120 
   
  2,450,000 
NR/NR
Illinois Finance Authority Revenue, 6.375%, 5/15/17   
  2,451,984 
   
  2,500,000 
NR/Baa3
Illinois Finance Authority Revenue, 6.5%, 4/1/39   
  2,656,850 
   
  240,000 
NR/NR
Illinois Finance Authority Revenue, 7.0%, 11/15/17   
  235,630 
   
  500,000 
NR/NR
Illinois Finance Authority Revenue, 7.0%, 5/15/18   
  500,575 
 
  855,000 
NR/NR
Illinois Finance Authority Revenue, 7.0%, 11/15/27   
  798,170 
   
  1,700,000 
NR/NR
Illinois Finance Authority Revenue, 7.625%, 5/15/25   
  1,843,837 
   
  600,000 
NR/NR
Illinois Finance Authority Revenue, 7.75%, 5/15/30   
  645,486 

   
Principal
Amount
USD ($)
S&P/Moody's
Ratings  
(unaudited)            
 
Value
 
       
Illinois - (continued)
 
   
  2,000,000 
NR/NR
Illinois Finance Authority Revenue, 8.0%, 5/15/40   
  $2,149,800 
   
  3,200,000 
NR/NR
Illinois Finance Authority Revenue, 8.0%, 5/15/46   
  3,430,496 
   
  4,000,000 
NR/NR
Illinois Finance Authority Revenue, 8.25%, 5/15/45   
  4,006,360 
   
  2,500,000 
NR/NR
Illinois Finance Authority Revenue, 8.25%, 2/15/46   
  2,514,200 
   
  16,880,000 
AAA/Baa1
Metropolitan Pier & Exposition Authority Dedicated State Tax Revenue, 5.65%, 6/15/22   
  15,022,356 
   
  1,425,000 
NR/NR
Southwestern Illinois Development Authority Revenue, 5.625%, 11/1/26   
  1,128,386 
         
$ 45,073,173 
       
Indiana - 1.7%
 
   
  250,000 
NR/NR
City of Carmel Indiana Nursing Home Revenue, 7.0%, 11/15/32   
$ 256,305 
   
  750,000 
NR/NR
City of Carmel Indiana Nursing Home Revenue, 7.125%, 11/15/42   
  765,443 
   
  500,000 
NR/NR
City of Carmel Indiana Nursing Home Revenue, 7.125%, 11/15/47   
  506,865 
   
  3,570,000 
NR/NR
Vigo County Hospital Authority Revenue, 5.8%, 9/1/47 (144A) 
  3,516,521 
         
$ 5,045,134 
       
Louisiana - 3.0%
 
   
  2,260,000 
BBB-/Baa3
Jefferson Parish Hospital Service District No. 2, 6.375%, 7/1/41   
$ 2,376,526 
   
  1,500,000 
BBB-/Baa3
Louisiana Local Government Environmental Facilities & Community Development Authority Revenue, 6.75%, 11/1/32   
  1,574,955 
   
  5,000,000 
NR/Baa1
Louisiana Public Facilities Authority Revenue, 5.5%, 5/15/47   
  5,078,000 
         
$ 9,029,481 
       
Maine - 0.6%
 
   
  1,500,000 
NR/Baa3
Maine Health & Higher Educational Facilities Authority Revenue, 7.5%, 7/1/32   
$ 1,791,330 
           
       
Massachusetts - 5.2%
 
   
  2,195,000 
NR/NR
Massachusetts Development Finance Agency Revenue, 7.1%, 7/1/32   
$ 2,191,422 
   
  7,100,000 
A/WR
Massachusetts Development Finance Agency Revenue, RIB, 5.75%, 1/1/42   
  7,708,967 
   
  725,000 
AA/NR
Massachusetts Educational Financing Authority Revenue, 6.0%, 1/1/28   
  784,878 
   
  4,500,000(b)
NR/NR
Massachusetts Health & Educational Facilities Authority Revenue, 6.5%,
1/15/38   
  17,595 
   
  5,000,000 
B+/NR
Massachusetts Health & Educational Facilities Authority Revenue, 6.75%, 10/1/33   
  5,006,350 
         
$ 15,709,212 
       
Michigan - 3.3%
 
   
  935,000 
NR/NR
Doctor Charles Drew Academy Certificate of Participation, 5.7%, 11/1/36   
$ 619,849 
   
  2,000,000 
BB+/NR
Kent Hospital Finance Authority Revenue, 6.25%, 7/1/40   
  2,053,320 
   
  2,640,000 
AA/Aa1
Michigan State University Revenue, 5.0%, 8/15/41   
  2,702,753 
   
  5,830,000 
B-/NR
Michigan Tobacco Settlement Finance Authority Revenue, 6.0%, 6/1/48   
  4,594,506 
         
$ 9,970,428 
       
Minnesota - 0.4%
 
   
  1,000,000 
NR/NR
Port Authority of the City of Bloomington, Minnesota Recovery Zone Facility Revenue, 9.0%, 12/1/35   
$ 1,122,170 
           

   
Principal
Amount
USD ($)
S&P/Moody's
Ratings  
(unaudited)            
 
Value
 
       
Montana - 0.1%
 
   
  1,600,000(b)
NR/NR
Two Rivers Authority Inc., Project Revenue, 7.375%, 11/1/27   
$ 233,568 
           
       
New Jersey - 5.9%
 
   
  6,500,000 
NR/NR
New Jersey Economic Development Authority Revenue, 10.5%, 6/1/32 (144A) 
$ 6,415,305 
   
  3,000,000 
B/B2
New Jersey Economic Development Authority Revenue, 5.25%, 9/15/29   
  2,813,550 
   
  2,500,000 
B/B2
New Jersey Economic Development Authority Revenue, 5.75%, 9/15/27   
  2,430,775 
   
  6,150,000 (d) 
B/B2
New Jersey Economic Development Authority Revenue, 7.0%, 11/15/30   
  6,152,829 
         
$ 17,812,459 
       
New Mexico - 1.2%
 
   
  1,500,000 
NR/NR
Otero County New Mexico Project Revenue, 6.0%, 4/1/23   
$ 1,273,065 
   
  2,960,000 
NR/NR
Otero County New Mexico Project Revenue, 6.0%, 4/1/28   
  2,334,315 
         
$ 3,607,380 
       
New York - 8.2%
 
   
  2,000,000 
NR/NR
Chautauqua County Capital Resource Corp., Revenue, 8.0%, 11/15/30   
$ 2,075,900 
   
  3,000,000 
NR/NR
Dutchess County Industrial Development Agency Revenue, 7.5%, 3/1/29   
  3,042,540 
   
  2,000,000 
BBB+/NR
Hempstead Local Development Corp., Revenue, 5.75%, 7/1/39   
  2,048,160 
   
  2,000,000 
BB/B2
New York City Industrial Development Agency Revenue, 5.25%, 12/1/32   
  1,875,180 
   
  2,000,000 
BB/B2
New York City Industrial Development Agency Revenue, 7.625%, 12/1/32   
  2,014,360 
   
  7,040,000(d)
AAA/WR
New York State Dormitory Authority Revenue, 13.469%, 5/29/14 (144A) 
  9,644,307 
   
  1,000,000 
NR/Ba1
New York State Dormitory Authority Revenue, 6.125%, 12/1/29   
  1,055,130 
   
  3,000,000 
NR/NR
Suffolk County Industrial Development Agency Revenue, 7.25%, 1/1/30   
  2,968,590 
         
$ 24,724,167 
       
North Carolina - 3.7%
 
   
  4,795,000 
NR/NR
Charlotte North Carolina Special Facilities Revenue, 7.75%, 2/1/28   
$ 4,799,219 
   
  6,685,000 
NR/NR
Charlotte Special Facilities Revenue, 5.6%, 7/1/27   
  6,459,181 
         
$ 11,258,400 
       
North Dakota - 0.8%
 
   
  2,525,000 
BBB+/NR
County of Burleigh ND, 5.0%, 7/1/38   
$ 2,472,051 
           
       
Oklahoma - 0.4%
 
   
  1,225,000 
NR/WR
Tulsa Airports Improvement Trust Revenue, 6.25%, 6/1/20   
$ 1,225,000 
           
       
Pennsylvania - 4.6%
 
   
  1,550,000 
NR/Baa2
Allegheny County Hospital Development Authority Revenue, 5.125%, 5/1/25   
$ 1,549,891 
   
  1,280,000(b)
NR/WR
Langhorne Manor Borough Higher Education Authority Revenue, 7.35%, 7/1/22   
  344,064 
   
  5,000,000 
B-/Caa2
Pennsylvania Economic Development Financing Authority Solid Waste Disposal Revenue, 6.0%, 6/1/31   
  4,983,250 
   
  1,000,000 
BB-/NR
Philadelphia Authority for Industrial Development Revenue, 6.5%, 6/15/33 (144A) 
  994,390 
   
  1,000,000 
BB-/NR
Philadelphia Authority for Industrial Development Revenue, 6.75%, 6/15/43 (144A) 
  994,170 
   
  5,900,000 (e) 
BB+/Ba2
Philadelphia Hospitals & Higher Education Facilities Authority Revenue, 5.0%, 7/1/34   
  5,036,181 
         
$ 13,901,946 

   
Principal
Amount
USD ($)
S&P/Moody's
Ratings  
(unaudited)            
 
Value
 
       
Rhode Island - 2.1%
 
   
  5,950,000(e)
NR/NR
Central Falls Rhode Island Detention Facility Corp., Revenue, 7.25%, 7/15/35   
$ 4,638,560 
   
  1,500,000 
NR/NR
Rhode Island Health & Educational Building Corp., Revenue, 8.375%, 1/1/46   
  1,688,655 
         
$ 6,327,215 
       
South Carolina - 1.3%
 
 
  3,850,000(a)
BBB+/Baa1
South Carolina Jobs Economic Development Authority Revenue, 6.375%, 8/1/34   
$ 3,850,000 
         
$ 3,850,000 
       
Tennessee - 1.5%
 
   
  4,600,000 
BBB+/NR
Sullivan County Health, Educational & Housing Facilities Board Revenue, 5.25%, 9/1/36   
$ 4,557,266 
           
       
Texas - 17.8%
 
   
  2,500,000 
BB+/Baa3
Central Texas Regional Mobility Authority Revenue, 6.75%, 1/1/41   
$ 2,705,450 
   
  4,000,000 
NR/NR
Decatur Hospital Authority Medical Revenue, 7.0%, 9/1/25   
  4,141,760 
   
  725,078(b)
NR/NR
Gulf Coast Industrial Development Authority Revenue, 7.0%, 12/1/36   
  6,526 
   
  3,750,000 
B/B2
Houston Airport System Special Facilities Revenue, 5.7%, 7/15/29   
  3,587,213 
   
  3,000,000 
NR/NR
Jefferson County Industrial Development Corp., Revenue, 8.25%, 7/1/32   
  3,100,800 
   
  5,340,000 
NR/NR
Lubbock Health Facilities Development Corp., Nursing Home Revenue, 6.625%, 7/1/36   
  5,417,483 
   
  10,000,000 
BBB+/A3
North Texas Tollway Authority Transportation Revenue, 5.75%, 1/1/33   
  10,564,900 
   
  2,810,000(d)
AAA/Aaa
Northside Independent School District, General Obligation, 11.652%, 9/29/12 (144A) 
  3,019,738 
   
  1,500,000 
NR/NR
Red River Health Facilities Development Corp., Revenue, 8.0%, 11/15/41   
  1,610,430 
   
  4,000,000 
NR/NR
Sanger Industrial Development Corp., Revenue, 8.0%, 7/1/38   
  4,023,560 
   
  7,040,000(d)
AA+/Aaa
State of Texas, General Obligation, 12.646%, 4/1/30   
  8,077,626 
   
  2,000,000 
NR/NR
Tarrant County Cultural Education Facilities Finance Corp., Revenue, 8.0%, 11/15/34   
  2,147,700 
   
  1,000,000 
NR/NR
Tarrant County Cultural Education Facilities Finance Corp., Revenue, 8.125%,
11/15/39   
  1,059,400 
   
  1,500,000 
NR/NR
Tarrant County Cultural Education Facilities Finance Corp., Revenue, 8.25%,
11/15/44   
  1,591,485 
   
  2,500,000 
NR/NR
Travis County Health Facilities Development Corp., Revenue, 7.125%, 1/1/46   
  2,455,600 
         
$ 53,509,671 
       
Vermont - 0.5%
 
   
  1,500,000(a)
A-/Baa1
Vermont Educational & Health Buildings Financing Agency Higher Education Revenue, 6.0%, 10/1/28   
$ 1,514,325 
           
       
Virginia - 0.3%
 
   
  1,000,000 
BBB/Ba1
Peninsula Ports Authority Revenue, 6.0%, 4/1/33   
$ 1,006,840 
           
       
Washington - 10.8%
 
   
  4,710,000(a)
A+/A2
Spokane Public Facilities District Hotel/Motel Tax & Sales, 5.75%, 12/1/27   
$ 4,797,371 
   
  14,315,000(c)
AA+/Aa1
State of Washington, General Obligation, 0.0%, 6/1/22   
  10,945,535 
   
  7,025,000 
BBB/Baa1
Tobacco Settlement Authority Revenue, 6.625%, 6/1/32   
  7,110,494 
   
  3,795,000 
A/A2
Washington State Health Care Facilities Authority Revenue, 6.0%, 1/1/33   
  3,957,540 
   
  1,150,000 
NR/NR
Washington State Housing Finance Commission Revenue, 6.75%, 10/1/47   
  1,011,954 

   
Principal
Amount
USD ($)
S&P/Moody's
Ratings  
(unaudited)            
 
Value
 
       
Washington - (continued)
 
   
  5,000,000 
NR/NR
Washington State Housing Finance Committee Nonprofit Revenue, 5.625%, 1/1/27   
  $   4,633,050 
         
$ 32,455,944 
       
West Virginia - 0.9%
 
   
  2,000,000 
NR/NR
City of Philippi WV, 7.75%, 10/1/44   
$ 1,901,020 
   
  745,000 
NR/NR
West Virginia Hospital Finance Authority Hospital Revenue, 9.125%, 10/1/41   
  902,389 
         
$ 2,803,409 
       
Wisconsin - 2.0%
 
   
  2,320,000(f) (g)
NR/NR
Aztalan Township, 7.5%, 5/1/18   
$ – 
   
  2,500,000 
NR/NR
Wisconsin Public Finance Authority Continuing Care Retirement Community Revenue, 8.25%, 6/1/46   
  2,780,325 
   
  1,500,000 
NR/NR
Wisconsin State Public Finance Authority Revenue, 8.375%, 6/1/20   
  1,504,350 
   
  1,500,000 
NR/NR
Wisconsin State Public Finance Authority Revenue, 8.625%, 6/1/47   
  1,567,950 
         
$ 5,852,625 
       
TOTAL TAX EXEMPT OBLIGATIONS
 
       
(Cost $372,192,065)
$ 387,232,970 
           
       
MUNICIPAL COLLATERALIZED DEBT OBLIGATION -   1.8% of Net Assets
 
   
  10,000,000(d)(e)
NR/NR
Non-Profit Preferred Funding Trust I, 6.75%, 9/15/37 (144A) 
$ 5,553,400 
           
       
TOTAL MUNICIPAL COLLATERALIZED DEBT OBLIGATION
 
       
(Cost  $10,000,000)
$ 5,553,400 
           
           
       
TOTAL INVESTMENTS IN SECURITIES - 130.6%
 
       
(Cost - $382,192,065) (h) (i)
$ 392,786,370 
       
OTHER ASSETS AND LIABILITIES -3.0%
$ 8,914,893 
       
PREFERRED SHARES AT REDEMPTION VALUE,
INCLUDING DIVIDENDS PAYABLE - (33.6)%
$ (101,000,151)
       
NET ASSETS APPLICABLE TO
COMMON SHAREOWNERS - 100.0%
$ 300,701,112 
 
 
 
NR
 
Security not rated by S&P or Moody's.
WR
 
Rating withdrawn by either S&P or Moody's.
(144A)
 
Security is exempt from registration under Rule 144A of the Securities Act of 1933.  Such securities may be resold normally to qualified institutional buyers in a transaction exempt from registration. At July 31, 2013, the value of these securities amounted to $46,577,690, or 15.5% of total net assets applicable to common shareowners.
RIB
 
Residual Interest Bond.  The interest rate is subject to change periodically and inversely based upon prevailing market rates.  The interest rate shown is the rate at July 31, 2013
 
 
 
(a)
Prerefunded bonds have been collateralized by U.S. Treasury or U.S. Government Agency securities which are held in escrow to pay interest and principal on the tax exempt issue and to retire the bonds in full at the earliest refunding date.
(b)
Security is in default and is non income producing.
(c)
Security issued with a zero coupon.  Income is recognized through accretion of discount.
(d)
The interest rate is subject to change periodically. The interest is shown is the rate at July 31, 2013.
(e)
Indicates a security that has been deemed as illiquid.  As of July 31, 2013 the aggregate cost of illiquid securities in the Trust's portfolio was $21,832,292.  As of that date, the aggregate value of illiquid securities in the Trust's portfolio of $15,228,141 represented 5.1% of total net assets applicable to common shareowners.
(f)
Security is valued using fair value methods (other than prices supplied by independent pricing services).
(g)
The company is scheduled for approval of a reorganization plan.
 
 
 



(h)
The concentration of investments by type of obligation/ market sector is as follows :
 
 
   Insured
 
NATL-RE
5.0
%
 
FSA
3.2
 
 
NATL-RE FGIC
2.8
 
 
AMBAC GO OF INSTN
2.0
 
 
PSF-GTD
0.8
 
 
   Revenue Bonds:
 
Health Revenue
18.8
 
 
Facilities Revenue
14.9
 
 
Other Revenue
13.6
 
 
Development Revenue
11.8
 
 
Tobacco Revenue
7.5
 
 
Education Revenue
7.0
 
 
Airport Revenue
4.8
 
 
Transportation Revenue
4.7
 
 
Pollution Control Revenue
1.9
 
 
Water Revenue
1.2
 
 
Utilities Revenue
0.0
*
   
100.0
%
 

*      Amount is less than 0.1%

(i)
 At July 31, 2013, the net unrealized gain on investments based on cost for federal tax purposes of $382,047,137 was as follows:
 
   
 
Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost
$ 30,465,581
 
Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value
  (19,726,348)
   
 
Net unrealized appreciation
$ 10,739,733 
     
For financial reporting purposes net unrealized gain on investments was
$ 10,594,305 and cost of investments aggregated  $382,192,065.
 
 

 
 




Various inputs are used in determining the value of the Trust's investments. These inputs are summarized in the three broad levels below.
 
   
Level 1 - quoted prices in active markets for identical securities
 
Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds
 
credit risks, etc.)
 
Level 3 - significant unobservable inputs (including the Trust's own assumptions in determining fair value of investments)
 
   
Generally, equity securities are categorized as Level 1, fixed income securities and senior loans are categorized as Level 2, and securities valued using fair value methods (other than prices supplied by independent pricing services) as level 3.
 
   
The following is a summary of the inputs used as of July 31, 2013, in valuing the Trust's investments.
 
   
                         
   
Level 1
   
Level 2
   
Level 3
   
Total
 
   
                         
                         
                         
Tax Exempt Obligations
  $       387,232,970     $ **      387,232,970  
                                 
                                 
Municipal Collateralized Debt Obligation
          5,553,400             5,553,400  
Total Investments in Securities
  $     $ 392,786,370     $     $ 392,786,370  
   
 
 

The following is a reconciliation of assets valued using significant unobservable inputs (level 3):
 
   
Balance
as of
4/30/13
   
Realized
gain
(loss)
   
Change in
Unrealized appreciation
(depreciation)
   
Purchases
   
Sales
   
Accrued
discounts/ premiums
   
Transfers 
in to 
Level 3*
   
Transfers 
out of
Level 3*
   
Balance
as of
7/31/13
 
   
                                                       
                                                       
Total
  $     $     $     $     $     $     $     $     $ **
       
*  Transfers are calculated on the end of period value
 
**Includes security that is fair valued at $0.
 
At July 31, 2013, there were no transfers between 1, 2 and 3.
 


ITEM 2. CONTROLS AND PROCEDURES. (a) Disclose the conclusions of the registrant's principal executive officer or officers and principal financial officer or officers, or persons performing similar functions, about the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Act (17 CFR 270.30a-3(c))) as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph, based on their evaluation of these controls and procedures required by Rule 30a-3(b) under the Act (17 CFR270.30a-3(b))) and Rule 13a-15(b) or 15d-15(b) under the Exchange Act (17 CFR240.13a-15(b) or 240.15d-15(b)). The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose any change in the registrant's internal controls over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR270.30a-3(d)) that occurred during the registrant's last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. ITEM 3. EXHIBITS. (a) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2 under the Act (17 CFR 270.30a-2). Filed herewith. <PAGE> SIGNATURES [See General Instruction F] Pursuant to the requirements of the Securities Exchange Act of 1934 and 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, President Date September 27, 2013 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr., President Date September 27, 2013 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer Date September 27, 2013 * Print the name and title of each signing officer under his or her signature.
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