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

                                   FORM N-Q

                   QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS
    OF REGISTERED MANAGEMENT INVESTMENT COMPANY



  Investment Company Act file number 811-21321


                         Pioneer 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:  January 31, 2014

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 30b1-5 under
the Investment Company Act of 1940 (17 CFR 270.30b1-5).  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.

File the schedules as of the close of the reporting period as set forth in
ss. 210.12-12  12-14 of Regulation S-X [17 CFR 210.12-12  12-14]. The
schedules need not be audited.





        Pioneer Municipal
                          High Income Trust
      NQ| January 31, 2014

 
  Ticker Symbol:  MHI
 
 
 
 




   
Principal
Amount
USD ($)
S&P/Moody's
Ratings             
 
Value
 
       
TAX EXEMPT OBLIGATIONS -  131.5% of Net Assets
 
       
Alabama - 1.3%
 
   
  4,500,000 
NR/NR
Huntsville-Redstone Village Special Care Facilities Financing Authority Nursing Home Revenue, 5.5%, 1/1/43   
$ 3,715,065 
           
       
Arizona - 0.0%
 
   
  24,000 
NR/Baa3
Pima County Industrial Development Authority Education Revenue, 6.75%, 7/1/31   
$ 24,003 
           
       
California - 10.6%
 
   
  3,000,000(a)
NR/A1
Abag Finance Authority for Nonprofit Corp., Revenue, 5.75%, 7/1/37   
$ 3,293,880 
   
  1,450,000 
NR/NR
California Enterprise Development Authority Recovery Zone Facility Revenue, 8.5%, 4/1/31   
  1,569,872 
   
  5,000,000 
NR/Baa3
California Pollution Control Financing Authority, 5.0%, 7/1/37   
  4,812,900 
   
  1,740,000 
BB+/NR
California School Finance Authority, 7.375%, 10/1/43   
  1,803,040 
   
  1,400,000 
NR/NR
California Statewide Communities Development Authority, 5.625%, 11/1/33   
  1,277,710 
   
  568,006(b)(c)
NR/NR
California Statewide Communities Development Authority Environmental Facilities Revenue, 9.0%, 12/1/38   
  4,930 
   
  4,000,000 
B+/NR
California Statewide Communities Development Authority Revenue Higher Education Revenue, 7.25%, 10/1/38 (144A) 
  2,984,000 
   
  15,000,000(d)
NR/NR
Inland Empire Tobacco Securitization Authority Revenue, 0.0%, 6/1/36   
  2,430,750 
   
  7,885,000(e)
AA-/WR
Lehman Municipal Trust Receipts Revenue, RIB, 0.0%, 9/20/28 (144A) 
  9,315,812 
   
  2,000,000 
B-/Caa1
Tobacco Securitization Authority of Northern California Revenue, 5.375%, 6/1/38   
  1,509,600 
   
  3,000,000 
BB+/B3
Tobacco Securitization Authority of Southern California Revenue, 5.0%, 6/1/37   
  2,265,030 
         
$ 31,267,524 
       
Colorado - 1.5%
 
   
  1,500,000 
B+/NR
Colorado Educational & Cultural Facilities Authority, 8.0%, 9/1/43   
$ 1,486,410 
   
  2,000,000 
BBB+/NR
Colorado Health Facilities Authority Revenue, 5.25%, 5/15/42   
  2,008,820 
   
  1,000,000 
NR/NR
Kremmling Memorial Hospital District Certificate of Participation, 7.125%, 12/1/45   
  905,810 
         
$ 4,401,040 
       
Connecticut - 6.2%
 
   
  1,000,000 
NR/NR
Hamden Connecticut Facility Revenue, 7.75%, 1/1/43   
$ 1,018,340 
   
  10,335,000(e)
AAA/WR
Lehman Municipal Trust Receipts Revenue, 0.0%, 8/21/35   
  12,136,700 
   
  5,000,000 
B/NR
Mohegan Tribe of Indians Gaming Authority, 6.25%, 1/1/31   
  4,999,600 
         
$ 18,154,640 
       
District of Colombia - 3.8%
 
   
  5,000,000 
BBB/Baa1
District of Columbia Tobacco Settlement Financing Corp., 6.5%, 5/15/33   
$ 5,268,150 
   
  6,000,000 
BBB/Baa1
District of Columbia Tobacco Settlement Financing Corp., 6.75%, 5/15/40   
  5,969,520 
         
$ 11,237,670 
       
Florida - 5.4%
 
   
  1,500,000 
NR/NR
Alachua County Health Facilities Authority Revenue, 8.125%, 11/15/41   
$ 1,642,110 
   
  1,500,000 
NR/NR
Alachua County Health Facilities Authority Revenue, 8.125%, 11/15/46   
  1,638,090 

   
Principal
Amount
USD ($)
S&P/Moody's
Ratings              
 
Value
 
       
Florida - (continued)
 
   
  500,000 
NR/B1
Capital Trust Agency Revenue Bonds, 7.75%, 1/1/41   
$ 533,760 
   
  1,000,000(a)
NR/WR
Hillsborough County Industrial Development Authority Revenue, 8.0%, 8/15/32   
  1,349,820 
   
  2,260,000(b)
NR/NR
Liberty County Subordinate Revenue, 8.25%, 7/1/28   
  1,690,186 
   
  2,500,000 
A/A2
Miami-Dade County Florida Aviation Revenue, 5.5%, 10/1/41   
  2,633,875 
   
  1,000,000(b)(c)
NR/NR
St. Johns County Industrial Development Authority Revenue, 5.25%, 1/1/26   
  434,900 
   
  2,000,000(b)(c)
NR/NR
St. Johns County Industrial Development Authority Revenue, 5.375%, 1/1/40   
  869,800 
   
  5,000,000 
NR/Baa1
Tallahassee Health Facilities Revenue, 6.375%, 12/1/30   
  5,021,250 
         
$ 15,813,791 
       
Georgia - 4.5%
 
   
  4,240,000(e)
AA-/WR
Atlanta Georgia Water and Wastewater Revenue, RIB, 12.827%, 11/1/43 (144A) 
$ 4,280,577 
   
  2,500,000 
B+/NR
Clayton County Development Authority Revenue, 8.75%, 6/1/29   
  2,951,250 
   
  3,500,000 
B+/NR
Clayton County Development Authority Revenue, 9.0%, 6/1/35   
  3,703,595 
   
  3,000,000 
NR/NR
Fulton County Residential Care Facilities Revenue, 5.125%, 7/1/42   
  2,427,960 
         
$ 13,363,382 
       
Idaho - 1.7%
 
   
  5,000,000 
A-/Baa1
Power County Industrial Development Corp., Revenue, 6.45%, 8/1/32   
$ 5,005,050 
           
       
Illinois - 15.6%
 
   
  1,827,000(d)
NR/NR
Illinois Finance Authority Revenue, 0.0%, 11/15/52   
$ 186,949 
   
  2,087,000(e)
NR/NR
Illinois Finance Authority Revenue, 4.0%, 11/15/52   
  1,055,521 
   
  3,865,000 
BBB+/NR
Illinois Finance Authority Revenue, 6.0%, 8/15/38   
  4,045,805 
   
  2,000,000 
AA+/Aa2
Illinois Finance Authority Revenue, 6.0%, 8/15/39   
  2,253,800 
   
  1,895,000 
NR/NR
Illinois Finance Authority Revenue, 6.375%, 5/15/17   
  1,896,744 
   
  2,500,000 
NR/Baa3
Illinois Finance Authority Revenue, 6.5%, 4/1/39   
  2,553,025 
   
  240,000 
NR/NR
Illinois Finance Authority Revenue, 7.0%, 11/15/17   
  232,200 
   
  500,000 
NR/NR
Illinois Finance Authority Revenue, 7.0%, 5/15/18   
  500,580 
   
  820,000 
NR/NR
Illinois Finance Authority Revenue, 7.0%, 11/15/27   
  741,501 
   
  1,700,000 
NR/NR
Illinois Finance Authority Revenue, 7.625%, 5/15/25   
  1,788,927 
   
  600,000 
NR/NR
Illinois Finance Authority Revenue, 7.75%, 5/15/30   
  624,492 
   
  2,000,000 
NR/NR
Illinois Finance Authority Revenue, 8.0%, 5/15/40   
  2,079,440 
   
  3,200,000 
NR/NR
Illinois Finance Authority Revenue, 8.0%, 5/15/46   
  3,318,816 
   
  2,000,000 
NR/NR
Illinois Finance Authority Revenue, 8.125%, 2/15/40   
 1,994,520 
   
  4,000,000 
NR/NR
Illinois Finance Authority Revenue, 8.25%, 5/15/45   
  3,338,560 
   
  2,500,000 
NR/NR
Illinois Finance Authority Revenue, 8.25%, 2/15/46   
  2,503,725 
   
  16,880,000 
AAA/Baa1
Metropolitan Pier & Exposition Authority Dedicated State Tax Revenue, 0.0%, 6/15/22   
  15,723,382 
   
  1,350,000 
NR/NR
Southwestern Illinois Development Authority Revenue, 5.625%, 11/1/26   
  1,057,536 
         
$ 45,895,523 

   
Principal
Amount
USD ($)
S&P/Moody's
Ratings             
 
Value
 
       
Indiana - 1.6%
 
   
  250,000 
NR/NR
City of Carmel Indiana Nursing Home Revenue, 7.0%, 11/15/32   
$ 249,963 
   
  750,000 
NR/NR
City of Carmel Indiana Nursing Home Revenue, 7.125%, 11/15/42   
  745,800 
   
  500,000 
NR/NR
City of Carmel Indiana Nursing Home Revenue, 7.125%, 11/15/47   
  493,945 
   
  3,570,000 
NR/NR
Vigo County Hospital Authority Revenue, 5.8%, 9/1/47 (144A) 
  3,292,825 
         
$ 4,782,533 
       
Kentucky - 1.8%
 
   
  5,000,000 
NR/Baa2
Kentucky Economic Development Finance Authority Revenue, 6.375%, 6/1/40   
$ 5,300,950 
           
       
Louisiana - 3.1%
 
   
  2,260,000 
BB+/Baa3
Jefferson Parish Hospital Service District No. 2, 6.375%, 7/1/41   
$ 2,370,559 
   
  1,500,000 
BBB/Baa3
Louisiana Local Government Environmental Facilities & Community Development Authority Revenue, 6.75%, 11/1/32   
  1,600,215 
   
  5,000,000 
NR/Baa1
Louisiana Public Facilities Authority Revenue, 5.5%, 5/15/47   
  5,055,900 
         
$ 9,026,674 
       
Maine - 1.8%
 
   
  1,500,000 
NR/Ba1
Maine Health & Higher Educational Facilities Authority Revenue, 7.5%, 7/1/32   
$ 1,662,315 
   
  3,500,000 
AA-/Aa3
Maine Turnpike Authority Revenue, 5.0%, 7/1/42   
  3,711,960 
         
$ 5,374,275 
       
Maryland - 0.8%
 
   
  2,500,000 
NR/NR
Maryland Health & Higher Educational Facilities Authority Revenue, 6.75%, 7/1/44
$ 2,514,500 
           
       
Massachusetts - 5.4%
 
   
  2,195,000 
NR/NR
Massachusetts Development Finance Agency Revenue, 7.1%, 7/1/32   
$ 2,193,705 
   
  7,100,000 
A/WR
Massachusetts Development Finance Agency Revenue, RIB, 5.75%, 1/1/42   
  8,112,176 
   
  680,000 
AA/NR
Massachusetts Educational Financing Authority Revenue, 6.0%, 1/1/28   
  728,198 
   
  4,500,000(b)(c)
NR/NR
Massachusetts Health & Educational Facilities Authority Revenue, 6.5%, 1/15/38
  11,745 
   
  5,000,000 
B+/NR
Massachusetts Health & Educational Facilities Authority Revenue, 6.75%, 10/1/33   
  5,002,600 
         
$ 16,048,424 
       
Michigan - 3.4%
 
   
  895,000 
NR/NR
Doctor Charles Drew Academy Certificate of Participation, 5.7%, 11/1/36   
$ 650,736 
   
  2,000,000 
BB+/NR
Kent Hospital Finance Authority Revenue, 6.25%, 7/1/40   
  2,045,220 
   
  2,640,000 
AA/Aa1
Michigan State University Revenue, 5.0%, 8/15/41   
  2,793,912 
   
  5,830,000 
B-/NR
Michigan Tobacco Settlement Finance Authority Revenue, 6.0%, 6/1/48   
  4,492,132 
         
$ 9,982,000 
       
Minnesota - 1.3%
 
   
  3,500,000 
NR/NR
Port Authority of the City of Bloomington, Minnesota Recovery Zone Facility Revenue, 9.0%, 12/1/35   
$ 3,834,950 
           
       
Montana - 0.0%
 
   
  1,600,000(b)(c)
NR/NR
Two Rivers Authority Inc., Project Revenue, 7.375%, 11/1/27   
$ 127,664 
           
       
New Jersey - 6.1%
 
   
  6,500,000 
NR/NR
New Jersey Economic Development Authority Revenue, 10.5%, 6/1/32 (144A) 
$ 6,408,350 

   
Principal
Amount
USD ($)
S&P/Moody's
Ratings              
 
Value
 
       
New Jersey - (continued)
 
   
  3,000,000 
B/B2
New Jersey Economic Development Authority Revenue, 5.25%, 9/15/29   
$ 2,887,500 
   
  2,500,000 
B/B2
New Jersey Economic Development Authority Revenue, 5.75%, 9/15/27   
  2,439,925 
   
  6,150,000(e)
B/B2
New Jersey Economic Development Authority Revenue, 7.0%, 11/15/30   
  6,150,000 
         
$ 17,885,775 
       
New Mexico - 1.2%
 
   
  1,500,000 
NR/NR
Otero County New Mexico Project Revenue, 6.0%, 4/1/23   
$ 1,240,485 
   
  2,960,000 
NR/NR
Otero County New Mexico Project Revenue, 6.0%, 4/1/28   
  2,249,600 
         
$ 3,490,085 
       
New York - 8.1%
 
   
  2,000,000 
NR/NR
Chautauqua County Capital Resource Corp., Revenue, 8.0%, 11/15/30   
$ 2,048,540 
   
  3,000,000 
NR/NR
Dutchess County Industrial Development Agency Revenue, 7.5%, 3/1/29   
  2,361,540 
   
  2,000,000 
BBB+/NR
Hempstead Local Development Corp., Revenue, 5.75%, 7/1/39   
  2,086,680 
   
  2,000,000 
BB/B2
New York City Industrial Development Agency Revenue, 5.25%, 12/1/32   
  1,851,060 
   
  2,000,000 
BB/B2
New York City Industrial Development Agency Revenue, 7.625%, 12/1/32   
  2,009,660 
   
  7,040,000(e)
AAA/WR
New York State Dormitory Authority Revenue, 0.0%, 5/29/14 (144A) 
  9,425,997 
   
  1,000,000 
NR/Ba1
New York State Dormitory Authority Revenue, 6.125%, 12/1/29   
  1,000,100 
   
  3,000,000 
NR/NR
Suffolk County Industrial Development Agency Revenue, 7.25%, 1/1/30   
  2,999,610 
         
$ 23,783,187 
       
North Carolina - 3.9%
 
   
  4,795,000 
NR/NR
Charlotte North Carolina Special Facilities Revenue, 7.75%, 2/1/28   
$ 4,799,412 
   
  6,685,000 
NR/NR
Charlotte Special Facilities Revenue, 5.6%, 7/1/27   
  6,591,744 
         
$ 11,391,156 
       
North Dakota - 0.9%
 
   
  2,525,000 
BBB+/NR
County of Burleigh ND, 5.0%, 7/1/38   
$ 2,566,511 
           
       
Oregon - 1.9%
 
   
  5,190,000 
A+/A1
Oregon Health & Science University Revenue, 5.0%, 7/1/32   
$ 5,538,508 
           
       
Pennsylvania - 6.7%
 
   
  1,550,000 
NR/Baa2
Allegheny County Hospital Development Authority Revenue, 5.125%, 5/1/25   
$ 1,550,310 
   
  1,280,000(b)
NR/WR
Langhorne Manor Borough Higher Education Authority Revenue, 7.35%, 7/1/22   
  383,872 
   
  5,000,000 
CCC+/Caa2
Pennsylvania Economic Development Financing Authority Solid Waste Disposal Revenue, 6.0%, 6/1/31   
  4,999,600 
   
  1,000,000 
BB-/NR
Philadelphia Authority for Industrial Development Revenue, 6.5%, 6/15/33 (144A) 
  999,900 
   
  3,000,000 
BB-/NR
Philadelphia Authority for Industrial Development Revenue, 6.75%, 6/15/43 (144A) 
  2,993,970 
   
  4,000,000 
NR/NR
Philadelphia Authority for Industrial Development Revenue, 8.2%, 12/1/43   
  4,060,040 
   
  5,900,000 
BB+/Ba2
Philadelphia Hospitals & Higher Education Facilities Authority Revenue, 5.0%, 7/1/34   
  4,803,780 
         
$ 19,791,472 
       
Rhode Island - 2.1%
 
   
  5,900,000(c)
NR/NR
Central Falls Rhode Island Detention Facility Corp., Revenue, 7.25%, 7/15/35   
$ 4,443,113 
   
  1,500,000 
NR/NR
Rhode Island Health & Educational Building Corp., Revenue, 8.375%, 1/1/46   
  1,658,070 
         
$ 6,101,183 

   
Principal
Amount
USD ($)
S&P/Moody's
Ratings             
 
Value
 
       
Tennessee - 1.6%
 
   
  4,600,000 
BBB+/NR
Sullivan County Health, Educational & Housing Facilities Board Revenue, 5.25%, 9/1/36   
$ 4,601,978 
           
       
Texas - 18.0%
 
   
  2,500,000 
BB+/Baa3
Central Texas Regional Mobility Authority Revenue, 6.75%, 1/1/41   
$ 2,649,625 
   
  4,000,000 
NR/NR
Decatur Hospital Authority Medical Revenue, 7.0%, 9/1/25   
  4,089,800 
   
  725,078(b)(c)
NR/NR
Gulf Coast Industrial Development Authority Revenue, 7.0%, 12/1/36   
  6,518 
   
  3,750,000 
B/B2
Houston Airport System Special Facilities Revenue, 5.7%, 7/15/29   
  3,655,988 
   
  3,000,000(c)(f)
NR/NR
Jefferson County Industrial Development Corp., Revenue, 8.25%, 7/1/32   
  2,955,000 
   
  5,340,000 
NR/NR
Lubbock Health Facilities Development Corp., Nursing Home Revenue, 6.625%, 7/1/36   
  5,413,478 
   
  10,000,000 
BBB+/A3
North Texas Tollway Authority Transportation Revenue, 5.75%, 1/1/33   
  10,654,400 
   
  2,810,000(e)
AAA/Aaa
Northside Independent School District, General Obligation, 0.0%, 9/29/12 (144A) 
  2,926,587 
   
  1,500,000 
NR/NR
Red River Health Facilities Development Corp., Revenue, 8.0%, 11/15/41   
  1,606,290 
   
  4,000,000 
NR/NR
Sanger Industrial Development Corp., Revenue, 8.0%, 7/1/38   
  4,020,680 
   
  7,040,000(e)
AAA/Aaa
State of Texas, General Obligation, 0.0%, 4/1/30   
  7,904,794 
   
  2,000,000 
NR/NR
Tarrant County Cultural Education Facilities Finance Corp., Revenue, 8.0%, 11/15/34   
  2,143,040 
   
  1,000,000 
NR/NR
Tarrant County Cultural Education Facilities Finance Corp., Revenue, 8.125%, 11/15/39
  1,046,350 
   
  1,500,000 
NR/NR
Tarrant County Cultural Education Facilities Finance Corp., Revenue, 8.25%, 11/15/44
  1,571,790 
   
  2,500,000 
NR/NR
Travis County Health Facilities Development Corp., Revenue, 7.125%, 1/1/46   
  2,489,625 
         
$ 53,133,965 
       
Virginia - 0.3%
 
   
  1,000,000 
BBB-/Ba1
Peninsula Ports Authority Revenue, 6.0%, 4/1/33   
$ 1,001,940 
           
       
Washington - 7.1%
 
   
  14,315,000(d)
AA+/Aa1
State of Washington, General Obligation, 0.0%, 6/1/22   
$ 11,294,821 
   
  3,795,000 
A/A2
Washington State Health Care Facilities Authority Revenue, 6.0%, 1/1/33   
  4,026,495 
   
  1,150,000 
NR/NR
Washington State Housing Finance Commission Revenue, 6.75%, 10/1/47   
  1,038,761 
   
  5,000,000 
NR/NR
Washington State Housing Finance Committee Nonprofit Revenue, 5.625%, 1/1/27   
  4,592,550 
         
$ 20,952,627 
       
West Virginia - 0.9%
 
   
  2,000,000 
NR/NR
City of Philippi WV, 7.75%, 10/1/44   
$ 1,903,520 
   
  740,000 
NR/NR
West Virginia Hospital Finance Authority Hospital Revenue, 9.125%, 10/1/41   
  890,375 
         
$ 2,793,895 
       
Wisconsin - 2.9%
 
   
  5,000,000 
NR/NR
Wisconsin Public Finance Authority Continuing Care Retirement Community Revenue, 8.25%, 6/1/46   
$ 5,540,800 
   
  1,500,000 
NR/NR
Wisconsin State Public Finance Authority Revenue, 8.375%, 6/1/20   
  1,500,915 
           

   
Principal
Amount
USD ($)
S&P/Moody's
Ratings             
 
Value
 
       
Wisconsin - (continued)
 
   
  1,500,000 
NR/NR
Wisconsin State Public Finance Authority Revenue, 8.625%, 6/1/47   
$ 1,558,725 
         
$ 8,600,440 
       
TOTAL TAX EXEMPT OBLIGATIONS
 
       
(Cost $374,428,277)
$ 387,502,380 
       
MUNICIPAL COLLATERALIZED DEBT OBLIGATION -  0.7% of Net Assets
 
   
  10,000,000(c)(e)
NR/NR
Non-Profit Preferred Funding Trust I, 0.0%, 9/15/37 (144A) 
$ 2,085,600 
           
       
TOTAL MUNICIPAL COLLATERALIZED DEBT OBLIGATION
 
       
(Cost  $10,000,000)
$ 2,085,600 
           
           
       
TOTAL INVESTMENTS IN SECURITIES - 132.2%
 
       
(Cost - $384,428,277) (g) (h)
$ 389,587,980 
       
OTHER ASSETS AND LIABILITIES -2.1%
$ 6,135,000 
       
PREFERRED SHARES AT REDEMPTION VALUE, INCLUDING DIVIDENDS PAYABLE - (34.3)%
$ (101,000,648)
       
NET ASSETS APPLICABLE TO
COMMON SHAREOWNERS -100.0%
$ 294,722,332 
 
†              Amount rounds to less than 0.1%.
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 January 31, 2014, the value of these securities amounted to $44,713,618, or 15.2% 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 January 31, 2014
 
 
 
(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)
Indicates a security that has been deemed as illiquid.  As of January 31, 2014 the aggregate cost of illiquid securities in the Trust's portfolio was $25,279,489.  As of that date, the aggregate value of illiquid securities in the Trust's portfolio of $10,939,270 represented 3.7% of total net assets applicable to common shareowners.
(d)
Security issued with a zero coupon.  Income is recognized through accretion of discount.
(e)
The interest rate is subject to change periodically. The interest is shown is the rate at January 31, 2014.
(f)
Security is valued using fair value methods (other than prices supplied by independent pricing services).
 
 
(g)
The concentration of investments by type of obligation/ market sector is as follows :
 
 
   Insured
 
NATL-RE
4.0
%
 
FSA
3.5
 
 
NATL-RE FGIC
2.9
 
 
AMBAC GO OF INSTN
2.1
 
 
PSF-GTD
0.8
 
 
   Revenue Bonds:
 
Health Revenue
18.3
 
 
Development Revenue
16.7
 
 
Facilities Revenue
14.0
 
 
Other Revenue
13.2
 
 
Education Revenue
7.8
 
 
Tobacco Revenue
5.6
 
 
Airport Revenue
4.9
 
 
Transportation Revenue
3.7
 
 
Pollution Control Revenue
1.3
 
 
Water Revenue
1.2
 
 
Utilities Revenue
0.0*
 
   
100.0
%
 
*      Amount is less than 0.1%

 
 

 


(h) At January 31, 2014, the net unrealized appreciation on investments based on cost for federal tax purposes of $384,283,349 was as follows:
           
             
Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost
    $ 30,256,252          
Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value
      (24,951,621 )        
                     
Net unrealized appreciation
    $ 5,304,631          
                     
For financial reporting purposes net unrealized appreciation on investments was $5,159,703 and cost of investments aggregated $384,428,277.
     
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 January 31, 2014, in valuing the Trust's investments.
 
                   
   
Level 1
   
Level 2
   
Level 3
Total
 
                   
                   
Tax Exempt Obligations
  $     $ 384,547,380     $ 2,955,000     $ 387,502,380  
                                     
                                     
Municipal Collateralized Debt Obligation
          2,085,600             2,085,600  
Total Investments in Securities
  $     $ 386,632,980     $ 2,955,000     $ 389,587,980  
 
 
 

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
1/31/14
 
   
                                                       
Tax Exempt Obligations
  $ - **    $ 10,319     $ (126,047 )   $     $ (10,319 )   $ 3,197     $ 3,077,850     $     $ 2,955,000  
                                                                         
Total
  $ - **   $ 10,319     $ (126,047 )   $     $ (10,319 )   $ 3,197     $ 3,077,850     $     $ 2,955,000  
       
*  Transfers are calculated on the beginning of period value
** Includes security that is fair valued at $0.
 
Net change in unrealized appreciation of Level 3 investments still held and considered
Level 3 at 01/31/14: ($126,047)
 
   

ITEM 2. CONTROLS AND PROCEDURES.

(a) Disclose the conclusions of the registrant's principal executive
and principal financial officers, or persons performing similar functions,
regarding 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 the
evaluation of these controls and procedures required by Rule 30a-3(b)
under the Act (17 CFR 270.30a-3(b))) and Rule 13a-15(b) or 15d-15(b)
under the Exchange Act (17 CFR 240.13a-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 CFR 270.30a-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.

File as exhibits as part of this Form a separate certification for each principal
executive officer and principal financial officer of the registrant as required
by Rule 30a-2(a) under the Act (17 CFR 270.30a-2(a)), exactly as set forth below:

                             CERTIFICATIONS

I, [identify the certifying individual], certify that:

1.  I have reviewed this report on Form N-Q of [identify registrant];

2.  Based on my knowledge, this report does not contain any untrue statement of
a material fact or omit to state a material fact necessary to make the statements
made, in light of the circumstances under which such statements were made, not
misleading with respect to the period covered by this report;

3.  Based on my knowledge, the schedules of investments included in this report
fairly present in all material respects the investments of the registrant as of
the end of the fiscal quarter for which the report is filed;

4.  The registrants other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over
financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act
of 1940) for the registrant and have:

  (a)  Designed such disclosure controls and procedures, or caused such
  disclosure controls and procedures to be designed under our supervision, to
  ensure that material information relating to the registrant, including its
  consolidated subsidiaries, is made known to us by others within those entities,
  particularly during the period in which this report is being prepared;

  (b)  Designed such internal control over financial reporting, or caused such
  internal control over financial reporting to be designed under our supervision,
  to provide reasonable assurance regarding the reliability of financial
  reporting and the preparation of financial statements for external purposes
  in accordance with generally accepted accounting principles;

  (c)  Evaluated the effectiveness of the registrants disclosure controls and
  procedures and presented in this report our conclusions about the effectiveness
  of the disclosure controls and procedures, as of a date within 90 days prior to
  the filing date of this report, based on such evaluation; and

  (d)  Disclosed in this report any change in the registrants internal control
  over financial reporting that occurred during the registrants most recent
  fiscal quarter that has materially affected, or is reasonably likely to
  materially affect, the registrants internal control over financial reporting;
  and

5.  The registrants other certifying officer(s) and I have disclosed to the
registrants auditors and the audit committee of the registrants board of
directors (or persons performing the equivalent functions):

  (a)  All significant deficiencies and material weaknesses in the design or operation
  of internal control over financial reporting which are reasonably likely to adversely
  affect the registrants ability to record, process, summarize, and report financial
  information; and

  (b)  Any fraud, whether or not material, that involves management or other employees
  who have a significant role in the registrants internal control over financial
  reporting.


Date:                                                  [Signature] [Title]


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 Pioneer Municipal High Income Trust

By (Signature and Title)* /s/ Daniel K. Kingsbury
                          -----------------------
                          Daniel K. Kingsbury, President

Date April 1, 2014

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/ Daniel K. Kingsbury
                          -----------------------
                          Daniel K. Kingsbury, President

Date April 1, 2014



By (Signature and Title)* /s/ Mark Bradley
                          -----------------
                          Mark Bradley, Treasurer

Date April 1, 2014

* Print the name and title of each signing officer under his or her signature.