-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 HN6xij4PsRB+4AtQqJ2be9Lu22LSzT1ZP927wirXbl3IeZDv9/6OEyAC5FWgyxXa
 JpusMu4uAOEvTQ1Gmq3NUQ==

<SEC-DOCUMENT>0000912938-10-000490.txt : 20101118
<SEC-HEADER>0000912938-10-000490.hdr.sgml : 20101118
<ACCEPTANCE-DATETIME>20101118162228
ACCESSION NUMBER:		0000912938-10-000490
CONFORMED SUBMISSION TYPE:	NSAR-B/A
PUBLIC DOCUMENT COUNT:		4
CONFORMED PERIOD OF REPORT:	20091130
FILED AS OF DATE:		20101118
DATE AS OF CHANGE:		20101118
EFFECTIVENESS DATE:		20101118

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MFS HIGH YIELD MUNICIPAL TRUST
		CENTRAL INDEX KEY:			0000809844
		IRS NUMBER:				042950868
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1130

	FILING VALUES:
		FORM TYPE:		NSAR-B/A
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-04992
		FILM NUMBER:		101203057

	BUSINESS ADDRESS:	
		STREET 1:		500 BOYLSTON ST
		STREET 2:		20TH FL LEGAL DEPT.
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		6179545000

	MAIL ADDRESS:	
		STREET 1:		500 BOYLSTON ST
		STREET 2:		20TH FL LEGAL DEPT
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COLONIAL MUNICIPAL INCOME TRUST
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>NSAR-B/A
<SEQUENCE>1
<FILENAME>answer2.fil
<TEXT>
<PAGE>      PAGE  1
000 B000000 11/30/2009
000 C000000 0000809844
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 Y
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 MFS High Yield Municipal Trust
001 B000000 811-4992
001 C000000 6179545000
002 A000000 500 Boylston Street
002 B000000 Boston
002 C000000 MA
002 D010000 02116
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
007 B000000  0
007 C010100  1
008 A000001 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B000001 A
008 C000001 801-17352
008 D010001 BOSTON
008 D020001 MA
008 D030001 02116
010 A000001 MASSACHUSETTS FINANCIAL SERVICES
010 B000001 801-17352
010 C010001 BOSTON
010 C020001 MA
010 C030001 02116
012 A000001 COMPUTERSHARE TRUST COMPANY, N.A.
012 B000001 85-1134
012 C010001 PROVIDENCE
012 C020001 RI
012 C030001 02940
012 A000002 MFS SERVICE CENTER, INC.
012 B000002 84-1316
012 C010002 BOSTON
012 C020002 MA
012 C030002 02116
013 A000001 ERNST & YOUNG LLP
013 B010001 BOSTON
013 B020001 MA
013 B030001 02116
015 A000001 STATE STREET BANK AND TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
<PAGE>      PAGE  2
015 C020001 MA
015 C030001 02110
015 E010001 X
015 A000002 THE BANK OF NEW YORK
015 B000002 S
015 C010002 NEW YORK
015 C020002 NY
015 C030002 10286
015 E010002 X
015 A000003 MERRILL LYNCH, PIERCE, FENNER & SMITH
015 B000003 S
015 C010003 CHICAGO
015 C020003 IL
015 C030003 60606
015 E010003 X
018  000000 Y
019 A000000 N
019 B000000    0
021  000000        0
022 A000001 CITIGROUP, INC.
022 B000001 13-3187336
022 C000001     12260
022 D000001      7207
022 A000002 BANK OF NEW YORK CO., INC.
022 B000002 13-3878175
022 C000002      2758
022 D000002      9514
022 A000003 MORGAN STANLEY
022 B000003 13-2655998
022 C000003      6210
022 D000003      1935
022 A000004 JPMORGAN CHASE & CO.
022 B000004 13-3224017
022 C000004      3995
022 D000004      1994
022 A000005 GOLDMAN SACHS GROUP, INC.
022 B000005 13-5108880
022 C000005      4960
022 D000005       431
022 A000006 RAYMOND JAMES FINANCIAL INC.
022 B000006 00-0000000
022 C000006      2477
022 D000006      2079
022 A000007 WELLS FARGO & COMPANY
022 C000007      2579
022 D000007      1172
022 A000008 ROYAL BANK OF CANADA FINANCIAL GROUP
022 B000008 00-0000000
022 C000008      1780
022 D000008       545
022 A000009 PIPER JAFFRAY & CO.
<PAGE>      PAGE  3
022 B000009 41-0953246
022 C000009       286
022 D000009      2020
022 A000010 BARCLAY'S INVESTMENTS, INC.
022 B000010 05-0346412
022 C000010      3818
022 D000010         0
023 C000000      50649
023 D000000      40157
024  000000 N
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 N
028 A010000         0
028 A020000         0
028 A030000         0
028 A040000         0
028 B010000         0
028 B020000         0
028 B030000         0
028 B040000         0
028 C010000         0
028 C020000         0
028 C030000         0
028 C040000         0
028 D010000         0
028 D020000         0
028 D030000         0
028 D040000         0
028 E010000         0
028 E020000         0
028 E030000         0
028 E040000         0
028 F010000         0
028 F020000         0
028 F030000         0
028 F040000         0
028 G010000         0
028 G020000         0
028 G030000         0
028 G040000         0
028 H000000         0
030 A000000      0
030 B000000  0.00
<PAGE>      PAGE  4
030 C000000  0.00
031 A000000      0
031 B000000      0
032  000000      0
033  000000      0
035  000000      0
036 B000000      0
038  000000      0
042 A000000   0
042 B000000   0
042 C000000   0
042 D000000   0
042 E000000   0
042 F000000   0
042 G000000   0
042 H000000   0
043  000000      0
044  000000      0
045  000000 Y
046  000000 N
047  000000 Y
048  000000  0.650
048 A010000        0
048 A020000 0.000
048 B010000        0
048 B020000 0.000
048 C010000        0
048 C020000 0.000
048 D010000        0
048 D020000 0.000
048 E010000        0
048 E020000 0.000
048 F010000        0
048 F020000 0.000
048 G010000        0
048 G020000 0.000
048 H010000        0
048 H020000 0.000
048 I010000        0
048 I020000 0.000
048 J010000        0
048 J020000 0.000
048 K010000        0
048 K020000 0.000
049  000000 N
050  000000 N
051  000000 N
052  000000 N
053 A000000 Y
053 B000000 Y
053 C000000 N
<PAGE>      PAGE  5
054 A000000 Y
054 B000000 N
054 C000000 N
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 N
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 N
055 A000000 N
055 B000000 N
056  000000 Y
057  000000 N
058 A000000 N
059  000000 Y
060 A000000 Y
060 B000000 Y
061  000000        0
062 A000000 Y
062 B000000   0.0
062 C000000   0.0
062 D000000   0.0
062 E000000   0.0
062 F000000   0.0
062 G000000   0.0
062 H000000   0.0
062 I000000   0.0
062 J000000   0.0
062 K000000   0.0
062 L000000   0.0
062 M000000   0.0
062 N000000   0.0
062 O000000 159.5
062 P000000   0.0
062 Q000000   0.0
062 R000000   0.0
063 A000000   0
063 B000000 17.5
064 A000000 Y
064 B000000 Y
065  000000 N
066 A000000 N
067  000000 N
068 A000000 N
068 B000000 N
<PAGE>      PAGE  6
069  000000 N
070 A010000 Y
070 A020000 N
070 B010000 Y
070 B020000 N
070 C010000 Y
070 C020000 N
070 D010000 Y
070 D020000 N
070 E010000 Y
070 E020000 Y
070 F010000 Y
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 Y
070 H020000 N
070 I010000 Y
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 Y
070 K020000 Y
070 L010000 Y
070 L020000 N
070 M010000 Y
070 M020000 N
070 N010000 Y
070 N020000 N
070 O010000 N
070 O020000 N
070 P010000 Y
070 P020000 Y
070 Q010000 N
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000     37158
071 B000000     29047
071 C000000    170217
071 D000000   17
072 A000000 12
072 B000000    12086
072 C000000        0
072 D000000        0
072 E000000        0
072 F000000     1160
072 G000000       41
072 H000000        0
072 I000000       47
072 J000000       23
<PAGE>      PAGE  7
072 K000000        0
072 L000000       67
072 M000000       23
072 N000000       25
072 O000000        0
072 P000000        0
072 Q000000        0
072 R000000       82
072 S000000       13
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000      188
072 X000000     1669
072 Y000000      120
072 Z000000    10537
072AA000000     2167
072BB000000     8057
072CC010000    24660
072CC020000        0
072DD010000     9209
072DD020000        0
072EE000000        0
073 A010000   0.3300
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000     2577
074 B000000        0
074 C000000        0
074 D000000   186406
074 E000000        0
074 F000000        0
074 G000000        0
074 H000000        0
074 I000000        0
074 J000000      150
074 K000000        0
074 L000000     3326
074 M000000       14
074 N000000   192473
074 O000000      455
074 P000000       34
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000      114
074 S000000    75000
074 T000000   116870
074 U010000    27954
<PAGE>      PAGE  8
074 U020000        0
074 V010000     4.18
074 V020000     0.00
074 W000000   0.0000
074 X000000     1430
074 Y000000      571
075 A000000        0
075 B000000   103603
076  000000     4.24
077 A000000 Y
077 B000000 Y
077 H000000 Y
077 Q010000 Y
077 Q020000 N
077 Q030000 N
078  000000 N
080 A000000 ICI MUTUAL/CHUBB (co-surety)
080 B000000 Zurich
080 C000000    53000
081 A000000 Y
081 B000000 135
082 A000000 N
082 B000000        0
083 A000000 N
083 B000000        0
084 A000000 N
084 B000000        0
085 A000000 Y
085 B000000 N
086 A010000      0
086 A020000      0
086 B010000      0
086 B020000      0
086 C010000      0
086 C020000      0
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
087 A010000 MFS High Yield Municipal Trust
087 A020000 59318E102
087 A030000 CMU
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE   JOHN CORCORAN
TITLE       TREASURER

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77H CHNG CNTRL
<SEQUENCE>2
<FILENAME>h77.txt
<TEXT>
                                                SUB-ITEM 77H

As of November 30, 2009,the following  entity no longer owns 25% or more of the
Fund's voting securities and was previously reported in error:


PERSON/ENTITY                     FUND

Cede & placeCo.                   CMU




</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77B ACCT LTTR
<SEQUENCE>3
<FILENAME>b77_revised.txt
<TEXT>


        Report of Independent Registered Public Accounting Firm

              To the Shareholders and Board of Trustees of
              MFS High Yield Municipal Trust

In planning and  performing  our audit of the  financial statements of MFS High
Yield Municipal Trust (the Fund)as of and for the year ended November 30, 2009,
in accordance  with the standards of the Public  Company  Accounting  Oversight
Board (United States), we considered the Fund's internal control over financial
reporting, including  controls  over  safeguarding  securities,  as a basis for
designing our auditing  procedures for the purpose of expressing our opinion on
the financial statements and to comply with the requirements of Form N-SAR, but
not for the purpose of expressing an opinion on the effectiveness of the Fund's
internal  control  over  financial  reporting.  Accordingly, we express no such
opinion.

The  management of the Fund is  responsible  for establishing  and  maintaining
effective  internal  control  over  financial  reporting. In  fulfilling  this
responsibility, estimates and judgments by management are required to assess the
expected  benefits and related costs of controls. A company's internal control
over financial  reporting is a process designed 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.  A company's  internal control over financial  reporting
includes those policies and  procedures that (1) pertain to the  maintenance of
records  that,  in  reasonable  detail,   accurately  and  fairly  reflect  the
transactions  and  dispositions  of the  assets  of  the  company; (2)  provide
reasonable  assurance  that  transactions  are  recorded as necessary to permit
preparation  of financial  statements  in  accordance  with generally  accepted
accounting  principles,  and that receipts and  expenditures of the company are
being made only in accordance with authorizations of management and directors of
the company; and (3) provide reasonable assurance regarding prevention or timely
detection of unauthorized acquisition, use or disposition of a company's assets
that could have a material effect on the financial statements.

Because of its inherent  limitations, internal control over financial reporting
may not prevent or detect misstatements. Also, projections of any evaluation of
effectiveness to future periods are subject to the risk that controls may become
inadequate  because of changes in  conditions, or that the degree of compliance
with the policies or procedures may deteriorate.

A deficiency in internal control over financial reporting exists when the design
or operation of a control does not allow management or employees,  in the normal
course  of  performing   their   assigned   functions,  to  prevent  or  detect
misstatements  on a timely  basis.  A material  weakness is a  deficiency  or a
combination of deficiencies, in internal control over financial reporting, such
that  there is a  reasonable possibility  that a material  misstatement  of the
company's  annual or  interim  financial  statements  will not be  prevented or
detected on a timely basis.

Our  consideration of the Fund's internal control over financial  reporting was
for  the  limited  purpose  described  in the first  paragraph  and  would  not
necessarily disclose all deficiencies in internal control that might be material
weaknesses  under  standards   established  by the  Public  Company  Accounting
Oversight Board (United States).However, we noted no deficiencies in the Fund's
internal control over financial reporting and its operation,including controls
over  safeguarding  securities,  that we consider  to be a material weakness as
defined above as of November 30, 2009.

This report is intended solely for the information and use of management and the
Board of  Trustees of MFS High Yield  Municipal  Trust and the  Securities  and
Exchange  Commission and is not intended to be and should not be used by anyone
other than these specified parties.

Ernst & Young LLP
Boston, Massachusetts
January 15, 2010

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77Q1 OTHR EXHB
<SEQUENCE>4
<FILENAME>q771.txt
<TEXT>
              http://schemas.microsoft.com/office/word/2003/wordml2450Amendment
Exhibit - Ex. 99.77Q1

The MFS  Series  CMU N-SAR B,  dated  11/30/09,  has been  amended  to correct a
formatting  issue with the Report of Independent  Registered  Public  Accounting
Form.
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
