PAGE 1
000 A000000 04/30/2004
000 C000000 0000885601
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 MS INSURED MUNICIPAL INCOME TRUST
001 B000000 811-06590
001 C000000 2127625260
002 A000000 1221 AVENUE OF THE AMERICAS
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10020
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
007 C010200 2
007 C010300 3
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A000001 MORGAN STANLEY INVESTMENT ADVISORS INC.
008 B000001 A
008 C000001 801-42061
008 D010001 NEW YORK
008 D020001 NY
008 D030001 10020
012 A000001 MORGAN STANLEY TRUST
012 B000001 84-5710
012 C010001 JERSEY CITY
012 C020001 NJ
012 C030001 07311
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 NEW YORK
013 B020001 NY
013 B030001 10281
014 A000001 ARAB MALAYSIA SECURITIES
014 B000001 8-00000
014 A000002 CHINA INTERNATIONAL CAPITAL CORPORATION LTD
014 B000002 8-00000
PAGE 2
014 A000003 HC SECURITIES
014 B000003 8-00000
014 A000004 JM MS FIXED INCOME SECURITIES PRIVATE LIMITED
014 B000004 8-00000
014 A000005 JM MORGAN STANLEY PRIVATE LIMITED
014 B000005 8-00000
014 A000006 JM MORGAN STANLEY SECURITIES PRIVATE LIMITED
014 B000006 8-00000
014 A000007 JM MORGAN STANLEY RETAIL SERVICES PRIVATE LTD
014 B000007 8-00000
014 A000008 MORGAN STANLEY & CO. INCORPORATED
014 B000008 8-15869
014 A000009 MORGAN STANLEY & CO. LIMITED
014 B000009 8-00000
014 A000010 MORGAN STANLEY ASIA LIMITED
014 B000010 8-00000
014 A000011 MORGAN STANLEY CANADA LIMITED
014 B000011 8-00000
014 A000012 MORGAN STANLEY QUILTER LIMITED
014 B000012 8-00000
014 A000013 MS DEAN WITTER AUSTRALIA SECURITIES LIMITED
014 B000013 8-00000
014 A000014 MORGAN STANLEY JAPAN LIMITED
014 B000014 8-00000
014 A000015 MORGAN STANLEY NIPPON SECURITIES, LTD.
014 B000015 8-00000
014 A000016 MORGAN STANLEY, S.V., S.A.
014 B000016 8-00000
014 A000017 MORGAN STANLEY DW INC.
014 B000017 8-14172
014 A000018 MORGAN STANLEY INTERNATIONAL LIMITED
014 B000018 8-00000
014 A000019 MORGAN STANLEY SECURITIES LIMITED
014 B000019 8-00000
014 A000020 MORGAN STANLEY BANK AG
014 B000020 8-00000
014 A000021 MORGAN STANLEY DISTRIBUTION INC.
014 B000021 8-44766
014 A000022 MORGAN STANLEY DISTRIBUTORS INC.
014 B000022 8-45262
014 A000023 MORGAN STANLEY MARKET PRODUCTS INC.
014 B000023 8-37795
014 A000024 MS SECURITIES SERVICES INC.
014 B000024 8-26804
014 A000025 PRIME DEALER SERVICES CORP.
014 B000025 8-47025
014 A000026 VAN KAMPEN FUNDS INC.
014 B000026 8-19412
015 A000001 THE BANK OF NEW YORK
015 B000001 C
015 C010001 NEW YORK
PAGE 3
015 C020001 NY
015 C030001 10286
015 E010001 X
018 000000 Y
019 A000000 Y
019 B000000 114
019 C000000 MORGANSTAN
020 A000001 GOLDMAN SACHS & CO.
020 B000001 13-5108880
020 C000001 15
020 C000002 0
020 C000003 0
020 C000004 0
020 C000005 0
020 C000006 0
020 C000007 0
020 C000008 0
020 C000009 0
020 C000010 0
021 000000 15
022 A000001 MORGAN GUARANTY TRUST CO. OF N.Y.
022 B000001 13-3224016
022 C000001 37350
022 D000001 33700
022 A000002 MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
022 B000002 13-5674085
022 C000002 33260
022 D000002 28765
022 A000003 EDWARDS (A.G.) & SONS, INC.
022 B000003 43-0895447
022 C000003 0
022 D000003 6677
022 A000004 STONE & YOUNGBERG
022 B000004 94-1052545
022 C000004 4140
022 D000004 1658
022 A000005 RAYMOND JAMES & ASSOCIATES, INC.
022 B000005 59-1237041
022 C000005 0
022 D000005 5044
022 A000006 SEATTLE-NORTHWEST SECURITIES CORP.
022 B000006 91-1172183
022 C000006 2188
022 D000006 2225
022 A000007 GOLDMAN, SACHS & CO.
022 B000007 13-5108880
022 C000007 4254
022 D000007 0
022 A000008 CITIGROUP GLOBAL MARKETS INC.
022 B000008 11-2418191
022 C000008 0
PAGE 4
022 D000008 3319
022 A000009 PAINEWEBBER INC.
022 B000009 13-2638166
022 C000009 0
022 D000009 2029
022 A000010 BEAR, STEARNS & CO. INC.
022 B000010 13-3299429
022 C000010 0
022 D000010 2021
023 C000000 81192
023 D000000 93972
024 000000 N
025 D000001 0
025 D000002 0
025 D000003 0
025 D000004 0
025 D000005 0
025 D000006 0
025 D000007 0
025 D000008 0
026 A000000 N
026 B000000 Y
026 C000000 Y
026 D000000 Y
026 E000000 N
026 F000000 Y
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
PAGE 5
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
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 0.350
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
PAGE 6
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 N
054 A000000 Y
054 B000000 Y
054 C000000 Y
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 Y
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 Y
054 M000000 Y
054 N000000 N
054 O000000 Y
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 5.3
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 134.2
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
063 A000000 0
PAGE 7
063 B000000 19.0
064 A000000 Y
064 B000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 Y
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 Y
070 E020000 Y
070 F010000 N
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 N
070 K010000 Y
070 K020000 N
070 L010000 N
070 L020000 N
070 M010000 N
070 M020000 N
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 20032
071 B000000 38519
071 C000000 520017
071 D000000 4
072 A000000 6
072 B000000 13015
072 C000000 0
PAGE 8
072 D000000 0
072 E000000 0
072 F000000 935
072 G000000 0
072 H000000 0
072 I000000 86
072 J000000 5
072 K000000 0
072 L000000 22
072 M000000 7
072 N000000 8
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 22
072 S000000 13
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 430
072 X000000 1528
072 Y000000 5
072 Z000000 11492
072AA000000 1338
072BB000000 7974
072CC010000 327
072CC020000 0
072DD010000 12749
072DD020000 0
072EE000000 6941
073 A010000 0.4650
073 A020000 0.0000
073 B000000 0.2871
073 C000000 0.0000
074 A000000 20
074 B000000 0
074 C000000 19438
074 D000000 486942
074 E000000 0
074 F000000 0
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 3538
074 K000000 0
074 L000000 8365
074 M000000 714
074 N000000 519017
074 O000000 0
074 P000000 193
074 Q000000 0
PAGE 9
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 660
074 S000000 155212
074 T000000 362952
074 U010000 23919
074 U020000 0
074 V010000 15.17
074 V020000 0.00
074 W000000 0.0000
074 X000000 4086
074 Y000000 1586
075 A000000 0
075 B000000 379397
076 000000 13.64
077 A000000 Y
077 B000000 N
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 Y
077 P000000 N
077 Q010000 Y
077 Q020000 N
077 Q030000 N
078 000000 N
080 C000000 0
081 B000000 0
082 B000000 0
083 B000000 0
084 B000000 0
086 A010000 0
086 A020000 0
086 B010000 321
086 B020000 4686
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
PAGE 10
086 F010000 0
086 F020000 0
087 A010000 SHARES OF BENEFICIAL INTEREST
087 A020000 61745P791
087 A030000 IIM
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE A. THOMAS SMITH
TITLE VICE PRESIDENT