-----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,
 VwhmDQ0JE5pozl9Vl5UwnXuzvOClM5Vi3tSa0h8zHckklZxCIRB785Awvtibn0cP
 LR1h/B0iQiN8vqkxQiQQKw==

<SEC-DOCUMENT>0000930413-03-003176.txt : 20031030
<SEC-HEADER>0000930413-03-003176.hdr.sgml : 20031030
<ACCEPTANCE-DATETIME>20031030153452
ACCESSION NUMBER:		0000930413-03-003176
CONFORMED SUBMISSION TYPE:	NSAR-B
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20030831
FILED AS OF DATE:		20031030
EFFECTIVENESS DATE:		20031030

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK INSURED MUNICIPAL INCOME TRUST
		CENTRAL INDEX KEY:			0001181187
		IRS NUMBER:				816105962
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0831

	FILING VALUES:
		FORM TYPE:		NSAR-B
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-21178
		FILM NUMBER:		03966626

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		STREET 2:		MUTUAL FUND DEPARTMENT
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		302-797-2449

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK MUNICIPAL INCOME TRUST III
		DATE OF NAME CHANGE:	20020819
</SEC-HEADER>
<DOCUMENT>
<TYPE>NSAR-B
<SEQUENCE>1
<FILENAME>c29718_nsar-b.fil
<TEXT>
<PAGE>      PAGE  1
000 B000000 08/31/2003
000 C000000 0001181187
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 BLACKROCK INSURED MUNICIPAL INCOME TRUST
001 B000000 811-21178
001 C000000 3027972162
002 A000000 100 BELLEVUE PARKWAY
002 B000000 WILMINGTON
002 C000000 DE
002 D010000 19809
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 BLACKROCK ADVISORS, INC.
008 B000001 A
008 C000001 801-47710
008 D010001 WILMINGTON
008 D020001 DE
008 D030001 19809
008 A000002 BLACKROCK FINANCIAL MANAGEMENT,INC.
008 B000002 S
008 C000002 801-48433
008 D010002 NEW YORK
008 D020002 NY
008 D030002 10022
012 A000001 EQUISERVE TRUST COMPANY, NA
012 B000001 85-11340
012 C010001 CANTON
012 C020001 MA
012 C030001 02021
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 BOSTON
<PAGE>      PAGE  2
013 B020001 MA
013 B030001 02116
014 A000001 BLACKROCK INVESTMENTS, INC.
014 B000001 8-048436
014 A000002 NORTHERN FUND DISTRIBUTORS, LLC
014 B000002 8-051242
014 A000003 PNC CAPITAL MARKETS, INC.
014 B000003 8-032493
014 A000004 J.J.B. HILLIARD W.L. LYONS, INC.
014 B000004 8-033133
014 A000005 PFPC DISTRIBUTORS, INC.
014 B000005 8-045467
014 A000006 OFFIT FUNDS DISTRIBUTOR, INC.
014 B000006 8-046960
014 A000007 ABN AMRO DISTRIBUTION SERVICES (USA), INC.
014 B000007 8-052396
014 A000008 BLACKROCK DISTRIBUTORS, INC.
014 B000008 8-048775
015 A000001 STATESTREET BANK AND TRUST COMPANY
015 B000001 C
015 C010001 NORTH QUINCY
015 C020001 MA
015 C030001 02171
015 E010001 X
015 A000002 PRUDENTIAL SECURITIES, INC.
015 B000002 C
015 C010002 SPRING LAKE
015 C020002 NJ
015 C030002 07762
015 C040002 1443
015 E020002 X
018  000000 Y
019 A000000 Y
019 B000000   46
019 C000000 BLACKROCKF
020 A000001 PRUDENTIAL SECURITIES, INC.
020 B000001 22-2347336
020 C000001      0
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        0
022 A000001 STATE STREET BANK
022 B000001 04-1867445
022 C000001    218000
<PAGE>      PAGE  3
022 D000001    217750
022 A000002 UBS FINANCIAL SERVICES
022 B000002 13-3873456
022 C000002    125748
022 D000002    127891
022 A000003 CHASE SECURITIES INC.
022 B000003 13-3379014
022 C000003    292058
022 D000003     25246
022 A000004 GOLDMAN SACHS & CO.
022 B000004 13-5108880
022 C000004    154887
022 D000004     22671
022 A000005 LEHMAN BROTHERS INC.
022 B000005 13-2726611
022 C000005     96126
022 D000005     66403
022 A000006 CITIGROUP GLOBAL MARKETS
022 B000006 11-2418191
022 C000006    103896
022 D000006     53079
022 A000007 RAYMOND JAMES & ASSOCIATES
022 B000007 59-1237041
022 C000007    110616
022 D000007     12279
022 A000008 MERRILL LYNCH PIERCE
022 B000008 13-5674085
022 C000008     55609
022 D000008     24529
022 A000009 DBTC AMERICAS/BANC ONE
022 B000009 36-3595942
022 C000009     20528
022 D000009     30900
022 A000010 MORGAN STANLEY
022 B000010 13-2655998
022 C000010      6215
022 D000010     20852
023 C000000    1296874
023 D000000     691491
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 N
026 C000000 N
<PAGE>      PAGE  4
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
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
<PAGE>      PAGE  5
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  0.550
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 N
053 C000000 N
054 A000000 Y
054 B000000 Y
054 C000000 N
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 N
054 M000000 Y
<PAGE>      PAGE  6
054 N000000 N
054 O000000 N
055 A000000 Y
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   0.4
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 157.1
062 P000000   0.0
062 Q000000   0.0
062 R000000   0.1
063 A000000   0
063 B000000 27.0
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 N
070 F010000 N
070 F020000 N
070 G010000 Y
<PAGE>      PAGE  7
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 Y
070 L010000 N
070 L020000 N
070 M010000 N
070 M020000 N
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 Y
070 P010000 Y
070 P020000 Y
070 Q010000 N
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000    818969
071 B000000    245226
071 C000000    528950
071 D000000   46
072 A000000 10
072 B000000    24028
072 C000000        0
072 D000000        0
072 E000000        0
072 F000000     1662
072 G000000        0
072 H000000        0
072 I000000       15
072 J000000       34
072 K000000        0
072 L000000       55
072 M000000       43
072 N000000       26
072 O000000        0
072 P000000        0
072 Q000000        0
072 R000000       38
072 S000000       27
072 T000000        0
072 U000000       15
072 V000000        0
072 W000000      495
072 X000000     2410
<PAGE>      PAGE  8
072 Y000000        0
072 Z000000    21618
072AA000000        0
072BB000000     4190
072CC010000        0
072CC020000    11769
072DD010000    20039
072DD020000        0
072EE000000        0
073 A010000   0.7031
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000      540
074 B000000        0
074 C000000     1640
074 D000000   560112
074 E000000        0
074 F000000        0
074 G000000        0
074 H000000        0
074 I000000        0
074 J000000    19868
074 K000000        0
074 L000000     5522
074 M000000       76
074 N000000   587759
074 O000000        0
074 P000000     2041
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000      279
074 S000000   229001
074 T000000   356438
074 U010000    26125
074 U020000        0
074 V010000    13.64
074 V020000     0.00
074 W000000   0.0000
074 X000000       97
074 Y000000        0
075 A000000        0
075 B000000   372269
076  000000    13.51
077 A000000 Y
077 B000000 Y
077 Q010000 N
077 Q020000 N
077 Q030000 N
<PAGE>      PAGE  9
078  000000 N
080 A000000 VIGILANT INSURANCE COMPANY
080 B000000 GULF INSURANCE GROUP
080 C000000    30000
081 A000000 Y
081 B000000  48
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  26125
086 A020000 370804
086 B010000      0
086 B020000      0
086 C010000      9
086 C020000 228975
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
087 A010000 COMMON
087 A020000 092479104
087 A030000 BYM
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE   HENRY GABBAY
TITLE       TREASURER


</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77B
<SEQUENCE>3
<FILENAME>c29718_ex99-77b.txt
<TEXT>
                                                                       EX-99.77B

INDEPENDENT AUDITORS' REPORT


To the Trustees and Shareholders of

   BlackRock Municipal Bond Trust
   BlackRock California Municipal Bond Trust
   BlackRock Florida Municipal Bond Trust
   BlackRock Maryland Municipal Bond Trust
   BlackRock New Jersey Municipal Bond Trust
   BlackRock New York Municipal Bond Trust
   BlackRock Virginia Municipal Bond Trust
   BlackRock Insured Municipal Income Trust
   BlackRock California Insured Municipal Income Trust
   BlackRock Florida Insured Municipal Income Trust
   BlackRock New York Insured Municipal Income Trust
   BlackRock Municipal Income Trust II
   BlackRock California Insured Municipal Income Trust II
   BlackRock New York Insured Municipal Income Trust II:

In planning and performing  our audits of the financial  statements of BlackRock
Closed-End  Funds  listed (the  "Funds")  for the year ended August 31, 2003 (on
which we have issued our reports dated October 10,  2003),  we considered  their
internal control,  including control activities for safeguarding securities,  in
order to determine our auditing  procedures  for the purpose of  expressing  our
opinion on the financial  statements and to comply with the requirements of Form
N-SAR and not to provide assurance on the Funds' internal control.

The  management of the Funds is responsible  for  establishing  and  maintaining
internal control. In fulfilling this responsibility,  estimates and judgments by
management  are  required to assess the expected  benefits and related  costs of
controls.  Generally,  controls  that are  relevant  to an audit  pertain to the
entity's objective of preparing financial  statements for external purposes that
are fairly presented in conformity with accounting principles generally accepted
in the United States of America.  Those  controls  include the  safeguarding  of
assets against unauthorized acquisition, use or disposition.

Because of inherent  limitations in any internal  control,  misstatements due to
error  or  fraud  may  occur  and  not be  detected.  Also,  projections  of any
evaluation  of internal  control to future  periods are subject to the risk that
the internal control may become  inadequate  because of changes in conditions or
that the degree of compliance with policies or procedures may deteriorate.

Our consideration of the Funds' internal control would not necessarily  disclose
all  matters  in  internal  control  that  might be  material  weaknesses  under
standards established by the American Institute of Certified Public Accountants.
A material  weakness is a condition  in which the design or  operation of one or
more of the internal  control  components  does not reduce to a  relatively  low
level the risk that misstatements caused by error or fraud in amounts that would
be material in relation to the financial  statements being audited may occur and
not be detected  within a timely  period by  employees  in the normal  course of
performing their assigned functions.  However, we noted no matters involving the
Funds' internal control and its operation,  including  controls for safeguarding
securities  that we consider to be material  weaknesses  as defined  above as of
August 31, 2003.

<PAGE>


This report is intended solely for the  information  and use of management,  the
trustees and shareholders of the above referenced  BlackRock  Closed-End  Funds,
and the Securities and Exchange  Commission and is not intended to be and should
not be used by anyone other than these specified parties.


/s/ Deloitte & Touche LLP

Boston, Massachusetts
October 10, 2003

</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
