PAGE  1
000 A000000 04/30/2007
000 C000000 894242
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 INVESTMENT QUALITY MUNICIPAL TRUST
001 B000000 811-07354
001 C000000 8888252257
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
008 A000001 BLACKROCK ADVISORS, LLC
008 B000001 A
008 C000001 801-47710
008 D010001 WILMINGTON
008 D020001 DE
008 D030001 19809
012 A000001 COMPUTERSHARE TRUST COMPANY, NA
012 B000001 85-11340
012 C010001 CANTON
012 C020001 MA
012 C030001 02021
013 A000001 DELOITTE AND TOUCHE LLP
013 B010001 BOSTON
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 MGI FUNDS DISTRIBUTOR, INC.
014 B000006 8-046960
014 A000007 ABN AMRO DISTRIBUTION SERVICES (USA), INC.
      PAGE  2
014 B000007 8-052396
014 A000008 BLACKROCK DISTRIBUTORS, INC.
014 B000008 8-048775
014 A000009 PNC INVESTMENTS LLC
014 B000009 8-066195
014 A000010 PERSIMMON SECURITIES
014 B000010 8-053071
014 A000011 MLPF&S AND OTHER ML BROKER/DEALER AFFILIATES
014 B000011 8-7221
014 A000012 Harris Williams LLC
014 B000012 8-53380
014 A000013 Mercantile Brokerage Services, Inc.
014 B000013 8-18210
014 A000014 Northern Trust Securities, Inc.
014 B000014 8-23689
014 A000015 PNC Brokerage Corp.
014 B000015 8-46315
015 A000001 STATESTREET BANK AND TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02110
015 E010001 X
015 A000002 WACHOVIA SECURITIES
015 B000002 C
015 C010002 SPRING LAKE
015 C020002 NJ
015 C030002 07762
015 C040002 1443
015 E010002 X
018  000000 Y
019 A000000 Y
019 B000000   58
019 C000000 BLACKROCKF
021  000000        0
022 A000001 STATE STREET BANK
022 B000001 04-1867445
022 C000001     46750
022 D000001     54000
022 A000002 BANC OF AMERICA
022 B000002 56-2058405
022 C000002      2146
022 D000002     17516
022 A000003 UBS SECURITIES
022 B000003 13-2932996
022 C000003      5980
022 D000003      8265
022 A000004 CITIGROUP GLOBAL MARKETS
022 C000004     11936
022 D000004         0
022 A000005 GOLDMAN SACHS & CO.
      PAGE  3
022 B000005 13-5108880
022 C000005      4548
022 D000005      3474
022 A000006 LEHMAN BROTHERS
022 B000006 13-2518466
022 C000006      1360
022 D000006      6224
022 A000007 WACHOVIA CAPITAL MARKETS
022 C000007      5391
022 D000007      1775
022 A000008 CHASE SECURITIES, INC.
022 B000008 13-3379014
022 C000008      6912
022 D000008         0
022 A000009 BEAR STEARNS & CO.
022 B000009 13-3299429
022 C000009      3626
022 D000009      3064
022 A000010 PERSHING LLC
022 B000010 13-2741729
022 C000010      2202
022 D000010      4435
023 C000000      99747
023 D000000     101582
024  000000 N
026 A000000 N
026 B000000 N
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
      PAGE  4
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
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
      PAGE  5
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 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
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   1.6
062 M000000   0.0
062 N000000   0.0
      PAGE  6
062 O000000 155.6
062 P000000   0.0
062 Q000000   0.0
062 R000000   0.0
063 A000000   0
063 B000000 32.3
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
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
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 Y
070 O020000 Y
070 P010000 Y
070 P020000 Y
070 Q010000 N
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000     52997
071 B000000     32442
      PAGE  7
071 C000000    398787
071 D000000    8
072 A000000  6
072 B000000    10427
072 C000000       40
072 D000000        0
072 E000000        3
072 F000000      709
072 G000000      302
072 H000000        0
072 I000000        7
072 J000000       43
072 K000000        0
072 L000000       27
072 M000000        9
072 N000000        5
072 O000000        0
072 P000000        1
072 Q000000        0
072 R000000       20
072 S000000       26
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000      228
072 X000000     1377
072 Y000000        0
072 Z000000     9093
072AA000000        0
072BB000000      553
072CC010000        0
072CC020000     1192
072DD010000     8738
072DD020000        0
072EE000000        0
073 A010000   0.5230
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000        0
074 B000000        0
074 C000000        0
074 D000000   404389
074 E000000        0
074 F000000        0
074 G000000        0
074 H000000        0
074 I000000     4300
074 J000000      445
074 K000000        0
074 L000000     5690
      PAGE  8
074 M000000      383
074 N000000   415207
074 O000000     5953
074 P000000      162
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000     2467
074 S000000   146682
074 T000000   259943
074 U010000    16707
074 U020000        0
074 V010000    15.56
074 V020000     0.00
074 W000000   0.0000
074 X000000      302
074 Y000000        0
075 A000000        0
075 B000000   262142
076  000000    18.98
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 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      0
086 B020000      0
086 C010000      0
086 C020000      0
      PAGE  9
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
087 A010000 COMMON
087 A020000 09247D105
087 A030000 BKN
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE   DONALD C. BURKE
TITLE       TREASURER