PAGE 1
000 B000000 08/31/2006
000 C000000 0001167467
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 MUNICIPAL BOND TRUST
001 B000000 811-21036
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, 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 COMPUTERSHARE TRUST COMPANY, NA
012 B000001 85-11340
012 C010001 CANTON
012 C020001 MA
012 C030001 02021
013 A000001 DELOITTE & 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.
PAGE 2
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.
014 B000007 8-052396
014 A000008 BLACKROCK DISTRIBUTORS, INC.
014 B000008 8-048775
014 A000009 PERSIMMON SECURITIES
014 B000009 8-053071
014 A000010 PNC INVESTMENTS LLC
014 B000010 8-066195
014 A000011 STATE STREET RESEARCH INVESTMENTS
014 B000011 8-035442
015 A000001 STATESTREET BANK AND TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02110
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 56
019 C000000 BLACKROCKF
020 A000001 MERRILL LYNCH
020 B000001 13-5674085
020 C000001 6
021 000000 6
022 A000001 STATE STREET BANK
022 B000001 04-1867445
022 C000001 111250
022 D000001 110250
022 A000002 MORGAN STANLEY
022 B000002 13-2655998
022 C000002 43630
022 D000002 60700
022 A000003 CITIGROUP
022 B000003 11-2418191
022 C000003 48779
022 D000003 44801
022 A000004 CHASE SECURITIES, INC.
022 B000004 13-3379014
022 C000004 28766
PAGE 3
022 D000004 15547
022 A000005 GOLDMAN SACHS & CO.
022 B000005 13-5108880
022 C000005 32980
022 D000005 8800
022 A000006 UBS FINANCIAL SERVICES, INC.
022 B000006 13-2638166
022 C000006 11221
022 D000006 16865
022 A000007 MERRILL LYNCH
022 B000007 13-5674085
022 C000007 14017
022 D000007 5042
022 A000008 WACHOVIA BANK N.A.
022 B000008 34-1542819
022 C000008 11402
022 D000008 7445
022 A000009 BANC OF AMERICA
022 B000009 56-2058405
022 C000009 6899
022 D000009 11257
022 A000010 RAYMOND JAMES
022 B000010 59-1237041
022 C000010 5975
022 D000010 8507
023 C000000 338433
023 D000000 335582
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
PAGE 4
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
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
PAGE 5
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
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 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 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
PAGE 6
062 J000000 0.0
062 K000000 0.0
062 L000000 0.8
062 M000000 0.0
062 N000000 0.0
062 O000000 153.5
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
063 A000000 0
063 B000000 26.6
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 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
PAGE 7
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000 214224
071 B000000 212373
071 C000000 249257
071 D000000 85
072 A000000 12
072 B000000 13816
072 C000000 0
072 D000000 0
072 E000000 2
072 F000000 1652
072 G000000 0
072 H000000 0
072 I000000 17
072 J000000 56
072 K000000 0
072 L000000 29
072 M000000 20
072 N000000 20
072 O000000 45
072 P000000 9
072 Q000000 0
072 R000000 39
072 S000000 34
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 301
072 X000000 2222
072 Y000000 808
072 Z000000 12404
072AA000000 3892
072BB000000 0
072CC010000 0
072CC020000 2036
072DD010000 10543
072DD020000 0
072EE000000 926
073 A010000 1.0365
073 A020000 0.0000
073 B000000 0.9087
073 C000000 0.0000
074 A000000 550
074 B000000 0
074 C000000 256264
074 D000000 0
074 E000000 0
074 F000000 0
074 G000000 0
PAGE 8
074 H000000 0
074 I000000 1400
074 J000000 218
074 K000000 0
074 L000000 2779
074 M000000 37
074 N000000 261248
074 O000000 2286
074 P000000 97
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 1432
074 S000000 90538
074 T000000 166895
074 U010000 10205
074 U020000 0
074 V010000 16.35
074 V020000 0.00
074 W000000 0.0000
074 X000000 72
074 Y000000 0
075 A000000 0
075 B000000 163727
076 000000 17.89
077 A000000 Y
077 B000000 Y
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 N
077 P000000 N
077 Q010000 Y
077 Q020000 N
077 Q030000 N
078 000000 N
080 A000000 Vigilant Insurance Company
080 B000000 Gulf Insurance Group
080 C000000 33000
081 A000000 Y
081 B000000 57
PAGE 9
082 A000000 Y
082 B000000 10
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 Y
085 B000000 N
086 A010000 64
086 A020000 1046
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 COMMON
087 A020000 09249H104
087 A030000 BBK
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE HENRY GABBAY
TITLE TREASURER