PAGE 1 000 B000000 10/31/2012 000 C000000 0001528988 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 UTILITY & INFRASTRUCTURE TRUST 001 B000000 811-22606 001 C000000 8884417762 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 008 A000002 BLACKROCK FINANCIAL MANAGEMENT, INC. 008 B000002 S 008 C000002 801-48433 008 D010002 NEW YORK 008 D020002 NY 008 D030002 10055 008 A000003 BLACKROCK INVESTMENT MANAGEMENT, LLC 008 B000003 A 008 C000003 801-56972 008 D010003 PRINCETON 008 D020003 NJ 008 D030003 08540 012 A000001 BNY MELLON SHAREOWNER SERVICES 012 B000001 85-0000000 012 C010001 JERSEY CITY 012 C020001 NJ 012 C030001 07310 013 A000001 DELOITTE & TOUCHE LLP 013 B010001 PHILADELPHIA 013 B020001 PA 013 B030001 19103 014 A000001 BLACKROCK CAPITAL MARKETS, LLC PAGE 2 014 B000001 8-67827 014 A000002 BLACKROCK EXECUTION SERVICES 014 B000002 8-48719 014 A000003 BLACKROCK INVESTMENTS, LLC 014 B000003 8-48436 014 A000004 HARRIS WILLIAMS LLC 014 B000004 8-53380 014 A000005 PNC CAPITAL MARKETS, INC. 014 B000005 8-32493 014 A000006 PNC INVESTMENTS, LLC 014 B000006 8-66195 015 A000001 THE BANK OF NEW YORK MELLON CORP. 015 B000001 C 015 C010001 NEW YORK 015 C020001 NY 015 C030001 10286 015 E010001 X 018 000000 Y 019 A000000 Y 019 B000000 288 019 C000000 BLKRKADVSR 020 A000001 MORGAN STANLEY 020 B000001 13-2655998 020 C000001 76 020 A000002 UBS SECURITIES 020 B000002 13-2932996 020 C000002 53 020 A000003 CREDIT SUISSE FIRST BOSTON 020 B000003 13-1898818 020 C000003 47 020 A000004 DEUTSCHE BANK SECURITIES INC. 020 B000004 13-2730828 020 C000004 40 020 A000005 CITIGROUP GLOBAL MARKETS, INC. 020 B000005 11-2418191 020 C000005 34 020 A000006 JP MORGAN CHASE & CO. 020 B000006 13-3379014 020 C000006 34 020 A000007 BARCLAYS CAPITAL INC. 020 B000007 13-3297824 020 C000007 27 020 A000008 GOLDMAN SACHS GROUP, INC. 020 B000008 13-5108880 020 C000008 27 020 A000009 RBC CAPITAL MARKETS CORP. 020 B000009 13-5033225 020 C000009 26 020 A000010 BANK OF AMERICA SECURITIES LLC 020 B000010 56-2058405 020 C000010 25 PAGE 3 021 000000 466 022 A000001 CREDIT SUISSE SECURITIES 022 B000001 13-1898818 022 C000001 95327 022 D000001 5792 022 A000002 UBS SECURITIES LLC 022 B000002 13-3873456 022 C000002 27269 022 D000002 71379 022 A000003 BARCLAYS CAPITAL, INC. 022 B000003 06-1031656 022 C000003 84691 022 D000003 18 022 A000004 RBC DOMINION SECURITIES, INC. 022 C000004 79981 022 D000004 122 022 A000005 MORGAN STANLEY & CO., INC. 022 B000005 13-2655998 022 C000005 73923 022 D000005 2793 022 A000006 DEUTSCHE BANK SECURITIES, INC. 022 B000006 13-2730828 022 C000006 35206 022 D000006 1760 022 A000007 CITIGROUP GLOBAL MARKETS INC. 022 B000007 11-2418191 022 C000007 33406 022 D000007 2507 022 A000008 JP MORGAN CHASE & CO. 022 B000008 13-3379014 022 C000008 25789 022 D000008 5541 022 A000009 BANK OF AMERICA SECURITIES LLC 022 B000009 56-2058405 022 C000009 22019 022 D000009 7538 022 A000010 GOLDMAN SACHS GROUP, INC. 022 B000010 13-5108880 022 C000010 27604 022 D000010 1828 023 C000000 570553 023 D000000 109208 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 PAGE 4 026 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 0 042 F000000 0 042 G000000 0 042 H000000 0 043 000000 0 044 000000 0 PAGE 5 045 000000 Y 046 000000 N 047 000000 Y 048 000000 1.000 048 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 054 A000000 Y 054 B000000 Y 054 C000000 Y 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 Y 054 M000000 N 054 N000000 N 054 O000000 Y 055 A000000 N 055 B000000 N 056 000000 Y PAGE 6 057 000000 N 058 A000000 N 059 000000 Y 060 A000000 N 060 B000000 N 061 000000 0 062 A000000 N 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 0.0 062 P000000 0.0 062 Q000000 0.0 062 R000000 0.0 063 A000000 0 063 B000000 0.0 066 A000000 Y 066 B000000 N 066 C000000 N 066 D000000 N 066 E000000 Y 066 F000000 N 066 G000000 N 067 000000 N 068 A000000 N 068 B000000 N 069 000000 N 070 A010000 Y 070 A020000 N 070 B010000 Y 070 B020000 Y 070 C010000 Y 070 C020000 N 070 D010000 Y 070 D020000 N 070 E010000 Y 070 E020000 N 070 F010000 Y 070 F020000 N 070 G010000 Y 070 G020000 N PAGE 7 070 H010000 Y 070 H020000 N 070 I010000 N 070 I020000 N 070 J010000 Y 070 J020000 N 070 K010000 Y 070 K020000 Y 070 L010000 Y 070 L020000 Y 070 M010000 Y 070 M020000 Y 070 N010000 Y 070 N020000 N 070 O010000 Y 070 O020000 N 070 P010000 Y 070 P020000 Y 070 Q010000 N 070 Q020000 N 070 R010000 N 070 R020000 N 071 A000000 573806 071 B000000 259689 071 C000000 289917 071 D000000 90 072 A000000 12 072 B000000 0 072 C000000 12441 072 D000000 0 072 E000000 0 072 F000000 3063 072 G000000 0 072 H000000 0 072 I000000 32 072 J000000 100 072 K000000 0 072 L000000 34 072 M000000 37 072 N000000 11 072 O000000 26 072 P000000 0 072 Q000000 0 072 R000000 65 072 S000000 61 072 T000000 0 072 U000000 33 072 V000000 0 072 W000000 8 072 X000000 3470 072 Y000000 22 PAGE 8 072 Z000000 8993 072AA000000 11409 072BB000000 9247 072CC010000 26891 072CC020000 0 072DD010000 11418 072DD020000 0 072EE000000 6968 073 A010000 0.4900 073 A020000 0.0000 073 B000000 0.4100 073 C000000 0.1900 074 A000000 52 074 B000000 0 074 C000000 0 074 D000000 0 074 E000000 0 074 F000000 336770 074 G000000 0 074 H000000 0 074 I000000 7230 074 J000000 27 074 K000000 2 074 L000000 1115 074 M000000 0 074 N000000 345196 074 O000000 46 074 P000000 292 074 Q000000 0 074 R010000 0 074 R020000 0 074 R030000 2753 074 R040000 166 074 S000000 0 074 T000000 341939 074 U010000 16907 074 U020000 0 074 V010000 20.22 074 V020000 0.00 074 W000000 0.0000 074 X000000 17145 074 Y000000 2599 075 A000000 0 075 B000000 327468 076 000000 19.03 077 A000000 Y 077 B000000 Y 077 C000000 N 077 D000000 N 077 E000000 N 077 F000000 N PAGE 9 077 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 N 077 Q020000 N 077 Q030000 N 078 000000 N 080 A000000 Federal Insurance Company 080 B000000 National Union Fire Insurance Company 080 C000000 69325 081 A000000 Y 081 B000000 92 082 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 16907 086 A020000 322280 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 09248D104 087 A030000 BUI 088 A000000 N 088 B000000 N 088 C000000 N 088 D000000 N SIGNATURE BOB MAURER TITLE MANAGER