PAGE 1 000 A000000 02/28/2011 000 C000000 0000835948 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 MUNIVEST FUND, INC. 001 B000000 811-05611 001 C000000 8004417762 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, LLC 008 B000001 A 008 C000001 801-47710 008 D010001 WILMINGTON 008 D020001 DE 008 D030001 19809 008 A000002 BLACKROCK INVESTMENT MANAGEMENT, LLC 008 B000002 S 008 C000002 801-56972 008 D010002 PLAINSBORO 008 D020002 NJ 008 D030002 08536 012 A000001 BNY MELLON SHAREOWNER SERVICES (COMMON) 012 B000001 85-05006 012 C010001 JERSEY CITY 012 C020001 NJ 012 C030001 07310 012 A000002 THE BANK OF NEW YORK MELLON (PREFERRED) 012 B000002 85-05006 PAGE 2 012 C010002 NEW YORK 012 C020002 NY 012 C030002 10286 013 A000001 DELOITTE & TOUCHE LLP 013 B010001 PRINCETON 013 B020001 NJ 013 B030001 08540 014 A000001 BLACKROCK CAPITAL MARKETS, LLC 014 B000001 8-67827 014 A000002 BLACKROCK EXECUTION SERVICES 014 B000002 8-48719 014 A000003 BLACKROCK FUND DISTRIBUTION COMPANY 014 B000003 8-67795 014 A000004 BLACKROCK INVESTMENTS, LLC 014 B000004 8-48436 014 A000005 HARRIS WILLIAMS LLC 014 B000005 8-53380 014 A000006 PNC CAPITAL MARKETS, INC. 014 B000006 8-32493 014 A000007 PNC INVESTMENTS LLC 014 B000007 8-66195 015 A000001 THE BANK OF NEW YORK MELLON 015 B000001 C 015 C010001 NEW YORK 015 C020001 NY 015 C030001 10286 015 E010001 X 015 A000002 J.P. MORGAN CHASE BANK 015 B000002 S 015 C010002 NEW YORK 015 C020002 NY 015 C030002 10017 015 E010002 X 018 000000 Y 019 A000000 Y 019 B000000 294 019 C000000 BLKRKADVSR 020 A000001 UBS SECURITIES LLC 020 B000001 13-3873456 020 C000001 1 020 A000002 JANNEY MONTGOMERY SCOTT LLC 020 B000002 23-0731260 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 PAGE 3 021 000000 1 022 A000001 FFI INSTITUTIONAL TAX-EXEMPT FUND 022 B000001 22-2509978 022 C000001 75892 022 D000001 71612 022 A000002 CITIGROUP GLOBAL MARKETS, INC. 022 B000002 11-2418191 022 C000002 16379 022 D000002 28634 022 A000003 J.P. MORGAN SECURITIES INC. 022 B000003 13-3299429 022 C000003 21965 022 D000003 7282 022 A000004 BARCLAYS CAPITAL INC. 022 C000004 15412 022 D000004 1391 022 A000005 GOLDMAN, SACHS & CO. 022 B000005 13-5108880 022 C000005 3533 022 D000005 6649 022 A000006 WELLS FARGO ADVISORS, LLC 022 B000006 54-0796506 022 C000006 3092 022 D000006 5262 022 A000007 MORGAN STANLEY & CO. INCORPORATED 022 B000007 13-2655998 022 C000007 5825 022 D000007 0 022 A000008 MERCHANTS BANK, NA 022 C000008 0 022 D000008 5770 022 A000009 JEFFERIES & COMPANY, INC. 022 B000009 95-2622990 022 C000009 4321 022 D000009 565 022 A000010 MERRILL LYNCH, PIERCE, FENNER & SMITH INC. 022 B000010 13-5674085 022 C000010 4824 022 D000010 0 023 C000000 161593 023 D000000 146101 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 PAGE 4 027 000000 N 045 000000 Y 046 000000 N 047 000000 Y 048 000000 0.500 048 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 N 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 N 054 M000000 Y 054 N000000 N 055 A000000 N 055 B000000 N 056 000000 Y PAGE 5 057 000000 N 058 A000000 N 059 000000 Y 060 A000000 N 060 B000000 N 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 0.0 062 O000000 170.0 062 P000000 0.0 062 Q000000 0.0 062 R000000 0.0 063 A000000 0 063 B000000 20.0 064 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 PAGE 6 070 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 N 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 77364 071 B000000 91257 071 C000000 991491 071 D000000 8 072 A000000 6 072 B000000 26876 072 C000000 0 072 D000000 0 072 E000000 15 072 F000000 2503 072 G000000 52 072 H000000 0 072 I000000 43 072 J000000 20 072 K000000 0 072 L000000 20 072 M000000 33 072 N000000 12 072 O000000 0 072 P000000 730 072 Q000000 0 072 R000000 21 072 S000000 95 072 T000000 0 072 U000000 0 072 V000000 0 072 W000000 234 072 X000000 3763 072 Y000000 3 072 Z000000 23131 072AA000000 0 072BB000000 5594 072CC010000 0 PAGE 7 072CC020000 65656 072DD010000 21804 072DD020000 0 072EE000000 11 073 A010000 0.3480 073 A020000 0.0000 073 B000000 0.0002 073 C000000 0.0000 074 A000000 580 074 B000000 0 074 C000000 0 074 D000000 948488 074 E000000 0 074 F000000 0 074 G000000 0 074 H000000 0 074 I000000 8774 074 J000000 16173 074 K000000 0 074 L000000 13356 074 M000000 142 074 N000000 987513 074 O000000 7933 074 P000000 378 074 Q000000 0 074 R010000 0 074 R020000 0 074 R030000 0 074 R040000 177498 074 S000000 243847 074 T000000 557857 074 U010000 62796 074 U020000 0 074 V010000 8.88 074 V020000 0.00 074 W000000 0.0000 074 X000000 20877 074 Y000000 268589 075 A000000 0 075 B000000 829538 076 000000 9.04 077 A000000 Y 077 O000000 Y 078 000000 N 086 A010000 333 086 A020000 3164 086 B010000 0 086 B020000 0 086 C010000 0 086 C020000 0 086 D010000 0 PAGE 8 086 D020000 0 086 E010000 0 086 E020000 0 086 F010000 0 086 F020000 0 087 A010000 COMMON STOCK 087 A020000 09253R105 087 A030000 MVF 087 B010000 PREFERRED STOCK 088 A000000 N 088 B000000 N 088 C000000 N 088 D000000 Y SIGNATURE NEAL J. ANDREWS TITLE CFO