PAGE 1 000 B000000 10/31/2007 000 C000000 0000891038 000 D000000 N 000 E000000 NF 000 F000000 Y 000 G000000 N 000 H000000 N 000 I000000 6.1 000 J000000 A 001 A000000 BLK MUNIYIELD PENNSYLVANIA INSURED FUND 001 B000000 811-07136 001 C000000 8004417762 002 A000000 P.O. BOX 9011 002 B000000 PRINCETON 002 C000000 NJ 002 D010000 08543 002 D020000 9011 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 011 A000001 MERRILL LYNCH, PIERCE, FENNER & SMITH INC. 011 B000001 8-7221 011 C010001 NEW YORK 011 C020001 NY 011 C030001 10281 011 C040001 1201 PAGE 2 012 A000001 COMPUTERSHARE TRUST COMPANY, N.A. (COMMON) 012 B000001 85-11340 012 C010001 PROVIDENCE 012 C020001 RI 012 C030001 02940 012 C040001 3010 012 A000002 THE BANK OF NEW YORK MELLON (PREFERRED) 012 B000002 85-05006 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 MLPF&S AND OTHER ML BROKER/DEALER AFFILIATES 014 B000001 8-7221 014 A000002 BLACKROCK INVESTMENTS, INC. 014 B000002 8-048436 014 A000003 NORTHERN FUNDS DISTRIBUTORS, LLC 014 B000003 8-051242 014 A000004 PNC CAPITAL MARKETS, LLC 014 B000004 8-032493 014 A000005 J.J.B. HILLIARD W.L. LYONS, INC. 014 B000005 8-033133 014 A000006 PFPC DISTRIBUTORS, INC. 014 B000006 8-045467 014 A000007 MGI FUNDS DISTRIBUTORS, INC. 014 B000007 8-046960 014 A000008 ABN AMRO DISTRIBUTION SERVICES, INC. 014 B000008 8-052396 014 A000009 BLACKROCK DISTRIBUTORS, INC. 014 B000009 8-048775 014 A000010 PERSIMMON SECURITIES, INC. 014 B000010 8-053071 014 A000011 PNC INVESTMENTS LLC 014 B000011 8-066195 014 A000012 STATE STREET RESEARCH INVEST SERV, INC. 014 B000012 8-035442 015 A000001 STATE STREET BANK AND TRUST COMPANY 015 B000001 C 015 C010001 BOSTON 015 C020001 MA 015 C030001 02101 015 E010001 X 015 A000002 THE BANK OF NEW YORK MELLON 015 B000002 S 015 C010002 NEW YORK 015 C020002 NY 015 C030002 10286 015 E010002 X PAGE 3 015 A000003 BANKERS TRUST COMPANY 015 B000003 S 015 C010003 NEW YORK 015 C020003 NY 015 C030003 10006 015 E010003 X 015 A000004 J.P. MORGAN CHASE BANK 015 B000004 S 015 C010004 NEW YORK 015 C020004 NY 015 C030004 10017 015 E010004 X 015 A000005 CUSTODIAL TRUST CO. 015 B000005 S 015 C010005 NEW YORK 015 C020005 NY 015 C030005 10167 015 E010005 X 015 A000006 MORGAN GUARANTY TRUST CO. OF NEW YORK 015 B000006 S 015 C010006 NEW YORK 015 C020006 NY 015 C030006 10260 015 E010006 X 018 000000 Y 019 A000000 Y 019 B000000 169 019 C000000 BLACKROCKC 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 J.P. MORGAN SECURITIES INC. 022 B000001 13-3224016 022 C000001 59749 022 D000001 54845 022 A000002 WACHOVIA SECURITIES, LLC 022 B000002 54-0796506 022 C000002 30685 022 D000002 33506 022 A000003 CMA PA MUNICIPAL MONEY FUND 022 B000003 22-6507573 022 C000003 20423 022 D000003 20400 PAGE 4 022 A000004 CITIGROUP GLOBAL MARKETS, INC. 022 B000004 11-2418191 022 C000004 17008 022 D000004 14716 022 A000005 UBS SECURITIES LLC 022 B000005 13-3873456 022 C000005 16648 022 D000005 8677 022 A000006 RBC DAIN RAUSCHER INC. 022 B000006 41-0212020 022 C000006 18369 022 D000006 4460 022 A000007 BEAR, STEARNS & CO. INC. 022 B000007 13-3299429 022 C000007 11387 022 D000007 11329 022 A000008 MORGAN STANLEY & CO. INCORPORATED 022 B000008 13-2655998 022 C000008 1196 022 D000008 12356 022 A000009 LEHMAN BROTHERS INC. 022 B000009 13-2518466 022 C000009 5000 022 D000009 7745 022 A000010 SAMUEL A. RAMIREZ & CO., INC. 022 B000010 13-2695511 022 C000010 2665 022 D000010 7099 023 C000000 208220 023 D000000 198935 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 026 H000000 N 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 PAGE 5 048 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 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 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 4.7 062 F000000 0.0 062 G000000 0.0 PAGE 6 062 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 168.0 062 P000000 0.0 062 Q000000 0.0 062 R000000 0.0 063 A000000 0 063 B000000 20.3 064 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 N 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 N 070 P010000 Y PAGE 7 070 P020000 N 070 Q010000 N 070 Q020000 N 070 R010000 N 070 R020000 N 071 A000000 108778 071 B000000 110105 071 C000000 312274 071 D000000 35 072 A000000 12 072 B000000 14693 072 C000000 20 072 D000000 0 072 E000000 0 072 F000000 1412 072 G000000 96 072 H000000 0 072 I000000 56 072 J000000 19 072 K000000 0 072 L000000 29 072 M000000 22 072 N000000 0 072 O000000 0 072 P000000 1055 072 Q000000 0 072 R000000 62 072 S000000 18 072 T000000 0 072 U000000 0 072 V000000 0 072 W000000 331 072 X000000 3100 072 Y000000 3 072 Z000000 11616 072AA000000 5672 072BB000000 3335 072CC010000 0 072CC020000 6999 072DD010000 7910 072DD020000 0 072EE000000 0 073 A010000 0.6890 073 A020000 0.0000 073 B000000 0.0000 073 C000000 0.0000 074 A000000 0 074 B000000 0 074 C000000 8350 074 D000000 298678 074 E000000 0 PAGE 8 074 F000000 0 074 G000000 0 074 H000000 0 074 I000000 86 074 J000000 0 074 K000000 0 074 L000000 4352 074 M000000 64 074 N000000 311530 074 O000000 2586 074 P000000 121 074 Q000000 0 074 R010000 0 074 R020000 0 074 R030000 0 074 R040000 28998 074 S000000 102018 074 T000000 177807 074 U010000 11481 074 U020000 0 074 V010000 15.49 074 V020000 0.00 074 W000000 0.0000 074 X000000 5567 074 Y000000 633 075 A000000 0 075 B000000 282456 076 000000 13.67 077 A000000 Y 077 B000000 Y 077 O000000 Y 078 000000 N 080 A000000 ICI MUTUAL INSURANCE CO. 080 C000000 750 081 A000000 Y 081 B000000 125 082 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 0 086 A020000 0 086 B010000 0 086 B020000 0 086 C010000 0 086 C020000 0 086 D010000 0 PAGE 9 086 D020000 0 086 E010000 0 086 E020000 0 086 F010000 0 086 F020000 0 087 A010000 COMMON STOCK 087 A020000 09255G107 087 A030000 MPA 087 B010000 PREFERRED STOCK 088 A000000 N 088 B000000 N 088 C000000 N 088 D000000 Y SIGNATURE DONALD C. BURKE TITLE TREASURER