MFS MUNICIPAL SERIES TRUST
NSAR-B, 1998-05-29
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<PAGE>      PAGE  1
000 B000000 03/31/98
000 C000000 0000751656
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 MFS MUNICIPAL SERIES TRUST
001 B000000 811-4096
001 C000000 6179545000
002 A000000 500 BOYLSTON STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02116
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000 16
007 C010100  1
007 C020100 MFS MARYLAND MUNICIPAL BOND FUND
007 C030100 N
007 C010200  2
007 C020200 MFS NORTH CAROLINA MUNICIPAL BOND FUND
007 C030200 N
007 C010300  3
007 C020300 MFS SOUTH CAROLINA MUNICIPAL BOND FUND
007 C030300 N
007 C010400  4
007 C020400 MFS VIRGINIA MUNICIPAL BOND FUND
007 C030400 N
007 C010500  5
007 C020500 MFS WEST VIRGINIA MUNICIPAL BOND FUND
007 C030500 N
007 C010600  6
007 C020600 MFS MASSACHUSETTS MUNICIPAL BOND FUND
007 C030600 N
007 C010700  7
007 C020700 MFS GEORGIA MUNICIPAL BOND FUND
007 C030700 N
007 C010800  8
007 C010900  9
007 C011000 10
007 C011100 11
007 C021100 MFS NEW YORK MUNICIPAL BOND FUND
007 C031100 N
007 C011200 12
007 C011300 13
<PAGE>      PAGE  2
007 C021300 MFS TENNESEE MUNICIPAL BOND FUND
007 C031300 N
007 C011400 14
007 C021400 MFS ALABAMA MUNICIPAL BOND FUND
007 C031400 N
007 C011500 15
007 C021500 MFS ARKANSAS MUNICIPAL BOND FUND
007 C031500 N
007 C011600 16
007 C011700 17
007 C021700 MFS FLORIDA MUNICIPAL BOND FUND
007 C031700 N
007 C011800 18
007 C021800 MFS MISSISSIPPI MUNICIPAL BOND FUND
007 C031800 N
007 C011900 19
007 C012000 20
007 C012100 21
007 C022100 MFS PENNSYLVANIA MUNICIPAL BOND FUND
007 C032100 N
007 C012200 22
007 C022200 MFS CALIFORNIA MUNICIPAL BOND FUND
007 C032200 N
007 C012300 23
007 C022300 MFS MUNICIPAL INCOME FUND
007 C032300 N
007 C012400 24
007 C012500 25
007 C012600 26
007 C012700 27
007 C012800 28
007 C012900 29
007 C013000 30
007 C013100 31
007 C013200 32
007 C013300 33
007 C013400 34
007 C013500 35
007 C013600 36
007 C013700 37
007 C013800 38
007 C013900 39
007 C014000 40
008 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B00AA01 A
008 C00AA01 801-17352
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02116
010 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
010 B00AA01 801-17352
<PAGE>      PAGE  3
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 02116
011 A00AA01 MFS FUND DISTRIBUTORS, INC.
011 B00AA01 8-27864
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02116
012 A00AA01 MFS SERVICE CENTER, INC.
012 B00AA01 84-1316
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02116
013 A00AA01 DELOITTE & TOUCHE LLP
013 B01AA01 BOSTON
013 B02AA01 MA
013 B03AA01 02110
015 A00AA01 STATE STREET BANK & TRUST COMPANY
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02110
015 E01AA01 X
015 A00AA02 THE BANK OF NEW YORK
015 B00AA02 S
015 C01AA02 NEW YORK
015 C02AA02 NY
015 C03AA02 10286
015 E01AA02 X
015 A00AA03 CHEMICAL BANK
015 B00AA03 S
015 C01AA03 NEW YORK
015 C02AA03 NY
015 C03AA03 10041
015 E01AA03 X
015 A00AA04 MORGAN GUARANTY TRUST COMPANY
015 B00AA04 S
015 C01AA04 NEW YORK
015 C02AA04 NY
015 C03AA04 10015
015 E01AA04 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   55
019 C00AA00 MASSFINSER
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<PAGE>      PAGE  4
020 C000007      0
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022 C000002    250921
022 D000002    189198
022 A000003 MORGAN (J.P.) SECURITIES
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022 C000003    176418
022 D000003    170779
022 A000004 EQUITY SECURITY SYSTEMS
022 B000004 00-0000000
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022 D000004     69699
022 A000005 CRAIGIE INCORPORATED
022 B000005 54-0294670
022 C000005     49295
022 D000005     62103
022 A000006 PNC SECURITIES
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022 A000007 CITIBANK SECURITIES
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022 A000008 LEHMAN BROTHERS
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022 A000009 MERRILL LYNCH
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022 A000010 BEAR, STEARNS SECURITIES
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<PAGE>      PAGE  5
025 D00AA04       0
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<PAGE>      PAGE  6
083 B00AA00        0
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<PAGE>      PAGE  7
031 B000100      0
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048 I020100 0.000
048 J010100        0
048 J020100 0.000
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048 K020100 0.000
049  000100 N
050  000100 N
051  000100 N
052  000100 N
053 A000100 Y
053 B000100 Y
053 C000100 Y
055 A000100 N
<PAGE>      PAGE  8
055 B000100 N
056  000100 Y
057  000100 N
058 A000100 N
059  000100 Y
060 A000100 N
060 B000100 N
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062 I000100   0.0
062 J000100   0.0
062 K000100   0.0
062 L000100   0.0
062 M000100   0.0
062 N000100   0.0
062 O000100  94.8
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063 B000100 15.9
064 A000100 Y
064 B000100 N
070 A010100 Y
070 A020100 N
070 B010100 N
070 B020100 N
070 C010100 Y
070 C020100 N
070 D010100 N
070 D020100 N
070 E010100 Y
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 Y
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 N
<PAGE>      PAGE  9
070 K020100 N
070 L010100 N
070 L020100 N
070 M010100 N
070 M020100 N
070 N010100 N
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 N
070 R020100 N
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<PAGE>      PAGE  10
072EE000100        0
073 A010100   0.5400
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074 B000100        0
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074 D000100   139893
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074 G000100        0
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074 M000100        1
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028 D010200     10132
<PAGE>      PAGE  11
028 D020200       983
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028 E010200      9852
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028 F040200     11246
028 G010200     37879
028 G020200      5913
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032  000200    483
033  000200      0
034  000200 Y
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036 A000200 N
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042 A000200   0
042 B000200   0
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042 D000200  62
042 E000200   0
042 F000200   0
042 G000200   0
042 H000200   0
043  000200   1824
044  000200      0
045  000200 Y
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047  000200 Y
048  000200  0.550
048 A010200        0
048 A020200 0.000
048 B010200        0
048 B020200 0.000
048 C010200        0
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<PAGE>      PAGE  12
048 E020200 0.000
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048 F020200 0.000
048 G010200        0
048 G020200 0.000
048 H010200        0
048 H020200 0.000
048 I010200        0
048 I020200 0.000
048 J010200        0
048 J020200 0.000
048 K010200        0
048 K020200 0.000
049  000200 N
050  000200 N
051  000200 N
052  000200 N
053 A000200 Y
053 B000200 Y
053 C000200 Y
055 A000200 N
055 B000200 N
056  000200 Y
057  000200 N
058 A000200 N
059  000200 Y
060 A000200 N
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062 E000200   0.9
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062 H000200   0.0
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062 L000200   0.0
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062 O000200  98.8
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062 Q000200   0.0
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063 A000200   0
063 B000200 18.1
064 A000200 Y
064 B000200 N
<PAGE>      PAGE  13
070 A010200 Y
070 A020200 N
070 B010200 N
070 B020200 N
070 C010200 Y
070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 Y
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 Y
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 N
070 K010200 N
070 K020200 N
070 L010200 N
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 N
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070 Q020200 N
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
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050  000300 N
051  000300 N
052  000300 N
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055 A000300 N
055 B000300 N
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<PAGE>      PAGE  17
062 B000300   0.0
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<PAGE>      PAGE  18
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<PAGE>      PAGE  19
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<PAGE>      PAGE  20
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<PAGE>      PAGE  21
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056  000400 Y
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<PAGE>      PAGE  22
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070 M020400 N
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<PAGE>      PAGE  23
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<PAGE>      PAGE  24
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<PAGE>      PAGE  25
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<PAGE>      PAGE  26
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<PAGE>      PAGE  27
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<PAGE>      PAGE  28
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<PAGE>      PAGE  29
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<PAGE>      PAGE  30
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<PAGE>      PAGE  31
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<PAGE>      PAGE  32
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<PAGE>      PAGE  33
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<PAGE>      PAGE  34
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<PAGE>      PAGE  35
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<PAGE>      PAGE  36
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<PAGE>      PAGE  37
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028 G011100     14990
028 G021100      2032
028 G031100         0
028 G041100     19803
028 H001100     13504
029  001100 Y
030 A001100    140
030 B001100  4.75
030 C001100  0.00
031 A001100     14
031 B001100      0
032  001100    126
033  001100      0
034  001100 Y
035  001100     69
036 A001100 N
<PAGE>      PAGE  38
036 B001100      0
042 A001100   0
042 B001100   0
042 C001100  35
042 D001100  65
042 E001100   0
042 F001100   0
042 G001100   0
042 H001100   0
043  001100    568
044  001100      0
045  001100 Y
046  001100 N
047  001100 Y
048  001100  0.550
048 A011100        0
048 A021100 0.000
048 B011100        0
048 B021100 0.000
048 C011100        0
048 C021100 0.000
048 D011100        0
048 D021100 0.000
048 E011100        0
048 E021100 0.000
048 F011100        0
048 F021100 0.000
048 G011100        0
048 G021100 0.000
048 H011100        0
048 H021100 0.000
048 I011100        0
048 I021100 0.000
048 J011100        0
048 J021100 0.000
048 K011100        0
048 K021100 0.000
049  001100 N
050  001100 N
051  001100 N
052  001100 N
053 A001100 Y
053 B001100 Y
053 C001100 Y
055 A001100 Y
055 B001100 N
056  001100 Y
057  001100 N
058 A001100 N
059  001100 Y
060 A001100 N
<PAGE>      PAGE  39
060 B001100 N
061  001100     1000
062 A001100 Y
062 B001100   0.0
062 C001100   0.0
062 D001100   0.0
062 E001100   0.4
062 F001100   0.0
062 G001100   0.0
062 H001100   0.0
062 I001100   0.0
062 J001100   0.0
062 K001100   0.0
062 L001100   0.0
062 M001100   0.0
062 N001100   0.0
062 O001100  98.2
062 P001100   0.0
062 Q001100   0.0
062 R001100   0.0
063 A001100   0
063 B001100 15.4
064 A001100 Y
064 B001100 N
070 A011100 Y
070 A021100 N
070 B011100 N
070 B021100 N
070 C011100 Y
070 C021100 N
070 D011100 N
070 D021100 N
070 E011100 Y
070 E021100 N
070 F011100 N
070 F021100 N
070 G011100 Y
070 G021100 N
070 H011100 N
070 H021100 N
070 I011100 N
070 I021100 N
070 J011100 Y
070 J021100 N
070 K011100 N
070 K021100 N
070 L011100 N
070 L021100 N
070 M011100 N
070 M021100 N
070 N011100 N
<PAGE>      PAGE  40
070 N021100 N
070 O011100 Y
070 O021100 N
070 P011100 Y
070 P021100 N
070 Q011100 N
070 Q021100 N
070 R011100 N
070 R021100 N
071 A001100     59571
071 B001100     69903
071 C001100    144728
071 D001100   41
072 A001100 12
072 B001100     9083
072 C001100        0
072 D001100        0
072 E001100        0
072 F001100      807
072 G001100       21
072 H001100        0
072 I001100      185
072 J001100       58
072 K001100       10
072 L001100       15
072 M001100       18
072 N001100        0
072 O001100        0
072 P001100        0
072 Q001100        0
072 R001100       31
072 S001100        9
072 T001100      566
072 U001100        0
072 V001100        0
072 W001100       98
072 X001100     1818
072 Y001100      117
072 Z001100     7382
072AA001100      557
072BB001100        0
072CC011100     8128
072CC021100        0
072DD011100     5984
072DD021100     1120
072EE001100        0
073 A011100   0.5500
073 A021100   0.4600
073 B001100   0.0000
073 C001100   0.0000
074 A001100       52
<PAGE>      PAGE  41
074 B001100        0
074 C001100      600
074 D001100   143322
074 E001100        0
074 F001100        0
074 G001100        0
074 H001100        0
074 I001100        0
074 J001100     1047
074 K001100        0
074 L001100     2735
074 M001100        1
074 N001100   147757
074 O001100     1273
074 P001100       11
074 Q001100        0
074 R011100        0
074 R021100        0
074 R031100        0
074 R041100      479
074 S001100        0
074 T001100   145994
074 U011100    10603
074 U021100     2365
074 V011100    11.26
074 V021100    11.26
074 W001100   0.0000
074 X001100     3441
074 Y001100        0
075 A001100        0
075 B001100   147411
076  001100     0.00
028 A011300       823
028 A021300       248
028 A031300         0
028 A041300       736
028 B011300       619
028 B021300       247
028 B031300         0
028 B041300       933
028 C011300       435
028 C021300       249
028 C031300         0
028 C041300      1072
028 D011300       856
028 D021300       239
028 D031300         0
028 D041300       639
028 E011300       515
028 E021300       241
028 E031300         0
<PAGE>      PAGE  42
028 E041300      1271
028 F011300       920
028 F021300       239
028 F031300         0
028 F041300      1439
028 G011300      4168
028 G021300      1463
028 G031300         0
028 G041300      6090
028 H001300      1967
029  001300 Y
030 A001300    190
030 B001300  4.75
030 C001300  0.00
031 A001300     35
031 B001300      0
032  001300    155
033  001300      0
034  001300 Y
035  001300     35
036 A001300 N
036 B001300      0
042 A001300   0
042 B001300   0
042 C001300  42
042 D001300  58
042 E001300   0
042 F001300   0
042 G001300   0
042 H001300   0
043  001300    547
044  001300      0
045  001300 Y
046  001300 N
047  001300 Y
048  001300  0.550
048 A011300        0
048 A021300 0.000
048 B011300        0
048 B021300 0.000
048 C011300        0
048 C021300 0.000
048 D011300        0
048 D021300 0.000
048 E011300        0
048 E021300 0.000
048 F011300        0
048 F021300 0.000
048 G011300        0
048 G021300 0.000
048 H011300        0
<PAGE>      PAGE  43
048 H021300 0.000
048 I011300        0
048 I021300 0.000
048 J011300        0
048 J021300 0.000
048 K011300        0
048 K021300 0.000
049  001300 N
050  001300 N
051  001300 N
052  001300 N
053 A001300 Y
053 B001300 Y
053 C001300 Y
055 A001300 N
055 B001300 N
056  001300 Y
057  001300 N
058 A001300 N
059  001300 Y
060 A001300 N
060 B001300 N
061  001300     1000
062 A001300 Y
062 B001300   0.0
062 C001300   0.0
062 D001300   0.0
062 E001300   0.2
062 F001300   0.0
062 G001300   0.0
062 H001300   0.0
062 I001300   0.0
062 J001300   0.0
062 K001300   0.0
062 L001300   0.0
062 M001300   0.0
062 N001300   0.0
062 O001300  98.5
062 P001300   0.0
062 Q001300   0.0
062 R001300   0.0
063 A001300   0
063 B001300 17.6
064 A001300 Y
064 B001300 N
070 A011300 Y
070 A021300 N
070 B011300 N
070 B021300 N
070 C011300 Y
070 C021300 N
<PAGE>      PAGE  44
070 D011300 N
070 D021300 N
070 E011300 Y
070 E021300 N
070 F011300 N
070 F021300 N
070 G011300 Y
070 G021300 N
070 H011300 N
070 H021300 N
070 I011300 N
070 I021300 N
070 J011300 Y
070 J021300 N
070 K011300 N
070 K021300 N
070 L011300 N
070 L021300 N
070 M011300 N
070 M021300 N
070 N011300 N
070 N021300 N
070 O011300 Y
070 O021300 N
070 P011300 Y
070 P021300 N
070 Q011300 N
070 Q021300 N
070 R011300 N
070 R021300 N
071 A001300     31733
071 B001300     32999
071 C001300    122524
071 D001300   26
072 A001300 12
072 B001300     7588
072 C001300        0
072 D001300        0
072 E001300        0
072 F001300      691
072 G001300       18
072 H001300        0
072 I001300      158
072 J001300       51
072 K001300        7
072 L001300       10
072 M001300       18
072 N001300        0
072 O001300        0
072 P001300        0
072 Q001300        0
<PAGE>      PAGE  45
072 R001300       34
072 S001300        3
072 T001300      546
072 U001300        0
072 V001300        0
072 W001300       43
072 X001300     1579
072 Y001300      145
072 Z001300     6154
072AA001300     1327
072BB001300        0
072CC011300     5784
072CC021300        0
072DD011300     5445
072DD021300      709
072EE001300        0
073 A011300   0.5300
073 A021300   0.4600
073 B001300   0.0000
073 C001300   0.0000
074 A001300       85
074 B001300        0
074 C001300      300
074 D001300   125133
074 E001300        0
074 F001300        0
074 G001300        0
074 H001300        0
074 I001300        0
074 J001300      135
074 K001300        0
074 L001300     1872
074 M001300        1
074 N001300   127526
074 O001300        0
074 P001300       11
074 Q001300        0
074 R011300        0
074 R021300        0
074 R031300        0
074 R041300      446
074 S001300        0
074 T001300   127069
074 U011300     9975
074 U021300     1668
074 V011300    10.91
074 V021300    10.91
074 W001300   0.0000
074 X001300     2332
074 Y001300        0
075 A001300        0
<PAGE>      PAGE  46
075 B001300   125965
076  001300     0.00
028 A011400       540
028 A021400       136
028 A031400         0
028 A041400      1441
028 B011400       289
028 B021400       137
028 B031400         0
028 B041400       413
028 C011400       626
028 C021400       653
028 C031400         0
028 C041400       579
028 D011400       594
028 D021400       140
028 D031400         0
028 D041400       586
028 E011400       126
028 E021400       141
028 E031400         0
028 E041400       811
028 F011400       386
028 F021400       139
028 F031400         0
028 F041400       518
028 G011400      2561
028 G021400      1346
028 G031400         0
028 G041400      4348
028 H001400      1504
029  001400 Y
030 A001400     80
030 B001400  4.75
030 C001400  0.00
031 A001400     15
031 B001400      0
032  001400     65
033  001400      0
034  001400 Y
035  001400      8
036 A001400 N
036 B001400      0
042 A001400   0
042 B001400   0
042 C001400  21
042 D001400  79
042 E001400   0
042 F001400   0
042 G001400   0
042 H001400   0
<PAGE>      PAGE  47
043  001400    267
044  001400      0
045  001400 Y
046  001400 N
047  001400 Y
048  001400  0.550
048 A011400        0
048 A021400 0.000
048 B011400        0
048 B021400 0.000
048 C011400        0
048 C021400 0.000
048 D011400        0
048 D021400 0.000
048 E011400        0
048 E021400 0.000
048 F011400        0
048 F021400 0.000
048 G011400        0
048 G021400 0.000
048 H011400        0
048 H021400 0.000
048 I011400        0
048 I021400 0.000
048 J011400        0
048 J021400 0.000
048 K011400        0
048 K021400 0.000
049  001400 N
050  001400 N
051  001400 N
052  001400 N
053 A001400 Y
053 B001400 Y
053 C001400 Y
055 A001400 N
055 B001400 N
056  001400 Y
057  001400 N
058 A001400 N
059  001400 Y
060 A001400 N
060 B001400 N
061  001400     1000
062 A001400 Y
062 B001400   0.0
062 C001400   0.0
062 D001400   0.0
062 E001400   1.2
062 F001400   0.0
062 G001400   0.0
<PAGE>      PAGE  48
062 H001400   0.0
062 I001400   0.0
062 J001400   0.0
062 K001400   0.0
062 L001400   0.0
062 M001400   0.0
062 N001400   0.0
062 O001400  98.7
062 P001400   0.0
062 Q001400   0.0
062 R001400   0.0
063 A001400   0
063 B001400 17.0
064 A001400 Y
064 B001400 N
070 A011400 Y
070 A021400 N
070 B011400 N
070 B021400 N
070 C011400 Y
070 C021400 N
070 D011400 N
070 D021400 N
070 E011400 Y
070 E021400 Y
070 F011400 N
070 F021400 N
070 G011400 Y
070 G021400 N
070 H011400 N
070 H021400 N
070 I011400 N
070 I021400 N
070 J011400 Y
070 J021400 N
070 K011400 N
070 K021400 N
070 L011400 N
070 L021400 N
070 M011400 N
070 M021400 N
070 N011400 N
070 N021400 N
070 O011400 Y
070 O021400 N
070 P011400 Y
070 P021400 N
070 Q011400 N
070 Q021400 N
070 R011400 N
070 R021400 N
<PAGE>      PAGE  49
071 A001400     17533
071 B001400     20391
071 C001400     82859
071 D001400   21
072 A001400 12
072 B001400     5186
072 C001400        0
072 D001400        0
072 E001400        0
072 F001400      462
072 G001400       12
072 H001400        0
072 I001400      106
072 J001400       36
072 K001400        3
072 L001400        8
072 M001400       18
072 N001400        0
072 O001400        0
072 P001400        0
072 Q001400        0
072 R001400       30
072 S001400        2
072 T001400      267
072 U001400        0
072 V001400        0
072 W001400       50
072 X001400      994
072 Y001400       67
072 Z001400     4259
072AA001400      804
072BB001400        0
072CC011400        0
072CC021400     2739
072DD011400     3952
072DD021400      329
072EE001400        0
073 A011400   0.5500
073 A021400   0.4700
073 B001400   0.1300
073 C001400   0.0000
074 A001400       46
074 B001400        0
074 C001400     1000
074 D001400    82487
074 E001400        0
074 F001400        0
074 G001400        0
074 H001400        0
074 I001400        0
074 J001400       80
<PAGE>      PAGE  50
074 K001400        0
074 L001400     1316
074 M001400        1
074 N001400    84930
074 O001400      967
074 P001400        6
074 Q001400        0
074 R011400        0
074 R021400        0
074 R031400        0
074 R041400      345
074 S001400        0
074 T001400    83612
074 U011400     6993
074 U021400      747
074 V011400    10.80
074 V021400    10.80
074 W001400   0.0000
074 X001400     1333
074 Y001400       53
075 A001400        0
075 B001400    84376
076  001400     0.00
028 A011500       366
028 A021500       275
028 A031500         0
028 A041500      2134
028 B011500       605
028 B021500       271
028 B031500         0
028 B041500      2208
028 C011500       372
028 C021500       264
028 C031500         0
028 C041500      1867
028 D011500       502
028 D021500       264
028 D031500         0
028 D041500      1697
028 E011500       351
028 E021500       265
028 E031500         0
028 E041500      1648
028 F011500       695
028 F021500       264
028 F031500         0
028 F041500      1677
028 G011500      2891
028 G021500      1603
028 G031500         0
028 G041500     11231
<PAGE>      PAGE  51
028 H001500      2289
029  001500 Y
030 A001500    126
030 B001500  4.75
030 C001500  0.00
031 A001500     23
031 B001500      0
032  001500    103
033  001500      0
034  001500 Y
035  001500     26
036 A001500 N
036 B001500      0
042 A001500   0
042 B001500   0
042 C001500  28
042 D001500  72
042 E001500   0
042 F001500   0
042 G001500   0
042 H001500   0
043  001500    205
044  001500      0
045  001500 Y
046  001500 N
047  001500 Y
048  001500  0.550
048 A011500        0
048 A021500 0.000
048 B011500        0
048 B021500 0.000
048 C011500        0
048 C021500 0.000
048 D011500        0
048 D021500 0.000
048 E011500        0
048 E021500 0.000
048 F011500        0
048 F021500 0.000
048 G011500        0
048 G021500 0.000
048 H011500        0
048 H021500 0.000
048 I011500        0
048 I021500 0.000
048 J011500        0
048 J021500 0.000
048 K011500        0
048 K021500 0.000
049  001500 N
050  001500 N
<PAGE>      PAGE  52
051  001500 N
052  001500 N
053 A001500 Y
053 B001500 Y
053 C001500 Y
055 A001500 Y
055 B001500 N
056  001500 Y
057  001500 N
058 A001500 N
059  001500 Y
060 A001500 N
060 B001500 N
061  001500     1000
062 A001500 Y
062 B001500   0.0
062 C001500   0.0
062 D001500   0.0
062 E001500   1.7
062 F001500   0.0
062 G001500   0.0
062 H001500   0.0
062 I001500   0.0
062 J001500   0.0
062 K001500   0.0
062 L001500   0.0
062 M001500   0.0
062 N001500   0.0
062 O001500  97.3
062 P001500   0.0
062 Q001500   0.0
062 R001500   0.0
063 A001500   0
063 B001500 15.9
064 A001500 Y
064 B001500 N
070 A011500 Y
070 A021500 N
070 B011500 N
070 B021500 N
070 C011500 Y
070 C021500 N
070 D011500 N
070 D021500 N
070 E011500 Y
070 E021500 Y
070 F011500 N
070 F021500 N
070 G011500 Y
070 G021500 N
070 H011500 N
<PAGE>      PAGE  53
070 H021500 N
070 I011500 N
070 I021500 N
070 J011500 Y
070 J021500 N
070 K011500 N
070 K021500 N
070 L011500 N
070 L021500 N
070 M011500 N
070 M021500 N
070 N011500 N
070 N021500 N
070 O011500 Y
070 O021500 N
070 P011500 Y
070 P021500 N
070 Q011500 N
070 Q021500 N
070 R011500 N
070 R021500 N
071 A001500     20866
071 B001500     40387
071 C001500    142598
071 D001500   15
072 A001500 12
072 B001500     8517
072 C001500        0
072 D001500        0
072 E001500        0
072 F001500      802
072 G001500       21
072 H001500        0
072 I001500      184
072 J001500       55
072 K001500       11
072 L001500       18
072 M001500       17
072 N001500        0
072 O001500        0
072 P001500        0
072 Q001500        0
072 R001500       32
072 S001500        2
072 T001500      206
072 U001500        0
072 V001500        0
072 W001500       59
072 X001500     1407
072 Y001500      108
072 Z001500     7218
<PAGE>      PAGE  54
072AA001500        0
072BB001500      504
072CC011500     6363
072CC021500        0
072DD011500     6905
072DD021500      313
072EE001500        0
073 A011500   0.5000
073 A021500   0.4200
073 B001500   0.0000
073 C001500   0.0000
074 A001500       32
074 B001500        0
074 C001500     2400
074 D001500   137595
074 E001500        0
074 F001500        0
074 G001500        0
074 H001500        0
074 I001500        0
074 J001500       14
074 K001500        0
074 L001500     2083
074 M001500        1
074 N001500   142125
074 O001500        0
074 P001500       11
074 Q001500        0
074 R011500        0
074 R021500        0
074 R031500        0
074 R041500      672
074 S001500        0
074 T001500   141442
074 U011500    13165
074 U021500      724
074 V011500    10.18
074 V021500    10.18
074 W001500   0.0000
074 X001500     2889
074 Y001500        0
075 A001500        0
075 B001500   146492
076  001500     0.00
028 A011700      1391
028 A021700       144
028 A031700         0
028 A041700      1520
028 B011700       818
028 B021700       143
028 B031700         0
<PAGE>      PAGE  55
028 B041700      1072
028 C011700      9358
028 C021700       144
028 C031700         0
028 C041700      1388
028 D011700      1398
028 D021700       144
028 D031700         0
028 D041700      7073
028 E011700       576
028 E021700       138
028 E031700         0
028 E041700      3102
028 F011700       530
028 F021700       137
028 F031700         0
028 F041700      1678
028 G011700     14071
028 G021700       850
028 G031700         0
028 G041700     15833
028 H001700     11416
029  001700 Y
030 A001700    101
030 B001700  4.75
030 C001700  0.00
031 A001700     18
031 B001700      0
032  001700     83
033  001700      0
034  001700 Y
035  001700     41
036 A001700 N
036 B001700      0
042 A001700   0
042 B001700   0
042 C001700  93
042 D001700   7
042 E001700   0
042 F001700   0
042 G001700   0
042 H001700   0
043  001700    127
044  001700      0
045  001700 Y
046  001700 N
047  001700 Y
048  001700  0.550
048 A011700        0
048 A021700 0.000
048 B011700        0
<PAGE>      PAGE  56
048 B021700 0.000
048 C011700        0
048 C021700 0.000
048 D011700        0
048 D021700 0.000
048 E011700        0
048 E021700 0.000
048 F011700        0
048 F021700 0.000
048 G011700        0
048 G021700 0.000
048 H011700        0
048 H021700 0.000
048 I011700        0
048 I021700 0.000
048 J011700        0
048 J021700 0.000
048 K011700        0
048 K021700 0.000
049  001700 N
050  001700 N
051  001700 N
052  001700 N
053 A001700 Y
053 B001700 Y
053 C001700 Y
055 A001700 Y
055 B001700 Y
056  001700 Y
057  001700 N
058 A001700 N
059  001700 Y
060 A001700 N
060 B001700 N
061  001700     1000
062 A001700 Y
062 B001700   0.0
062 C001700   0.0
062 D001700   0.0
062 E001700   1.0
062 F001700   0.0
062 G001700   0.0
062 H001700   0.0
062 I001700   0.0
062 J001700   0.0
062 K001700   0.0
062 L001700   0.0
062 M001700   0.0
062 N001700   0.0
062 O001700  98.8
062 P001700   0.0
<PAGE>      PAGE  57
062 Q001700   0.0
062 R001700   0.0
063 A001700   0
063 B001700 16.6
064 A001700 Y
064 B001700 N
070 A011700 Y
070 A021700 N
070 B011700 N
070 B021700 N
070 C011700 Y
070 C021700 N
070 D011700 N
070 D021700 N
070 E011700 Y
070 E021700 Y
070 F011700 N
070 F021700 N
070 G011700 Y
070 G021700 N
070 H011700 N
070 H021700 N
070 I011700 N
070 I021700 N
070 J011700 Y
070 J021700 N
070 K011700 N
070 K021700 N
070 L011700 N
070 L021700 N
070 M011700 N
070 M021700 N
070 N011700 N
070 N021700 N
070 O011700 Y
070 O021700 N
070 P011700 Y
070 P021700 N
070 Q011700 N
070 Q021700 N
070 R011700 N
070 R021700 N
071 A001700     13381
071 B001700     15884
071 C001700     96621
071 D001700   14
072 A001700 12
072 B001700     5529
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072 D001700        0
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<PAGE>      PAGE  58
072 F001700      522
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072 H001700        0
072 I001700      119
072 J001700       37
072 K001700        7
072 L001700        9
072 M001700       16
072 N001700        0
072 O001700        0
072 P001700        0
072 Q001700        0
072 R001700       30
072 S001700        5
072 T001700      126
072 U001700        0
072 V001700        0
072 W001700       48
072 X001700      933
072 Y001700       73
072 Z001700     4669
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072BB001700      679
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072EE001700        0
073 A011700   0.5000
073 A021700   0.4200
073 B001700   0.0000
073 C001700   0.0000
074 A001700       16
074 B001700        0
074 C001700      900
074 D001700    93320
074 E001700        0
074 F001700        0
074 G001700        0
074 H001700        0
074 I001700        0
074 J001700        0
074 K001700        0
074 L001700     1745
074 M001700       13
074 N001700    95994
074 O001700        0
074 P001700        7
074 Q001700        0
074 R011700        0
074 R021700        0
<PAGE>      PAGE  59
074 R031700        0
074 R041700     1557
074 S001700        0
074 T001700    94430
074 U011700     7697
074 U021700     1656
074 V011700    10.10
074 V021700    10.09
074 W001700   0.0000
074 X001700     1581
074 Y001700        0
075 A001700        0
075 B001700    95374
076  001700     0.00
028 A011800       159
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028 B031800         0
028 B041800       315
028 C011800        94
028 C021800       134
028 C031800         0
028 C041800      1041
028 D011800       314
028 D021800       133
028 D031800         0
028 D041800      1001
028 E011800       184
028 E021800       133
028 E031800         0
028 E041800       373
028 F011800      1175
028 F021800       136
028 F031800         0
028 F041800       741
028 G011800      2404
028 G021800       802
028 G031800         0
028 G041800      4162
028 H001800      2016
029  001800 Y
030 A001800    101
030 B001800  4.75
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031 A001800     17
031 B001800      0
032  001800     84
033  001800      0
<PAGE>      PAGE  60
034  001800 Y
035  001800     49
036 A001800 N
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042 A001800   0
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042 C001800  96
042 D001800   4
042 E001800   0
042 F001800   0
042 G001800   0
042 H001800   0
043  001800     85
044  001800      0
045  001800 Y
046  001800 N
047  001800 Y
048  001800  0.550
048 A011800        0
048 A021800 0.000
048 B011800        0
048 B021800 0.000
048 C011800        0
048 C021800 0.000
048 D011800        0
048 D021800 0.000
048 E011800        0
048 E021800 0.000
048 F011800        0
048 F021800 0.000
048 G011800        0
048 G021800 0.000
048 H011800        0
048 H021800 0.000
048 I011800        0
048 I021800 0.000
048 J011800        0
048 J021800 0.000
048 K011800        0
048 K021800 0.000
049  001800 N
050  001800 N
051  001800 N
052  001800 N
053 A001800 Y
053 B001800 Y
053 C001800 Y
055 A001800 N
055 B001800 N
056  001800 Y
057  001800 N
<PAGE>      PAGE  61
058 A001800 N
059  001800 Y
060 A001800 N
060 B001800 N
061  001800     1000
062 A001800 Y
062 B001800   0.0
062 C001800   0.0
062 D001800   0.0
062 E001800   1.4
062 F001800   0.0
062 G001800   0.0
062 H001800   0.0
062 I001800   0.0
062 J001800   0.0
062 K001800   0.0
062 L001800   0.0
062 M001800   0.0
062 N001800   0.0
062 O001800  98.2
062 P001800   0.0
062 Q001800   0.0
062 R001800   0.0
063 A001800   0
063 B001800 18.9
064 A001800 Y
064 B001800 N
070 A011800 Y
070 A021800 N
070 B011800 N
070 B021800 N
070 C011800 Y
070 C021800 N
070 D011800 N
070 D021800 N
070 E011800 Y
070 E021800 N
070 F011800 N
070 F021800 N
070 G011800 Y
070 G021800 N
070 H011800 N
070 H021800 N
070 I011800 N
070 I021800 N
070 J011800 Y
070 J021800 N
070 K011800 N
070 K021800 N
070 L011800 N
070 L021800 N
<PAGE>      PAGE  62
070 M011800 N
070 M021800 N
070 N011800 N
070 N021800 N
070 O011800 Y
070 O021800 N
070 P011800 Y
070 P021800 N
070 Q011800 N
070 Q021800 N
070 R011800 N
070 R021800 N
071 A001800     13656
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072 A001800 12
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072 K001800        4
072 L001800        8
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072 S001800        3
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072 U001800        1
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072 X001800      743
072 Y001800       59
072 Z001800     3797
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073 A011800   0.4800
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<PAGE>      PAGE  63
073 B001800   0.0000
073 C001800   0.0000
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074 B001800        0
074 C001800     1100
074 D001800    75373
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074 F001800        0
074 G001800        0
074 H001800        0
074 I001800        0
074 J001800        0
074 K001800        0
074 L001800     1489
074 M001800       10
074 N001800    78044
074 O001800     1005
074 P001800        5
074 Q001800        0
074 R011800        0
074 R021800        0
074 R031800        0
074 R041800      255
074 S001800        0
074 T001800    76779
074 U011800     6685
074 U021800     1083
074 V011800     9.88
074 V021800     9.89
074 W001800   0.0000
074 X001800     1817
074 Y001800        0
075 A001800        0
075 B001800    77016
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028 A012100       823
028 A022100        82
028 A032100         0
028 A042100       866
028 B012100       680
028 B022100        85
028 B032100         0
028 B042100       376
028 C012100       891
028 C022100        88
028 C032100         0
028 C042100       575
028 D012100       539
028 D022100        80
028 D032100         0
028 D042100      1758
<PAGE>      PAGE  64
028 E012100       638
028 E022100        83
028 E032100         0
028 E042100       693
028 F012100       820
028 F022100        82
028 F032100         0
028 F042100       631
028 G012100      4391
028 G022100       500
028 G032100         0
028 G042100      4899
028 H002100      2712
029  002100 Y
030 A002100    109
030 B002100  4.75
030 C002100  0.00
031 A002100     20
031 B002100      0
032  002100     89
033  002100      0
034  002100 Y
035  002100     26
036 A002100 N
036 B002100      0
042 A002100   0
042 B002100   0
042 C002100  95
042 D002100   5
042 E002100   0
042 F002100   0
042 G002100   0
042 H002100   0
043  002100    176
044  002100      0
045  002100 Y
046  002100 N
047  002100 Y
048  002100  0.550
048 A012100        0
048 A022100 0.000
048 B012100        0
048 B022100 0.000
048 C012100        0
048 C022100 0.000
048 D012100        0
048 D022100 0.000
048 E012100        0
048 E022100 0.000
048 F012100        0
048 F022100 0.000
<PAGE>      PAGE  65
048 G012100        0
048 G022100 0.000
048 H012100        0
048 H022100 0.000
048 I012100        0
048 I022100 0.000
048 J012100        0
048 J022100 0.000
048 K012100        0
048 K022100 0.000
049  002100 N
050  002100 N
051  002100 N
052  002100 N
053 A002100 Y
053 B002100 Y
053 C002100 Y
055 A002100 Y
055 B002100 N
056  002100 Y
057  002100 N
058 A002100 N
059  002100 Y
060 A002100 N
060 B002100 N
061  002100     1000
062 A002100 Y
062 B002100   0.0
062 C002100   0.0
062 D002100   0.0
062 E002100   1.5
062 F002100   0.0
062 G002100   0.0
062 H002100   0.0
062 I002100   0.0
062 J002100   0.0
062 K002100   0.0
062 L002100   0.0
062 M002100   0.0
062 N002100   0.0
062 O002100  97.1
062 P002100   0.0
062 Q002100   0.0
062 R002100   0.0
063 A002100   0
063 B002100 15.4
064 A002100 Y
064 B002100 N
070 A012100 Y
070 A022100 N
070 B012100 N
<PAGE>      PAGE  66
070 B022100 N
070 C012100 Y
070 C022100 N
070 D012100 N
070 D022100 N
070 E012100 Y
070 E022100 N
070 F012100 N
070 F022100 N
070 G012100 Y
070 G022100 N
070 H012100 N
070 H022100 N
070 I012100 N
070 I022100 N
070 J012100 Y
070 J022100 N
070 K012100 N
070 K022100 N
070 L012100 N
070 L022100 N
070 M012100 N
070 M022100 N
070 N012100 N
070 N022100 N
070 O012100 Y
070 O022100 N
070 P012100 Y
070 P022100 N
070 Q012100 N
070 Q022100 N
070 R012100 N
070 R022100 N
071 A002100     11864
071 B002100     15264
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071 D002100   31
072 A002100 12
072 B002100     2201
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072 E002100        0
072 F002100      219
072 G002100        6
072 H002100        0
072 I002100       50
072 J002100       20
072 K002100        5
072 L002100        6
072 M002100       17
072 N002100        0
<PAGE>      PAGE  67
072 O002100        0
072 P002100        0
072 Q002100        0
072 R002100       30
072 S002100        3
072 T002100      174
072 U002100        1
072 V002100        0
072 W002100       37
072 X002100      568
072 Y002100      245
072 Z002100     1878
072AA002100      370
072BB002100        0
072CC012100     1974
072CC022100        0
072DD012100      912
072DD022100      972
072EE002100        0
073 A012100   0.5000
073 A022100   0.4200
073 B002100   0.0000
073 C002100   0.0000
074 A002100       38
074 B002100        0
074 C002100      600
074 D002100    38300
074 E002100        0
074 F002100        0
074 G002100        0
074 H002100        0
074 I002100        0
074 J002100       15
074 K002100        0
074 L002100      639
074 M002100        1
074 N002100    39593
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074 P002100        5
074 Q002100        0
074 R012100        0
074 R022100        0
074 R032100        0
074 R042100      120
074 S002100        0
074 T002100    39468
074 U012100     1927
074 U022100     2089
074 V012100     9.82
074 V022100     9.84
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<PAGE>      PAGE  68
074 X002100     1307
074 Y002100        0
075 A002100        0
075 B002100    39791
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028 D042200      6523
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028 F042200      6080
028 G012200     30841
028 G022200      2762
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031 B002200      0
032  002200    380
033  002200      0
034  002200 Y
035  002200    103
036 A002200 N
036 B002200      0
042 A002200   0
042 B002200   0
042 C002200  82
042 D002200  18
042 E002200   0
<PAGE>      PAGE  69
042 F002200   0
042 G002200   0
042 H002200   0
043  002200    366
044  002200      0
045  002200 Y
046  002200 N
047  002200 Y
048  002200  0.550
048 A012200        0
048 A022200 0.000
048 B012200        0
048 B022200 0.000
048 C012200        0
048 C022200 0.000
048 D012200        0
048 D022200 0.000
048 E012200        0
048 E022200 0.000
048 F012200        0
048 F022200 0.000
048 G012200        0
048 G022200 0.000
048 H012200        0
048 H022200 0.000
048 I012200        0
048 I022200 0.000
048 J012200        0
048 J022200 0.000
048 K012200        0
048 K022200 0.000
049  002200 N
050  002200 N
051  002200 N
052  002200 N
053 A002200 Y
053 B002200 Y
053 C002200 Y
055 A002200 N
055 B002200 N
056  002200 Y
057  002200 N
058 A002200 N
059  002200 Y
060 A002200 N
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061  002200     1000
062 A002200 Y
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062 C002200   0.0
062 D002200   0.0
<PAGE>      PAGE  70
062 E002200   0.7
062 F002200   0.0
062 G002200   0.0
062 H002200   0.0
062 I002200   0.0
062 J002200   0.0
062 K002200   0.0
062 L002200   0.0
062 M002200   0.0
062 N002200   0.0
062 O002200  96.2
062 P002200   0.0
062 Q002200   0.0
062 R002200   0.0
063 A002200   0
063 B002200 14.8
064 A002200 Y
064 B002200 N
070 A012200 Y
070 A022200 N
070 B012200 N
070 B022200 N
070 C012200 Y
070 C022200 N
070 D012200 N
070 D022200 N
070 E012200 Y
070 E022200 N
070 F012200 N
070 F022200 N
070 G012200 Y
070 G022200 N
070 H012200 N
070 H022200 N
070 I012200 N
070 I022200 N
070 J012200 Y
070 J022200 N
070 K012200 N
070 K022200 N
070 L012200 N
070 L022200 N
070 M012200 N
070 M022200 N
070 N012200 N
070 N022200 N
070 O012200 Y
070 O022200 N
070 P012200 Y
070 P022200 N
070 Q012200 N
<PAGE>      PAGE  71
070 Q022200 N
070 R012200 N
070 R022200 N
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072 A002200 12
072 B002200    15494
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072 E002200        0
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072 G002200       38
072 H002200        0
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072 L002200       25
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072 R002200       32
072 S002200        7
072 T002200      363
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072 V002200        0
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072 X002200     2510
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072 Z002200    13418
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072DD012200    11527
072DD022200     1703
072EE002200        0
073 A012200   0.2900
073 A022200   0.2400
073 B002200   0.0000
073 C002200   0.0000
074 A002200       69
074 B002200        0
074 C002200     1800
074 D002200   260487
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<PAGE>      PAGE  72
074 H002200        0
074 I002200        0
074 J002200     4528
074 K002200        0
074 L002200     4806
074 M002200        3
074 N002200   271693
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028 C032300         0
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028 D042300     15356
028 E012300     10214
028 E022300      1249
028 E032300         0
028 E042300     14429
028 F012300     10741
028 F022300       822
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028 F042300     14439
028 G012300     63433
<PAGE>      PAGE  73
028 G022300      5415
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028 G042300     79893
028 H002300     53140
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031 A002300     27
031 B002300      0
032  002300    131
033  002300      0
034  002300 Y
035  002300    262
036 A002300 N
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042 A002300   0
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042 D002300  43
042 E002300   0
042 F002300   0
042 G002300   0
042 H002300   0
043  002300   2430
044  002300      0
045  002300 Y
046  002300 N
047  002300 N
048  002300  0.000
048 A012300        0
048 A022300 0.000
048 B012300        0
048 B022300 0.000
048 C012300        0
048 C022300 0.000
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048 D022300 0.000
048 E012300        0
048 E022300 0.000
048 F012300        0
048 F022300 0.000
048 G012300        0
048 G022300 0.000
048 H012300        0
048 H022300 0.000
048 I012300        0
048 I022300 0.000
048 J012300        0
048 J022300 0.000
048 K012300        0
<PAGE>      PAGE  74
048 K022300 0.000
049  002300 N
050  002300 Y
051  002300 N
052  002300 N
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053 B002300 N
053 C002300 Y
055 A002300 Y
055 B002300 N
056  002300 Y
057  002300 N
058 A002300 N
059  002300 Y
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060 B002300 Y
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062 A002300 Y
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062 C002300   0.0
062 D002300   0.0
062 E002300   0.0
062 F002300   0.0
062 G002300   0.0
062 H002300   0.0
062 I002300   0.0
062 J002300   0.0
062 K002300   0.0
062 L002300   0.0
062 M002300   0.0
062 N002300   0.0
062 O002300  99.6
062 P002300   0.0
062 Q002300   0.0
062 R002300   0.0
063 A002300   0
063 B002300 17.4
064 A002300 Y
064 B002300 N
070 A012300 Y
070 A022300 N
070 B012300 N
070 B022300 N
070 C012300 Y
070 C022300 N
070 D012300 N
070 D022300 N
070 E012300 Y
070 E022300 Y
070 F012300 N
070 F022300 N
<PAGE>      PAGE  75
070 G012300 Y
070 G022300 N
070 H012300 N
070 H022300 N
070 I012300 N
070 I022300 N
070 J012300 Y
070 J022300 N
070 K012300 Y
070 K022300 N
070 L012300 N
070 L022300 N
070 M012300 N
070 M022300 N
070 N012300 Y
070 N022300 N
070 O012300 Y
070 O022300 N
070 P012300 Y
070 P022300 N
070 Q012300 N
070 Q022300 N
070 R012300 N
070 R022300 N
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072 A002300 12
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072 F002300     2841
072 G002300       56
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072 K002300       44
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072 M002300       42
072 N002300        0
072 O002300        0
072 P002300        0
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072 R002300       35
072 S002300        7
072 T002300     2616
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072 V002300        0
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<PAGE>      PAGE  76
072 X002300     6450
072 Y002300       50
072 Z002300    19617
072AA002300     4109
072BB002300        0
072CC012300    17549
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072DD012300     9236
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073 A012300   0.4800
073 A022300   0.4100
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074 A002300        3
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074 C002300        0
074 D002300   381599
074 E002300        0
074 F002300        0
074 G002300        0
074 H002300        0
074 I002300        0
074 J002300     1366
074 K002300        0
074 L002300     7814
074 M002300        4
074 N002300   390786
074 O002300     4476
074 P002300       43
074 Q002300        0
074 R012300        0
074 R022300        0
074 R032300        0
074 R042300     3070
074 S002300        0
074 T002300   383197
074 U012300    21031
074 U022300    19150
074 V012300     8.99
074 V022300     9.00
074 W002300   0.0000
074 X002300    10975
074 Y002300      182
075 A002300        0
075 B002300   390660
076  002300     0.00
SIGNATURE   ELLEN M. MOYNIHAN                            
TITLE       ASSISTANT TREASURER 
 


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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 171
   <NAME> MFS FLORIDA MUNICIPAL BOND FUND CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 172
   <NAME> MFS FLORIDA MUNICIPAL BOND FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 071
   <NAME> MFS GEORGIA MUNICIPAL BOND FUND CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 072
   <NAME> MFS GEORGIA MUNICIPAL BOND FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 061
   <NAME> MFS MASSACHUSETTS MUNICIPAL BOND FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 062
   <NAME> MFS MASSACHUSETTS MUNICIPAL BOND FUND CLASS B
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 011
   <NAME> MFS MARYLAND MUNICIPAL BOND FUND CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 012
   <NAME> MFS MARYLAND MUNICIPAL BOND FUND CLASS B
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 231
   <NAME> MFS MUNICIPAL INCOME FUND CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 232
   <NAME> MFS MUNICIPAL INCOME FUND CLASS B
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 233
   <NAME> MFS MUNICIPAL INCOME FUND CLASS C
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 181
   <NAME> MFS MISSISSIPPI MUNICIPAL BOND FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 182
   <NAME> MFS MISSISSIPPI MUNICIPAL BOND FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 021
   <NAME> MFS NORTH CAROLINA MUNICIPAL BOND FUND CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 022
   <NAME> MFS NORTH CAROLINA MUNICIPAL BOND FUND CLASS B
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 023
   <NAME> MFS NORTH CAROLINA MUNICIPAL BOND FUND CLASS C
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 111
   <NAME> MFS NEW YORK MUNICIPAL BOND FUND CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 112
   <NAME> MFS NEW YORK MUNICIPAL BOND FUND CLASS B
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 211
   <NAME> MFS PENNSYLVANIA MUNICIPAL BOND FUND CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 212
   <NAME> MFS PENNSYLVANIA MUNICIPAL BOND FUND CLASS B
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 031
   <NAME> MFS SOUTH CAROLINA MUNICIPAL BOND FUND CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 032
   <NAME> MFS SOUTH CAROLINA MUNICIPAL BOND FUND CLASS B
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 131
   <NAME> MFS TENNESSEE MUNICIPAL BOND FUND CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 132
   <NAME> MFS TENNESSEE MUNICIPAL BOND FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 041
   <NAME> MFS VIRGINIA MUNICIPAL BOND FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          MAR-31-1998
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 042
   <NAME> MFS VIRGINIA MUNICIPAL BOND FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 043
   <NAME> MFS VIRGINIA MUNICIPAL BOND FUND CLASS C
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 051
   <NAME> MFS WEST VIRGINIA MUNICIPAL BOND FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
   <NUMBER> 052
   <NAME> MFS WEST VIRGINIA MUNICIPAL BOND FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>


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