<PAGE> PAGE 1
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<PAGE> PAGE 2
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<PAGE> PAGE 3
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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<PAGE> PAGE 8
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<PAGE> PAGE 9
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<PAGE> PAGE 10
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<PAGE> PAGE 11
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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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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<PAGE> PAGE 17
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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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042 D000400 63
042 E000400 0
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043 000400 822
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047 000400 Y
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<PAGE> PAGE 21
048 G010400 0
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048 I010400 0
048 I020400 0.000
048 J010400 0
048 J020400 0.000
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049 000400 N
050 000400 N
051 000400 N
052 000400 N
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055 A000400 Y
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056 000400 Y
057 000400 N
058 A000400 N
059 000400 Y
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063 B000400 16.2
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070 A010400 Y
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<PAGE> PAGE 22
070 B020400 N
070 C010400 Y
070 C020400 N
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070 D020400 N
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070 E020400 Y
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070 F020400 N
070 G010400 Y
070 G020400 N
070 H010400 N
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 Y
070 K010400 Y
070 K020400 N
070 L010400 N
070 L020400 N
070 M010400 N
070 M020400 N
070 N010400 N
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 Y
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 N
070 R020400 N
071 A000400 20704
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<PAGE> PAGE 23
072 O000400 0
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<PAGE> PAGE 24
074 X000400 7880
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028 A020500 336
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028 G020500 1992
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<PAGE> PAGE 25
042 F000500 0
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050 000500 N
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056 000500 Y
057 000500 N
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<PAGE> PAGE 26
062 E000500 0.2
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070 H010500 N
070 H020500 N
070 I010500 N
070 I020500 N
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<PAGE> PAGE 27
070 Q020500 N
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<PAGE> PAGE 28
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<PAGE> PAGE 29
028 G020600 3011
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<PAGE> PAGE 30
048 K020600 0.000
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<PAGE> PAGE 31
070 G010600 Y
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<PAGE> PAGE 32
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<PAGE> PAGE 33
028 B010700 402
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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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<PAGE> PAGE 38
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<PAGE> PAGE 39
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<PAGE> PAGE 40
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<PAGE> PAGE 41
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074 M001100 2
074 N001100 134869
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074 T001100 134539
074 U011100 9954
074 U021100 2663
074 V011100 10.66
074 V021100 10.66
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028 A021300 274
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028 D011300 1154
<PAGE> PAGE 42
028 D021300 271
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<PAGE> PAGE 43
048 E021300 0.000
048 F011300 0
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048 G011300 0
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048 H011300 0
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048 I011300 0
048 I021300 0.000
048 J011300 0
048 J021300 0.000
048 K011300 0
048 K021300 0.000
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050 001300 N
051 001300 N
052 001300 N
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<PAGE> PAGE 44
070 A011300 Y
070 A021300 N
070 B011300 N
070 B021300 N
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070 E021300 Y
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 Y
070 K021300 N
070 L011300 N
070 L021300 N
070 M011300 N
070 M021300 N
070 N011300 N
070 N021300 N
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070 Q021300 N
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<PAGE> PAGE 45
072 L001300 3
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<PAGE> PAGE 46
074 V011300 10.28
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<PAGE> PAGE 47
042 C001400 29
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<PAGE> PAGE 48
062 B001400 0.0
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070 I021400 N
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070 K011400 Y
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<PAGE> PAGE 49
070 P011400 Y
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<PAGE> PAGE 50
074 E001400 0
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<PAGE> PAGE 51
028 F031500 0
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<PAGE> PAGE 52
048 J011500 0
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<PAGE> PAGE 53
070 E021500 Y
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<PAGE> PAGE 54
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<PAGE> PAGE 55
046 001600 N
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<PAGE> PAGE 56
028 G031700 0
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<PAGE> PAGE 57
049 001700 N
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<PAGE> PAGE 58
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<PAGE> PAGE 59
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<PAGE> PAGE 60
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<PAGE> PAGE 61
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059 001800 Y
060 A001800 N
060 B001800 N
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062 E001800 3.7
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062 H001800 0.0
062 I001800 0.0
062 J001800 0.0
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<PAGE> PAGE 62
062 O001800 95.9
062 P001800 0.0
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063 B001800 15.2
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 Y
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 Y
070 K011800 Y
070 K021800 N
070 L011800 N
070 L021800 N
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 7808
071 B001800 5975
071 C001800 75655
071 D001800 8
072 A001800 6
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<PAGE> PAGE 63
072 D001800 0
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072 U001800 0
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072 X001800 386
072 Y001800 71
072 Z001800 1918
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074 B001800 0
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<PAGE> PAGE 64
074 R011800 0
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075 A001800 0
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028 A012100 2113
028 A022100 100
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<PAGE> PAGE 65
032 002100 71
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044 002100 0
045 002100 Y
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047 002100 Y
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048 H022100 0.000
048 I012100 0
048 I022100 0.000
048 J012100 0
048 J022100 0.000
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048 K022100 0.000
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050 002100 N
051 002100 N
052 002100 N
053 A002100 Y
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053 C002100 Y
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<PAGE> PAGE 66
056 002100 Y
057 002100 N
058 A002100 N
059 002100 Y
060 A002100 N
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064 A002100 Y
064 B002100 N
070 A012100 Y
070 A022100 N
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070 B022100 N
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070 C022100 N
070 D012100 N
070 D022100 N
070 E012100 Y
070 E022100 Y
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 Y
070 K012100 Y
070 K022100 N
<PAGE> PAGE 67
070 L012100 N
070 L022100 N
070 M012100 N
070 M022100 N
070 N012100 N
070 N022100 N
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<PAGE> PAGE 68
073 A012100 0.2400
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028 A012200 7780
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<PAGE> PAGE 69
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<PAGE> PAGE 70
048 F012200 0
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048 K022200 0.000
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050 002200 N
051 002200 N
052 002200 N
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055 A002200 Y
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057 002200 N
058 A002200 N
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<PAGE> PAGE 71
070 A022200 N
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070 D022200 N
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070 F022200 N
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070 G022200 N
070 H012200 N
070 H022200 N
070 I012200 N
070 I022200 N
070 J012200 Y
070 J022200 Y
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070 K022200 N
070 L012200 N
070 L022200 N
070 M012200 N
070 M022200 N
070 N012200 N
070 N022200 N
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<PAGE> PAGE 72
072 M002200 10
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<PAGE> PAGE 73
074 V022200 5.57
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<PAGE> PAGE 74
042 D002300 54
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<PAGE> PAGE 75
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<PAGE> PAGE 76
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<PAGE> PAGE 77
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<PAGE> PAGE 78
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<PAGE> PAGE 79
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<PAGE> PAGE 80
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<PAGE> PAGE 81
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<PAGE> PAGE 82
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028 F032500 0
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028 G022500 3
028 G032500 0
028 G042500 0
028 H002500 0
029 002500 N
030 A002500 0
030 B002500 0.00
030 C002500 0.00
031 A002500 0
031 B002500 0
032 002500 0
033 002500 0
034 002500 N
035 002500 0
036 B002500 0
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042 C002500 0
042 D002500 0
042 E002500 0
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<PAGE> PAGE 83
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048 F012500 0
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048 H022500 0.000
048 I012500 0
048 I022500 0.000
048 J012500 0
048 J022500 0.000
048 K012500 0
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049 002500 N
050 002500 N
051 002500 N
052 002500 N
053 A002500 Y
053 B002500 Y
053 C002500 Y
055 A002500 Y
055 B002500 N
056 002500 Y
057 002500 N
058 A002500 N
059 002500 Y
060 A002500 N
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062 G002500 0.0
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<PAGE> PAGE 84
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070 A012500 Y
070 A022500 N
070 B012500 N
070 B022500 N
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070 C022500 N
070 D012500 N
070 D022500 N
070 E012500 Y
070 E022500 N
070 F012500 N
070 F022500 N
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070 G022500 N
070 H012500 N
070 H022500 N
070 I012500 N
070 I022500 N
070 J012500 Y
070 J022500 Y
070 K012500 Y
070 K022500 N
070 L012500 N
070 L022500 N
070 M012500 N
070 M022500 N
070 N012500 N
070 N022500 N
070 O012500 Y
070 O022500 N
070 P012500 Y
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070 Q012500 N
070 Q022500 N
070 R012500 N
070 R022500 N
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<PAGE> PAGE 85
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073 A022500 0.0000
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074 H002500 0
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<PAGE> PAGE 86
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<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> <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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<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>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
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<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
<NUMBER> 024
<NAME> MFS MASSACHUSETTS HIGH INCOME TAX FREE FUND CLASS A
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
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</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000751656
<NAME> MFS MUNICIPAL SERIES TRUST
<SERIES>
<NUMBER> 251
<NAME> MFS NEW YORK HIGH INCOME TAX FREE FUND CLASS A
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 508091
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<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 503588
<SHARES-COMMON-STOCK> 50361
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<ACCUM-APPREC-OR-DEPREC> (3687)
<NET-ASSETS> 499220
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<INTEREST-INCOME> 3380
<OTHER-INCOME> 0
<EXPENSES-NET> 0
<NET-INVESTMENT-INCOME> 3380
<REALIZED-GAINS-CURRENT> (681)
<APPREC-INCREASE-CURRENT> (3687)
<NET-CHANGE-FROM-OPS> (988)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3380)
<DISTRIBUTIONS-OF-GAINS> 0
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<NUMBER-OF-SHARES-SOLD> 50021
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 340
<NET-CHANGE-IN-ASSETS> 499220
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<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
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<GROSS-EXPENSE> 14052
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<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.07
<PER-SHARE-GAIN-APPREC> (0.09)
<PER-SHARE-DIVIDEND> (0.07)
<PER-SHARE-DISTRIBUTIONS> 0
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<EXPENSE-RATIO> 0.03
</TABLE>
SUB-ITEM 77C
The sole shareholder of each of the MFS Massachusetts High Income Tax Fund and
MFS New York High Income Tax Fund (each, a "Fund"), each a series of MFS
Municipal Series Trust (the "Trust"), took action by unanimous written consent,
as permitted by the Trust's Declaration of Trust, July 30, 1999, to approve the
following matters:
The terms of each Investment Advisory Agreement dated July 30, 199,
between the Trust on behalf of each Fund and Massachusetts Financial
Services Company; and
The selection of Deloitte & Touche LLP as independent public accountants
of each Fund.
34926
SUB-ITEM 77Q1
The investment advisory agreement for each of the MFS Massachusetts High Income
Tax Fund and MFS New York High Income Tax Fund (each, a "Fund"), each a series
of MFS Municipal Series Trust (the "Trust"),dated July 30, 1999, between the
Trust on behalf of each Fund and Massachusetts Financial Services Company, are
contained in the Trust's Post-Effective Amendment No. 33 to the Registration
Statement on Form N-1A (File Nos. 2-92915 and 811-4096), as filed with the
Securities and Exchange Commission via EDGAR on May 14, 1999. Such documents are
incorporated herein by reference.
The Amended and Restated Declaration of Trust of the Trust, dated April 29,
1999is contained in the Trust's Post-Effective Amendment No. 33 to the
Registration Statement on Form N-1A (File Nos. 2-92915 and 811-4096), as filed
with the Securities and Exchange Commission via EDGAR on May 14, 1999. Such
document is incorporated herein by reference.
