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<PAGE> PAGE 6
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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 19
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<PAGE> PAGE 21
028 G040700 11407
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049 000700 N
050 000700 N
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064 A000700 Y
064 B000700 N
070 A010700 N
070 A020700 N
070 B010700 N
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070 D010700 N
070 D020700 N
070 E010700 Y
070 E020700 N
070 F010700 N
070 F020700 N
070 G010700 Y
070 G020700 N
070 H010700 N
070 H020700 N
070 I010700 N
<PAGE> PAGE 22
070 I020700 N
070 J010700 Y
070 J020700 N
070 K010700 Y
070 K020700 N
070 L010700 N
070 L020700 N
070 M010700 N
070 M020700 N
070 N010700 N
070 N020700 N
070 O010700 N
070 O020700 N
070 P010700 Y
070 P020700 N
070 Q010700 N
070 Q020700 N
070 R010700 Y
070 R020700 N
071 A000700 19293
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072 B000700 1791
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<PAGE> PAGE 23
072CC010700 0
072CC020700 139
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072DD020700 0
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073 A010700 0.4000
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074 C000700 5610
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028 A010800 4027
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028 C010800 4789
<PAGE> PAGE 24
028 C020800 426
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028 D040800 2872
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028 F040800 4859
028 G010800 26678
028 G020800 3684
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028 G040800 24515
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049 000800 N
050 000800 N
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062 E000800 4.8
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062 L000800 0.2
062 M000800 0.0
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<PAGE> PAGE 25
064 B000800 N
070 A010800 N
070 A020800 N
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070 B020800 N
070 C010800 Y
070 C020800 N
070 D010800 N
070 D020800 N
070 E010800 Y
070 E020800 N
070 F010800 N
070 F020800 N
070 G010800 Y
070 G020800 N
070 H010800 N
070 H020800 N
070 I010800 N
070 I020800 N
070 J010800 Y
070 J020800 N
070 K010800 Y
070 K020800 N
070 L010800 N
070 L020800 N
070 M010800 N
070 M020800 N
070 N010800 N
070 N020800 N
070 O010800 N
070 O020800 N
070 P010800 Y
070 P020800 N
070 Q010800 N
070 Q020800 N
070 R010800 Y
070 R020800 N
071 A000800 58016
071 B000800 46115
071 C000800 144055
071 D000800 32
072 A000800 12
072 B000800 7317
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<PAGE> PAGE 26
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<PAGE> PAGE 27
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028 A010900 5729
028 A020900 2080
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028 B040900 5892
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028 C040900 7980
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028 D040900 6361
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028 E040900 5441
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<PAGE> PAGE 28
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070 E020900 N
070 F010900 N
070 F020900 N
070 G010900 Y
070 G020900 N
070 H010900 N
070 H020900 N
070 I010900 N
070 I020900 N
070 J010900 Y
070 J020900 N
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070 K020900 N
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070 L020900 N
070 M010900 N
070 M020900 N
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070 N020900 N
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070 O020900 N
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070 P020900 N
<PAGE> PAGE 29
070 Q010900 N
070 Q020900 N
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070 R020900 N
071 A000900 99652
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072 B000900 6419
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<PAGE> PAGE 30
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028 A011000 3951
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<PAGE> PAGE 31
028 G011000 16057
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<PAGE> PAGE 32
070 H011000 N
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070 L021000 N
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070 R021000 N
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<PAGE> PAGE 33
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SIGNATURE MARYANNE ROEPKE
TITLE TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE ANNUAL REPORT OF AMERICAN CENTURY CAPITAL PORTFOLIOS, INC. AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000746458
<NAME> AMERICAN CENTURY MUNICIPAL TRUST
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<NAME> TAX-FREE MONEY MARKET
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE ANNUAL REPORT OF AMERICAN CENTURY CAPITAL PORTFOLIOS, INC. AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000746458
<NAME> AMERICAN CENTURY MUNICIPAL TRUST
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
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IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000746458
<NAME> AMERICAN CENTURY MUNICIPAL TRUST
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<NET-CHANGE-IN-ASSETS> 14,773,380
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 397,759
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 177,067
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 180,406
<AVERAGE-NET-ASSETS> 35,253,814
<PER-SHARE-NAV-BEGIN> 10.56
<PER-SHARE-NII> 0.44
<PER-SHARE-GAIN-APPREC> 0.05
<PER-SHARE-DIVIDEND> (0.44)
<PER-SHARE-DISTRIBUTIONS> (0.11)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.50
<EXPENSE-RATIO> 0.51
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0.00
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE ANNUAL REPORT OF AMERICAN CENTURY CAPITAL PORTFOLIOS, INC. AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000746458
<NAME> AMERICAN CENTURY MUNICIPAL TRUST
<SERIES>
<NUMBER> 5
<NAME> ARIZONA INTERMEDIATE-TERM MUNICIPAL
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> MAY-31-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 45,883,204
<INVESTMENTS-AT-VALUE> 46,807,827
<RECEIVABLES> 951,259
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 47,759,086
<PAYABLE-FOR-SECURITIES> 2,019,143
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 330,304
<TOTAL-LIABILITIES> 2,349,447
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 44,366,127
<SHARES-COMMON-STOCK> 4,274,791
<SHARES-COMMON-PRIOR> 3,753,594
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 118,889
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 924,623
<NET-ASSETS> 45,409,639
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,071,713
<OTHER-INCOME> 0
<EXPENSES-NET> (221,221)
<NET-INVESTMENT-INCOME> 1,850,492
<REALIZED-GAINS-CURRENT> 303,577
<APPREC-INCREASE-CURRENT> (307,941)
<NET-CHANGE-FROM-OPS> 1,846,128
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,850,492)
<DISTRIBUTIONS-OF-GAINS> (268,298)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,512,103
<NUMBER-OF-SHARES-REDEEMED> (1,140,362)
<SHARES-REINVESTED> 149,456
<NET-CHANGE-IN-ASSETS> 5,362,303
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 83,610
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 217,624
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 221,221
<AVERAGE-NET-ASSETS> 43,063,897
<PER-SHARE-NAV-BEGIN> 10.67
<PER-SHARE-NII> 0.46
<PER-SHARE-GAIN-APPREC> 0.01
<PER-SHARE-DIVIDEND> (0.46)
<PER-SHARE-DISTRIBUTIONS> (0.06)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.62
<EXPENSE-RATIO> 0.51
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0.00
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE ANNUAL REPORT OF AMERICAN CENTURY CAPITAL PORTFOLIOS, INC. AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000746458
<NAME> AMERICAN CENTURY MUNICIPAL TRUST
<SERIES>
<NUMBER> 7
<NAME> LIMITED-TERM TAX-FREE
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> MAY-31-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 41,928
<INVESTMENTS-AT-VALUE> 42,448
<RECEIVABLES> 641
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 43,089
<PAYABLE-FOR-SECURITIES> 1,023
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 949
<TOTAL-LIABILITIES> 1,972
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 40,495
<SHARES-COMMON-STOCK> 4,056
<SHARES-COMMON-PRIOR> 3,781
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 102
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 520
<NET-ASSETS> 41,117
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,791
<OTHER-INCOME> 0
<EXPENSES-NET> (207)
<NET-INVESTMENT-INCOME> 1,584
<REALIZED-GAINS-CURRENT> 188
<APPREC-INCREASE-CURRENT> (139)
<NET-CHANGE-FROM-OPS> 1,633
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,584)
<DISTRIBUTIONS-OF-GAINS> (138)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,019
<NUMBER-OF-SHARES-REDEEMED> (1,892)
<SHARES-REINVESTED> 147
<NET-CHANGE-IN-ASSETS> 2,707
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (17)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 204
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 207
<AVERAGE-NET-ASSETS> 40,297
<PER-SHARE-NAV-BEGIN> 10.16
<PER-SHARE-NII> 0.40
<PER-SHARE-GAIN-APPREC> 0.01
<PER-SHARE-DIVIDEND> (0.40)
<PER-SHARE-DISTRIBUTIONS> (0.03)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.14
<EXPENSE-RATIO> 0.51
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0.00
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE ANNUAL REPORT OF AMERICAN CENTURY CAPITAL PORTFOLIOS, INC. AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000746458
<NAME> AMERICAN CENTURY MUNICIPAL TRUST
<SERIES>
<NUMBER> 8
<NAME> INTERMEDIATE-TERM TAX-FREE
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> MAY-31-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 143,097
<INVESTMENTS-AT-VALUE> 147,104
<RECEIVABLES> 2,475
<ASSETS-OTHER> 223
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 149,802
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 124
<TOTAL-LIABILITIES> 124
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 145,314
<SHARES-COMMON-STOCK> 14,406
<SHARES-COMMON-PRIOR> 13,103
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 359
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 4,005
<NET-ASSETS> 149,678
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 7,317
<OTHER-INCOME> 0
<EXPENSES-NET> (742)
<NET-INVESTMENT-INCOME> 6,575
<REALIZED-GAINS-CURRENT> 765
<APPREC-INCREASE-CURRENT> (1,787)
<NET-CHANGE-FROM-OPS> 5,553
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6,575)
<DISTRIBUTIONS-OF-GAINS> (1,057)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,768
<NUMBER-OF-SHARES-REDEEMED> (4,060)
<SHARES-REINVESTED> 595
<NET-CHANGE-IN-ASSETS> 11,771
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 57
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 734
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 742
<AVERAGE-NET-ASSETS> 145,389
<PER-SHARE-NAV-BEGIN> 10.52
<PER-SHARE-NII> 0.48
<PER-SHARE-GAIN-APPREC> (0.05)
<PER-SHARE-DIVIDEND> (0.48)
<PER-SHARE-DISTRIBUTIONS> (0.08)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.39
<EXPENSE-RATIO> 0.51
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0.00
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE ANNUAL REPORT OF AMERICAN CENTURY CAPITAL PORTFOLIOS, INC. AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000746458
<NAME> AMERICAN CENTURY MUNICIPAL TRUST
<SERIES>
<NUMBER> 9
<NAME> LONG-TERM TAX-FREE
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> MAY-31-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 111,022
<INVESTMENTS-AT-VALUE> 116,430
<RECEIVABLES> 8,203
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 124,633
<PAYABLE-FOR-SECURITIES> 6,123
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 926
<TOTAL-LIABILITIES> 7,049
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 112,460
<SHARES-COMMON-STOCK> 11,222
<SHARES-COMMON-PRIOR> 10,784
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (278)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5,420
<NET-ASSETS> 117,584
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6,419
<OTHER-INCOME> 0
<EXPENSES-NET> (611)
<NET-INVESTMENT-INCOME> 5,808
<REALIZED-GAINS-CURRENT> 411
<APPREC-INCREASE-CURRENT> (2,257)
<NET-CHANGE-FROM-OPS> 3,962
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (5,832)
<DISTRIBUTIONS-OF-GAINS> (1,980)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,983
<NUMBER-OF-SHARES-REDEEMED> (7,119)
<SHARES-REINVESTED> 574
<NET-CHANGE-IN-ASSETS> 969
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 461
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 604
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 611
<AVERAGE-NET-ASSETS> 119,493
<PER-SHARE-NAV-BEGIN> 10.81
<PER-SHARE-NII> 0.52
<PER-SHARE-GAIN-APPREC> (0.15)
<PER-SHARE-DIVIDEND> (0.52)
<PER-SHARE-DISTRIBUTIONS> (0.18)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.48
<EXPENSE-RATIO> 0.51
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0.00
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE ANNUAL REPORT OF AMERICAN CENTURY CAPITAL PORTFOLIOS, INC. AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000746458
<NAME> AMERICAN CENTURY MUNICIPAL TRUST
<SERIES>
<NUMBER> 10
<NAME> HIGH YIELD MUNICIPAL
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> MAY-31-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 44,331
<INVESTMENTS-AT-VALUE> 44,410
<RECEIVABLES> 1,142
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 45,552
<PAYABLE-FOR-SECURITIES> 3,019
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 465
<TOTAL-LIABILITIES> 3,484
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 41,973
<SHARES-COMMON-STOCK> 4,157,996
<SHARES-COMMON-PRIOR> 1,863,618
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 16
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 79
<NET-ASSETS> 42,068
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,959
<OTHER-INCOME> 0
<EXPENSES-NET> (4)
<NET-INVESTMENT-INCOME> 1,955
<REALIZED-GAINS-CURRENT> 169
<APPREC-INCREASE-CURRENT> (83)
<NET-CHANGE-FROM-OPS> 2,041
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,955)
<DISTRIBUTIONS-OF-GAINS> (136)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,137
<NUMBER-OF-SHARES-REDEEMED> (2,007)
<SHARES-REINVESTED> 164
<NET-CHANGE-IN-ASSETS> 23,280
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (17)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4
<AVERAGE-NET-ASSETS> 36,995
<PER-SHARE-NAV-BEGIN> 10.08
<PER-SHARE-NII> 0.54
<PER-SHARE-GAIN-APPREC> 0.07
<PER-SHARE-DIVIDEND> (0.54)
<PER-SHARE-DISTRIBUTIONS> (0.03)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.12
<EXPENSE-RATIO> 0.01
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0.00
</TABLE>
Report of Independent Accountants
To the Trustees of the
American Century Municipal Trust:
In planning and performing our audits of the financial statements and
financial highlights of the American Century Municipal Trust (comprising the
Arizona Intermediate-Term Municipal Fund, Florida Municipal Money Market Fund,
Florida Intermediate-Term Municipal Fund, Tax-Free Money Market Fund,
Limited-Term Tax-Free Fund, Intermediate-Term Tax-Free Fund, Long-Term Tax-Free
Fund and High-Yield Municipal Fund) (the 'Funds') for the year ended May 31,
1999, we considered its internal control, including control activities for
safeguarding securities, in order to determine our auditing procedures for the
purpose of expressing our opinion on the financial statements and to comply with
the requirements of Form N-SAR, not to provide assurance on internal control.
The management of the Funds is responsible for establishing and maintaining
internal control. In fulfilling this responsibility, estimates and judgments by
management are required to assess the expected benefits and related costs of
controls. Generally, controls that are relevant to an audit pertain to the
entity's objective of preparing financial statements for external purposes that
are fairly presented in conformity with generally accepted accounting
principles. Those controls include the safeguarding of assets against
unauthorized acquisition, use or disposition.
Because of inherent limitations in internal control, errors or fraud may
occur and not be detected. Also, projection of any evaluation of internal
control to future periods is subject to the risk that it may become inadequate
because of changes in conditions or that the effectiveness of the design and
operation may deteriorate.
Our consideration of internal control would not necessarily disclose all
matters in internal control that might be material weaknesses under standards
established by the American Institute of Certified Public Accountants. A
material weakness is a condition in which the design or operation of one or more
of the internal control components does not reduce to a relatively low level the
risk that misstatements caused by error or fraud in amounts that would be
material in relation to the financial statements being audited may occur and not
be detected within a timely period by employees in the normal course of
performing their assigned functions. However, we noted no matters involving
internal control and its operation, including controls for safeguarding
securities, that we consider to be material weaknesses as defined above as of
May 31, 1999.
This report is intended solely for the information and use of management
and the Securities and Exchange Commission.
July 12, 1999
