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      <npx:periodOfReport>06/30/2026</npx:periodOfReport>
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      <npx:yearOrQuarter>YEAR</npx:yearOrQuarter>
      <npx:reportCalendarYear>2026</npx:reportCalendarYear>
      <npx:reportingPerson>
        <npx:name>American Century Municipal Trust</npx:name>
        <npx:phoneNumber>816-531-5575</npx:phoneNumber>
        <npx:address>
          <com:street1>4500 Main Street</com:street1>
          <com:city>Kansas City</com:city>
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        <npx:name>John Pak</npx:name>
        <npx:address>
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          <com:stateOrCountry>MO</com:stateOrCountry>
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          <npx:nameOfSeries>Tax-Free Money Market Fund</npx:nameOfSeries>
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          <npx:nameOfSeries>Intermediate-Term Tax-Free Bond Fund</npx:nameOfSeries>
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          <npx:nameOfSeries>High-Yield Municipal Fund</npx:nameOfSeries>
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    <npx:signaturePage>
      <npx:reportingPerson>American Century Municipal Trust</npx:reportingPerson>
      <npx:txSignature>Patrick Bannigan</npx:txSignature>
      <npx:txPrintedSignature>Patrick Bannigan</npx:txPrintedSignature>
      <npx:txTitle>President</npx:txTitle>
      <npx:txAsOfDate>08/26/2026</npx:txAsOfDate>
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