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      <periodOfReport>06/30/2025</periodOfReport>
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      <reportCalendarYear>2025</reportCalendarYear>
      <reportingPerson>
        <name>BlackRock Municipal Bond Fund, Inc.</name>
        <phoneNumber>800-441-7762</phoneNumber>
        <address>
          <com:street1>100 Bellevue Parkway</com:street1>
          <com:city>Wilmington</com:city>
          <com:stateOrCountry>DE</com:stateOrCountry>
          <com:zipCode>19809</com:zipCode>
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      </reportingPerson>
      <agentForService>
        <name>John Perlowski</name>
        <address>
          <com:street1>50 Hudson Yards</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10001</com:zipCode>
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      <fileNumber>811-02688</fileNumber>
      <explanatoryInformation>
        <explanatoryChoice>Y</explanatoryChoice>
        <explanatoryNotes>On February 7, 2025, BlackRock High Yield Municipal Fund, a fund of BlackRock Municipal Bond Fund, Inc. (the "Non-Surviving Fund") was reorganized into iShares High Yield Muni Active ETF, a series of BlackRock ETF Trust II (Investment Company Act file no. 811-23511, CIK no. 0001804196) (the "Surviving Fund"). The voting record of the Non-Surviving Fund can be found in the Surviving Fund's Form N-PX filing, which was filed on August 28, 2025; BlackRock Short Duration Muni Fund (formerly, BlackRock Short-Term Municipal Fund).</explanatoryNotes>
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          <nameOfSeries>BlackRock National Municipal Fund</nameOfSeries>
          <leiOfSeries>57P6LYFXTWNU9L7GM070</leiOfSeries>
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          <nameOfSeries>BlackRock Short Duration Muni Fund</nameOfSeries>
          <leiOfSeries>5493000K3K76K51JDR40</leiOfSeries>
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          <nameOfSeries>BlackRock High Yield Municipal Fund</nameOfSeries>
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          <nameOfSeries>BlackRock Impact Municipal Fund</nameOfSeries>
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      <reportingPerson>BlackRock Municipal Bond Fund, Inc.</reportingPerson>
      <txSignature>John Perlowski</txSignature>
      <txPrintedSignature>John Perlowski</txPrintedSignature>
      <txTitle>Chief Executive Officer</txTitle>
      <txAsOfDate>08/28/2025</txAsOfDate>
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