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    <filerInfo>
      <registrantType>RMIC</registrantType>
      <liveTestFlag>LIVE</liveTestFlag>
      <filer>
        <issuerCredentials>
          <cik>0000737800</cik>
          <ccc>XXXXXXXX</ccc>
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      <flags>
        <overrideInternetFlag>false</overrideInternetFlag>
        <confirmingCopyFlag>false</confirmingCopyFlag>
      </flags>
      <investmentCompanyType>N-1A</investmentCompanyType>
      <periodOfReport>06/30/2026</periodOfReport>
    </filerInfo>
    <seriesClass>
      <reportSeriesClass>
        <rptIncludeAllSeriesFlag>true</rptIncludeAllSeriesFlag>
      </reportSeriesClass>
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    <coverPage>
      <yearOrQuarter>YEAR</yearOrQuarter>
      <reportCalendarYear>2026</reportCalendarYear>
      <reportingPerson>
        <name>LORD ABBETT MUNICIPAL INCOME FUND INC</name>
        <phoneNumber>888-522-2388</phoneNumber>
        <address>
          <com:street1>30 Hudson Street</com:street1>
          <com:city>Jersey City</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07302-4804</com:zipCode>
        </address>
      </reportingPerson>
      <agentForService>
        <name>Brooke A. Fapohunda, Esq.</name>
        <address>
          <com:street1>30 Hudson Street</com:street1>
          <com:city>Jersey City</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07302-4804</com:zipCode>
        </address>
      </agentForService>
      <reportInfo>
        <reportType>FUND NOTICE REPORT</reportType>
      </reportInfo>
      <fileNumber>811-03942</fileNumber>
      <leiNumber>549300XUEL89M6K51F43</leiNumber>
      <explanatoryInformation>
        <explanatoryChoice>Y</explanatoryChoice>
        <explanatoryNotes>There is no proxy voting activity for the fund, as the fund did not hold any votable positions during the reporting period.</explanatoryNotes>
      </explanatoryInformation>
    </coverPage>
    <seriesPage>
      <seriesCount>8</seriesCount>
      <seriesDetails>
        <seriesReports>
          <idOfSeries>S000007531</idOfSeries>
          <nameOfSeries>Lord Abbett California Tax Free Fund</nameOfSeries>
          <leiOfSeries>UQF03L01R4PEFAG87320</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000007537</idOfSeries>
          <nameOfSeries>Lord Abbett National Tax Free Fund</nameOfSeries>
          <leiOfSeries>PRC1FLSEOTHPTH5GWH03</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000007538</idOfSeries>
          <nameOfSeries>Lord Abbett New Jersey Tax Free Fund</nameOfSeries>
          <leiOfSeries>U1PX4M4F5WIL6YZEDE72</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000007539</idOfSeries>
          <nameOfSeries>Lord Abbett New York Tax Free Fund</nameOfSeries>
          <leiOfSeries>TJ0JHUJX8UEYQR7MMK22</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000031145</idOfSeries>
          <nameOfSeries>Lord Abbett High Income Municipal Bond Fund</nameOfSeries>
          <leiOfSeries>549300XBQ63BWZERTS64</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000031146</idOfSeries>
          <nameOfSeries>Lord Abbett Intermediate Tax Free Fund</nameOfSeries>
          <leiOfSeries>1ESF2MKJNZCXVII40K46</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000031147</idOfSeries>
          <nameOfSeries>Lord Abbett Short Duration Tax Free Fund</nameOfSeries>
          <leiOfSeries>5493004CYGOVBLTVOT08</leiOfSeries>
        </seriesReports>
        <seriesReports>
          <idOfSeries>S000049302</idOfSeries>
          <nameOfSeries>Lord Abbett Short Duration High Income Municipal Bond Fund</nameOfSeries>
          <leiOfSeries>549300RUF1L7IQC6RI64</leiOfSeries>
        </seriesReports>
      </seriesDetails>
    </seriesPage>
    <signaturePage>
      <reportingPerson>LORD ABBETT MUNICIPAL INCOME FUND INC</reportingPerson>
      <txSignature>Gina Andes</txSignature>
      <txPrintedSignature>Gina Andes</txPrintedSignature>
      <txTitle>Interim Principal Financial Officer and Assistant Treasurer</txTitle>
      <txAsOfDate>08/26/2026</txAsOfDate>
    </signaturePage>
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