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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2046-12-01</maturityDt>
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        <name>Massachusetts Educational Financing Authority</name>
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        <name>Puerto Rico Industrial Tourist Educational Medical &amp; Environmental Control Facilities Financing Authority</name>
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        <name>Massachusetts Development Finance Agency</name>
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        <fairValLevel>2</fairValLevel>
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        <name>California Health Facilities Financing Authority</name>
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        <name>Massachusetts Water Resources Authority</name>
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        <name>Puerto Rico Electric Power Authority</name>
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        <name>Massachusetts Port Authority</name>
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        <name>Massachusetts Port Authority</name>
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        <name>Harris County Cultural Education Facilities Finance Corp.</name>
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        <name>Massachusetts Development Finance Agency</name>
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        <name>New York Liberty Development Corp.</name>
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        <curCd>USD</curCd>
        <valUSD>45156.25000000</valUSD>
        <pctVal>0.011128074366</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2024-07-01</maturityDt>
          <couponKind>None</couponKind>
          <annualizedRt>0.00000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Commonwealth of Puerto Rico</name>
        <lei>549300X44HXPLJU48U63</lei>
        <title>Commonwealth of Puerto Rico</title>
        <cusip>74514L3J4</cusip>
        <identifiers>
          <isin value="US74514L3J47"/>
        </identifiers>
        <balance>343525.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>364295.24000000</valUSD>
        <pctVal>0.089775048238</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2031-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.75000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="All applicable monthly total returns are reported excluding any sales loads or redemption fees for Item B.5." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2023-05-01</ncom:dateSigned>
      <ncom:nameOfApplicant>MFS Municipal Series Trust</ncom:nameOfApplicant>
      <ncom:signature>Kasey Phillips</ncom:signature>
      <ncom:signerName>Kasey Phillips</ncom:signerName>
      <ncom:title>Assistant Treasurer</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
