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        <name>Sales Tax Securitization Corp.</name>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2034-12-01</maturityDt>
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        <name>Puerto Rico Electric Power Authority</name>
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          <isin value="US74526QPR73"/>
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        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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        <name>Massachusetts Water Resources Authority</name>
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          <maturityDt>2029-08-01</maturityDt>
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        <name>Massachusetts Development Finance Agency</name>
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        <name>Puerto Rico Electric Power Authority</name>
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        <name>Massachusetts Development Finance Agency</name>
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        <name>Massachusetts State College Building Authority</name>
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        <name>Railsplitter Tobacco Settlement Authority</name>
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        <name>Buckeye Tobacco Settlement Financing Authority</name>
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        <name>Massachusetts Development Finance Agency</name>
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        <name>Massachusetts Development Finance Agency</name>
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        <name>Metropolitan Boston Transit Parking Corp.</name>
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        <name>Massachusetts Development Finance Agency</name>
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      <invstOrSec>
        <name>Massachusetts Port Authority</name>
        <lei>254900JRR8IDSSKWCL90</lei>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Puerto Rico Sales Tax Financing Corp.</name>
        <lei>N/A</lei>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2024-07-01</maturityDt>
          <couponKind>None</couponKind>
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        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2035-12-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Puerto Rico Convention Center District Authority</name>
        <lei>N/A</lei>
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        <fairValLevel>2</fairValLevel>
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        <name>Massachusetts Educational Financing Authority</name>
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        <name>Massachusetts Port Authority</name>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Maryland Stadium Authority</name>
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          <maturityDt>2047-05-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Massachusetts Clean Water Trust (The)</name>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2039-08-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Puerto Rico Highway &amp; Transportation Authority</name>
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          <isin value="US745190N207"/>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2038-07-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Sales Tax Securitization Corp.</name>
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        <name>San Marcos Unified School District</name>
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        <name>Puerto Rico Public Buildings Authority</name>
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        <name>Massachusetts Bay Transportation Authority</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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        <name>Puerto Rico Electric Power Authority</name>
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        <name>Massachusetts Housing Finance Agency</name>
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        <name>University of Massachusetts Building Authority</name>
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        <name>Tennessee Energy Acquisition Corp.</name>
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        <curCd>USD</curCd>
        <valUSD>417607.65000000</valUSD>
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          <maturityDt>2021-09-01</maturityDt>
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          <annualizedRt>5.25000000</annualizedRt>
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        <name>Escambia County Health Facilities Authority</name>
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        <fairValLevel>2</fairValLevel>
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        <name>Puerto Rico Electric Power Authority</name>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2029-07-01</maturityDt>
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        <name>Tennessee Energy Acquisition Corp.</name>
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        <fairValLevel>2</fairValLevel>
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        <name>Puerto Rico Highway &amp; Transportation Authority</name>
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          <maturityDt>2041-07-01</maturityDt>
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        <name>Massachusetts Clean Water Trust (The)</name>
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        <name>Massachusetts Development Finance Agency</name>
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        <name>Sales Tax Securitization Corp.</name>
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        <name>Tennessee Energy Acquisition Corp.</name>
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        <name>Puerto Rico Commonwealth Aqueduct &amp; Sewer Authority</name>
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        <name>Puerto Rico Infrastructure Financing Authority</name>
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        <name>University of Massachusetts Building Authority</name>
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        <name>Sales Tax Securitization Corp.</name>
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        <name>Massachusetts Development Finance Agency</name>
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        <name>Massachusetts Development Finance Agency</name>
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        <name>Pinellas County Educational Facilities Authority</name>
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          <couponKind>Fixed</couponKind>
          <annualizedRt>6.37500000</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>Massachusetts Bay Transportation Authority</name>
        <lei>549300D2U0XBUXGX8P68</lei>
        <title>Massachusetts Bay Transportation Authority</title>
        <cusip>575579QA8</cusip>
        <identifiers>
          <isin value="US575579QA85"/>
        </identifiers>
        <balance>1850000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>2440890.00000000</valUSD>
        <pctVal>0.681196854643</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2029-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</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>Jefferson Parish Hospital Service District No. 2</name>
        <lei>N/A</lei>
        <title>Jefferson Parish Hospital Service District No. 2</title>
        <cusip>474702CZ8</cusip>
        <identifiers>
          <isin value="US474702CZ88"/>
        </identifiers>
        <balance>345000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>352662.45000000</valUSD>
        <pctVal>0.098420064685</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2041-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>6.37500000</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>New Jersey Building Authority</name>
        <lei>549300YJLPPJFRLYB368</lei>
        <title>New Jersey Building Authority</title>
        <cusip>645771ZN9</cusip>
        <identifiers>
          <isin value="US645771ZN94"/>
        </identifiers>
        <balance>45000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>49975.65000000</valUSD>
        <pctVal>0.013947066680</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2029-06-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</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>Massachusetts Development Finance Agency</name>
        <lei>549300UZSVMFXJK08K70</lei>
        <title>Massachusetts Development Finance Agency</title>
        <cusip>57584YVA4</cusip>
        <identifiers>
          <isin value="US57584YVA45"/>
        </identifiers>
        <balance>150000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>187813.50000000</valUSD>
        <pctVal>0.052414474007</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2033-12-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</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>Massachusetts Development Finance Agency</name>
        <lei>549300UZSVMFXJK08K70</lei>
        <title>Massachusetts Development Finance Agency</title>
        <cusip>57584XQ87</cusip>
        <identifiers>
          <isin value="US57584XQ870"/>
        </identifiers>
        <balance>3000000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>3211560.00000000</valUSD>
        <pctVal>0.896273314446</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2047-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</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>Massachusetts Water Resources Authority</name>
        <lei>549300GBS2G3YGHOYO19</lei>
        <title>Massachusetts Water Resources Authority</title>
        <cusip>576049W48</cusip>
        <identifiers>
          <isin value="US576049W481"/>
        </identifiers>
        <balance>1625000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>2219018.75000000</valUSD>
        <pctVal>0.619277637622</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2031-08-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</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>Massachusetts Development Finance Agency</name>
        <lei>549300UZSVMFXJK08K70</lei>
        <title>Massachusetts Development Finance Agency</title>
        <cusip>57584YWG0</cusip>
        <identifiers>
          <isin value="US57584YWG06"/>
        </identifiers>
        <balance>485000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>504535.80000000</valUSD>
        <pctVal>0.140804460674</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2042-12-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>4.00000000</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>Massachusetts State College Building Authority</name>
        <lei>N/A</lei>
        <title>Massachusetts State College Building Authority</title>
        <cusip>575832XD7</cusip>
        <identifiers>
          <isin value="US575832XD78"/>
        </identifiers>
        <balance>760000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>836592.80000000</valUSD>
        <pctVal>0.233474013158</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2032-05-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</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>2020-04-30</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>
