content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001748654</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000723188</issuerCik>
        <issuerName>COMMUNITY FINANCIAL SYSTEM, INC.</issuerName>
        <secFileNumber>001-13695</secFileNumber>
        <issuerAddress>
          <com:street1>5790 WIDEWATERS PKWY</com:street1>
          <com:city>DEWITT</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>13214</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>8007242262</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>SKERRITT SUSAN E</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Recently Retired from Board</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Commonwealth Financial Network</name>
          <address>
            <com:street1>29 Sawyer Rd</com:street1>
            <com:city>Waltham</com:city>
            <com:stateOrCountry>MA</com:stateOrCountry>
            <com:zipCode>02453</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>2619</noOfUnitsSold>
        <aggregateMarketValue>148261.59</aggregateMarketValue>
        <noOfUnitsOutstanding>52851453</noOfUnitsOutstanding>
        <approxSaleDate>06/25/2025</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>06/13/2025</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>CBU</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2619</amountOfSecuritiesAcquired>
        <paymentDate>06/13/2025</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>12/03/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Options Exercise</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>CBU</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>380</amountOfSecuritiesAcquired>
        <paymentDate>12/03/2020</paymentDate>
        <natureOfPayment>cash/check</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Susan Skerritt</name>
          <address>
            <com:street1>5790 Widewaters parkway</com:street1>
            <com:city>Dewitt</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>13214</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>CBU</securitiesClassTitle>
        <saleDate>06/03/2025</saleDate>
        <amountOfSecuritiesSold>380</amountOfSecuritiesSold>
        <grossProceeds>21340.76</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>06/25/2025</noticeDate>
        <signature>Carmen Zamores as a duly authorized representative of National Financial Services LLC, as attorney-in-fact for SKERRITT SUSAN E</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 3946}]
text: 144
  0001748654
  XXXXXXXX
  LIVE
  0000723188
  COMMUNITY FINANCIAL SYSTEM, INC.
  001-13695
  5790 WIDEWATERS PKWY
  DEWITT
  NY
  13214
  8007242262
  SKERRITT SUSAN E
  Recently Retired from Board
  Common
  Commonwealth Financial Network
  29 Sawyer Rd
  Waltham
  MA
  02453
  2619
  148261.59
  52851453
  06/25/2025
  NYSE
  Common
  06/13/2025
  Stock Award
  CBU
  N
  2619
  06/13/2025
  Compensation
  Common
  12/03/2020
  Stock Options Exercise
  CBU
  N
  380
  12/03/2020
  cash/check
  N
  Susan Skerritt
  5790 Widewaters parkway
  Dewitt
  NY
  13214
  CBU
  06/03/2025
  380
  21340.76
  06/25/2025
  Carmen Zamores as a duly authorized representative of National Financial Services LLC, as attorney-in-fact for SKERRITT SUSAN E