content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
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      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001351689</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001057352</issuerCik>
        <issuerName>COSTAR GROUP, INC.</issuerName>
        <secFileNumber>000-24531</secFileNumber>
        <issuerAddress>
          <com:street1>1331 L STREET, NW</com:street1>
          <com:city>WASHINGTON</com:city>
          <com:stateOrCountry>DC</com:stateOrCountry>
          <com:zipCode>20005</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>2023466500</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Hill John W</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Director</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Ameritas Investment Corp</name>
          <address>
            <com:street1>5900 O Street</com:street1>
            <com:city>Lincoln</com:city>
            <com:stateOrCountry>NE</com:stateOrCountry>
            <com:zipCode>68501</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>1325</noOfUnitsSold>
        <aggregateMarketValue>103000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>409816848</noOfUnitsOutstanding>
        <approxSaleDate>07/30/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/15/2023</acquiredDate>
        <natureOfAcquisitionTransaction>payment for services rendered</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Costar</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>203</amountOfSecuritiesAcquired>
        <paymentDate>09/15/2023</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/14/2015</acquiredDate>
        <natureOfAcquisitionTransaction>payment for services rendered</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Costar</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1122</amountOfSecuritiesAcquired>
        <paymentDate>09/14/2015</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>07/30/2024</noticeDate>
        <signature>/s/ Audrey Skillern as a duly authorized representative of National Financial Services LLC, as attorney-in-fact for John Hill</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
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text: 144
  0001351689
  XXXXXXXX
  LIVE
  0001057352
  COSTAR GROUP, INC.
  000-24531
  1331 L STREET, NW
  WASHINGTON
  DC
  20005
  2023466500
  Hill John W
  Director
  Common
  Ameritas Investment Corp
  5900 O Street
  Lincoln
  NE
  68501
  1325
  103000.00
  409816848
  07/30/2024
  NASDAQ
  Common
  09/15/2023
  payment for services rendered
  Costar
  N
  203
  09/15/2023
  compensation
  Common
  09/14/2015
  payment for services rendered
  Costar
  N
  1122
  09/14/2015
  compensation
  Y
  07/30/2024
  /s/ Audrey Skillern as a duly authorized representative of National Financial Services LLC, as attorney-in-fact for John Hill