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>0001487699</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000008670</issuerCik>
        <issuerName>AUTOMATIC DATA PROCESSING INC</issuerName>
        <secFileNumber>001-05397</secFileNumber>
        <issuerAddress>
          <com:street1>ONE ADP BOULVARD</com:street1>
          <com:city>ROSELAND</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07068</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>9739745000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Bonarti Michael A</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>900 Salem Street</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>7984</noOfUnitsSold>
        <aggregateMarketValue>2156900.86</aggregateMarketValue>
        <noOfUnitsOutstanding>407795203</noOfUnitsOutstanding>
        <approxSaleDate>08/23/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/23/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Option Granted - 09/01/2019</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>7984</amountOfSecuritiesAcquired>
        <paymentDate>08/23/2024</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>08/23/2024</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>09/06/2023</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ Emily Navaro, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for  Michael A. Bonarti.</signature>
      </noticeSignature>
    </formData>
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text: 144
  0001487699
  XXXXXXXX
  LIVE
  0000008670
  AUTOMATIC DATA PROCESSING INC
  001-05397
  ONE ADP BOULVARD
  ROSELAND
  NJ
  07068
  9739745000
  Bonarti Michael A
  Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  7984
  2156900.86
  407795203
  08/23/2024
  NASDAQ
  Common
  08/23/2024
  Option Granted - 09/01/2019
  Issuer
  N
  7984
  08/23/2024
  Cash
  Y
  08/23/2024
  09/06/2023
  /s/ Emily Navaro, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for  Michael A. Bonarti.