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      <issuerName>PACKAGING CORP OF AMERICA</issuerName>
      <secFileNumber>001-15399</secFileNumber>
      <issuerAddress>
        <com:street1>1955 W FIELD CT</com:street1>
        <com:city>LAKE FOREST</com:city>
        <com:stateOrCountry>IL</com:stateOrCountry>
        <com:zipCode>60045</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>8474823000</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Hassfurther Thomas A</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
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    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab Corporation</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>34552</noOfUnitsSold>
      <aggregateMarketValue>5942944.00</aggregateMarketValue>
      <noOfUnitsOutstanding>89624297</noOfUnitsOutstanding>
      <approxSaleDate>01/26/2024</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>06/23/2018</acquiredDate>
      <natureOfAcquisitionTransaction>Employee Compensation</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>34552</amountOfSecuritiesAcquired>
      <paymentDate>06/23/2018</paymentDate>
      <natureOfPayment>Employee Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <remarks>All shares were acquired via Employee Compensation between 06/23/2018 - 07/22/2022 Sale to be done in THOMAS A HASSFURTHER TRUST</remarks>
    <noticeSignature>
      <noticeDate>01/26/2024</noticeDate>
      <signature>THOMAS A HASSFURTHER TTEE THOMAS HASSFURTHER TRUST</signature>
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144
0001318252
XXXXXXXX
LIVE
0000075677
PACKAGING CORP OF AMERICA
001-15399
1955 W FIELD CT
LAKE FOREST
IL
60045
8474823000
Hassfurther Thomas A
Officer
Common
Charles Schwab Corporation
3000 Schwab Way
Westlake
TX
76262
34552
5942944.00
89624297
01/26/2024
NYSE
Common
06/23/2018
Employee Compensation
Issuer
N
34552
06/23/2018
Employee Compensation
Y
All shares were acquired via Employee Compensation between 06/23/2018 - 07/22/2022 Sale to be done in THOMAS A HASSFURTHER TRUST
01/26/2024
THOMAS A HASSFURTHER TTEE THOMAS HASSFURTHER TRUST