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                    <ns2:ccc>XXXXXXXX</ns2:ccc>
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            <ns2:liveTestFlag>LIVE</ns2:liveTestFlag>



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            <ns2:issuerName>Packaging Corporation of America</ns2:issuerName>
            <ns2:secFileNumber>001-15399</ns2:secFileNumber>
            <ns2:issuerAddress>
                <com:street1>1 North Field Court</com:street1>
                <com:city>Lake Forest</com:city>
                <com:stateOrCountry>IL</com:stateOrCountry>
                <com:zipCode>60045</com:zipCode>
            </ns2:issuerAddress>
            <ns2:issuerContactPhone>1-800-456-4725</ns2:issuerContactPhone>
            <ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Paul Stecko</ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <ns2:relationshipsToIssuer>
                <ns2:relationshipToIssuer>Director</ns2:relationshipToIssuer>
            </ns2:relationshipsToIssuer>
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        <ns2:securitiesInformation>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:brokerOrMarketmakerDetails>
                <ns2:name>Goldman Sachs &amp; Co. LLC</ns2:name>
                <ns2:address>
                    <com:street1>200 West Street</com:street1>
                    <com:city>New York</com:city>
                    <com:stateOrCountry>NY</com:stateOrCountry>
                    <com:zipCode>10282</com:zipCode>
                </ns2:address>
            </ns2:brokerOrMarketmakerDetails>
            <ns2:noOfUnitsSold>10500</ns2:noOfUnitsSold>
            <ns2:aggregateMarketValue>2575650</ns2:aggregateMarketValue>
            <ns2:noOfUnitsOutstanding>89804942</ns2:noOfUnitsOutstanding>
            <ns2:approxSaleDate>11/21/2024</ns2:approxSaleDate>
            <ns2:securitiesExchangeName>NYSE</ns2:securitiesExchangeName>
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            <ns2:acquiredDate>05/02/2023</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Awards</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Packaging Corporation of America</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>636</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>05/02/2023</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
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        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:acquiredDate>05/08/2024</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Awards</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Packaging Corporation of America</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>616</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>05/08/2024</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common Stock</ns2:securitiesClassTitle>
            <ns2:acquiredDate>06/30/2008</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Acquired as compensation -- Restricted Stock Units</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Packaging Corporation of America</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>N</ns2:isGiftTransaction>
            <ns2:amountOfSecuritiesAcquired>9248</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>06/30/2008</ns2:paymentDate>
            <ns2:natureOfPayment>Compensation</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <ns2:noticeSignature>
            <ns2:noticeDate>11/21/2024</ns2:noticeDate>
            <ns2:planAdoptionDates/>
            <ns2:signature>Goldman Sachs &amp; Co. LLC on behalf of Paul Stecko</ns2:signature>
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144
0001239789
XXXXXXXX
LIVE
0000075677
Packaging Corporation of America
001-15399
1 North Field Court
Lake Forest
IL
60045
1-800-456-4725
Paul Stecko
Director
Common Stock
Goldman Sachs & Co. LLC
200 West Street
New York
NY
10282
10500
2575650
89804942
11/21/2024
NYSE
Common Stock
05/02/2023
Acquired as compensation -- Restricted Stock Awards
Packaging Corporation of America
N
636
05/02/2023
Compensation
Common Stock
05/08/2024
Acquired as compensation -- Restricted Stock Awards
Packaging Corporation of America
N
616
05/08/2024
Compensation
Common Stock
06/30/2008
Acquired as compensation -- Restricted Stock Units
Packaging Corporation of America
N
9248
06/30/2008
Compensation
Y
11/21/2024
Goldman Sachs & Co. LLC on behalf of Paul Stecko