Packaging Corporation of America (PKG) 10-K 2011 FY Annual report

Exhibit 21.1

Subsidiaries of the Registrant

•    Dixie Container Corporation
State of Incorporation:	Virginia
Other trade names used:	Packaging Corporation of Ohio
•    PCA Hydro, Inc.
State of Incorporation:	Delaware
Other trade names used:	None
•    Packaging Corporation of Illinois
State of Incorporation:	Delaware
Other trade names used:	Acorn Corrugated Box Company
•    Packaging Corporation of Chicago
State of Incorporation:	Delaware
Other trade names used:	Elwood Packaging Inc.
•    PCA International, Inc.
State of Incorporation:	Delaware
Other trade names used:	None
•    PCA International Services, LLC
State of Incorporation:	Delaware
Other trade names used:	None
•    PCAI de Mexico S. de R.L. de C.V.
State of Incorporation:	Sonora, Mexico
Other trade names used:	None
•    Packaging Corporation of Asia, Limited
State of Incorporation:	Hong Kong
Other trade names used:	None
•    Packaging Credit Company, LLC
State of Incorporation:	Delaware
Other trade names used:	None
•    Packaging Receivables Company, LLC
State of Incorporation:	Delaware
Other trade names used:	None
•    Midwest Corrugated Packaging Products, LLC
State of Incorporation:	Illinois
Other trade names used:	Field Packaging Group, LLC
•    PCA Alabama Acquisition Corp.
State of Incorporation:	Delaware
Other trade names used:	None
•    PCA Colorado Acquisition Corp.
State of Incorporation:	Delaware
Other trade names used:	None