Packaging Corporation of America (PKG) 10-Q 2010 Q3 Quarterly report

Exhibit 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER
PURSUANT TO 18 U.S.C. §1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

     I, Richard B. West, Chief Financial Officer of Packaging Corporation of America (the “Company”), certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

     (1) The Quarterly Report of the Company on Form 10-Q for the period ended September 30, 2010 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

     (2) The information contained in such Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/Richard B. West

Richard B. West

Senior Vice President and Chief Financial Officer

November 3, 2010