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 Annual Report of the Company on Form 10-K/A for the year ended December 31, 2004 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, Chief Financial
Officer and Corporate Secretary

March 31, 2005