EXHIBIT 32.2

         The following certification is provided by the undersigned Senior
Executive Vice President and Principal Financial and Accounting Officer of
UnionBancorp, Inc. on the basis of such officer's knowledge and belief for the
sole purpose of complying with 18 U.S.C. Section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002.

                                  CERTIFICATION
                                  -------------

         In connection with the Quarterly Report of UnionBancorp, Inc. (the
"Company") on Form 10-Q/A for the period ended September 30, 2005 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Kurt R. Stevenson, Senior Executive Vice President and Principal Financial and
Accounting Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section
1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002,
that:

         (1)      The Report fully complies with the requirements of Section
                  13(a) of the Securities Exchange Act of 1934, as amended; and

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


                             /s/ KURT R. STEVENSON
                             ---------------------------------------------------
                             Name:    Kurt R. Stevenson
                             Title:   Senior Executive Vice President and
                                      Principal Financial and Accounting Officer
                             Date:    July 14, 2006