Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of MidWestOne Financial Group, Inc. on Form 10-K for the period ended December 31, 2008 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gary J. Ortale, the Senior Vice President and Interim Chief Financial Officer of MidWestOne Financial Group, Inc., certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(a)           The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b)           The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of MidWestOne Financial Group, Inc.

/s/ Gary J. Ortale

Gary J. Ortale

Sr. VP and Interim Chief Financial Officer

Dated: March 16, 2009

This certification accompanies this Form 10-K and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liability of that Section.