First National (FXNC) 10-K 2016 FY Annual report

Exhibit 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350

In connection with the Annual Report on Form10-K of First National Corporation for the year ended December 31, 2016, I, M. Shane Bell, Executive Vice President and Chief Financial Officer of First National Corporation, hereby certify pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge and belief, that:

(1) such Form10-K for the year ended December 31, 2016, 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 Form10-K for the year ended December 31, 2016, fairly presents, in all material respects, the financial condition and results of operations of First National Corporation.

	/s/ M. Shane Bell
Date: March 29, 2017	Executive Vice President and Chief Financial Officer