Primis Financial (FRST) 10-K 2016 FY Annual report

Exhibit 32.1​

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 Southern National Bancorp of Virginia, Inc. (“Southern National”) on Form 10-K for the period ending December 31, 2016 as filed with the Securities and Exchange Commission on the date hereof  (the “Report”), the undersigned Chief Executive Officer and Chief Financial Officer of Southern National hereby certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that based on their knowledge and belief: 1) the Report 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 the Report fairly presents, in all material respects, the financial condition and results of operations of Southern National as of and for the periods covered in the Report.

/s/ Georgia S. Derrico

Georgia S. Derrico, Chief Executive Officer

/s/ William H. Lagos

William H. Lagos, Chief Financial Officer

March 16, 2017