Exhibit 32.1

CERTIFICATION OF CEO AND CFO PURSUANT TO

18 U.S.C. § 1350,

AS ADOPTED PURSUANT TO

§ 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Form 10-K/A of Security Bank Corporation (the “Company”) for the year ended December 31, 2003 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), H. Averett Walker, Chief Executive Officer of the Company, and James R. McLemore, Chief Financial and Accounting Officer of the Company, each hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxlcy Act of 2002, to the best of his/her knowledge that:

(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 operation of the Company.

/s/ H. Averett Walker

H. AVERETT WALKER

Chief Executive Officer

April 28, 2004

/s/ James R. McLemore

JAMES R. McLEMORE

Chief Financial and Accounting Officer

April 28, 2004

This certification accompanies this Report pursuant to § 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of § 18 of Securities Exchange Act of 1934, as amended.