Exhibit 99.1 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 Quarterly Report of United Security Bancshares, Inc. ("Bancshares") on Form 10-Q for the period ended June 30, 2002 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, R. Terry Phillips, President and Chief Executive Officer of Bancshares, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge: (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 Bancshares. /s/ R. Terry Phillips R. Terry Phillips 	President and Chief Executive Officer 	August 13, 2002