Okla. Stat. tit. 19, § 131.1
To file as a candidate for any county office, one must have been a registered voter within the county for the six-month period immediately preceding the first day of the filing period prescribed by law.
Laws 1973, HB 1038, c. 9, § 2; Amended by Laws 1975, SB 29, c. 69, § 1, emerg. eff. April 18, 1975; Amended by Laws 1981, SB 258, c. 178, § 3, emerg. eff. May 18, 1981.