Okla. Stat. tit. 19, § 941

In any county in the State of Oklahoma, the board of commissioners of each county of the state is hereby authorized in its discretion, by the adoption of a resolution to set forth in its minutes, to install and operate on any tract of land of the county not needed or used for other county purposes county parking lots on which motor and other vehicles may be parked, and may charge parking fees therefor, and may install parking meters or other parking control devices, all as provided for and fixed in said resolution.