Any county in this state with a population of less than five hundred fifty thousand (550,000), according to the latest Federal Decennial Census, which contains a metropolitan area with a population of two hundred fifty thousand (250,000) or more, according to the latest Federal Decennial Census, may adopt or amend a County Home Rule Charter for county government which specifies those powers appropriate for said government and which are not inconsistent with the Oklahoma Constitution and laws of this state.
Okla. Stat. tit. 19, § 8.2