Okla. Stat. tit. 43, § 43-4
License required
No person shall enter into or contract the marriage relation,
nor shall any person perform or solemnize the ceremony of any
marriage in this state without a license being first issued by the
Oklahoma Statutes - Title 43. Marriage and Family Page 10
judge or clerk of the district court, of some county in this state,
authorizing the marriage between the persons named in such license.