You can get your marriage license for your weddings in OKC from any county court clerk’s office in Oklahoma. You will normally get it from the county in which you reside. If you are from another state, you will typically obtain this license from the county where you wish to have your weddings in OKC. Your wedding officiant in OKC will need to have your marriage license in hand prior to the date he or she performs weddings in OKC. The website for the Oklahoma County Courthouse.