Arkansas Territory
Miller County was a county that existed from April 1, 1820 to 1838, first as part of Arkansas Territory and later the State of Arkansas. It included much of what is southeastern Oklahoma and the northeastern counties in Texas (Bowie, Red River, Lamar, Fannin, Cass, Morris, Titus, Franklin, Hopkins, Delta and Hunt). It was named for James Miller, the first governor of the Arkansas Territory.