S. and W. of North Fork of Red R. Greer Co. was named and governed as part of Texas from 1806 until 1896 when U.S. Supreme Crt. decision made it part of Oklahoma Ter. This county area was claimed by 14 different governments from 1669 to Oklahoma statehood in 1907; since then it has been divided into 3 counties and the south part of Beckham County.