Texas county, located in the Panhandle region of Oklahoma, gets its name as being a part of the "Texas Cessation" of 1850. From 1850 to 1890, its lands were never attached to any state or territory, never surveyed, and never divided into townships and sections thereby earning the nickname of "No Man's Land." Guymon serves as the county seat.

The Corrumpa River enters the county from Texas west of Texhoma flowing northeast and then east before emptying into Optima Lake. It emerges from the lake as the Beaver River on its way into Beaver County. Optima National Wildlife Refuge surrounds the lake and provides visitors opportunities to hunt and bird watch, among other activities.

Advanced education can be found at Oklahoma Panhandle State University which is located in Goodwell southwest of Guymon along U.S. Highway 54. Meanwhile, museum buffs will enjoy the No Man's Land Museum, also located in Goodwell.

The county population on July 1, 1999, was 18,329, an increase of 1,910 over the 1990 census.