Cheyenne is a town in Roger Mills County, Oklahoma, United States. The population was 801 at the 2010 census. It is the county seat of Roger Mills County.
Cheyenne is the location of the Battle of Washita River (also called Battle of the Washita; Washita Battlefield), where George Armstrong Custer’s 7th U.S. Cavalry attacked Black Kettle’s Cheyenne village on the Washita River on November 26, 1868.
During the 1970s Cheyenne and the surrounding area benefited from the natural gas and oil development in the Panhandle-Hugoton field, the largest-volume gas field in the United States, and the world’s largest known source of helium. Between 1973 and 1993 the field produced over eight trillion cubic feet (230,000,000 m³) of gas.