Cimarron county, formed in 1907 from the western portion of Beaver county, is located in the Panhandle region of Oklahoma and is the state's westernmost county. The county seat is Boise City
The county is historically noted as cattle country as evidenced by the old "Santa Fe Trail" which runs parallel to present-day U.S. Highway 56/64/412.
Outdoor recreation is provided by Lake Etling and Black Mesa State Park near the New Mexico border and the Cimarron River to the north. Black Mesa is Oklahoma's highest point at nearly 5,000 feet elevation.
Among the historical sites in the county are the Bat, Red Ghost and Three Entrance Caves Archaeological Sites near Kenton, the Cold Spring and Inscription Rock Historic District near Boise City and Cedar Breaks Archeological District near Felt.
The county population on July 1, 1999, was 2,922, a decrease of 379 over the 1990 census.