Greer county is located in southwestern Oklahoma with Mangum serving as the county seat.

The history of the county begins with its creation in 1860 from a part of Young county, Texas. In 1886, after border disputes with Texas, a full slate of officers was installed but it wasn't until 1896 that the county was finally separated from the Lone Star state by order of the United States Supreme Court.

One of the major attractions of the county is Quartz Mountain State Park which is located on the western shores of Lake Altus-Lugert. The lake is fed from the north by the North Fork of the Red River and together form the entire eastern county line with Kiowa County.

For museum buffs, the Old Greer County Museum in Mangum will be of interest. In addition, the Mangum Armory and the Mangum Community Building have been declared "historic."