Beaver is a town in and the county seat of Beaver County, Oklahoma, United States. The population was 1,570 at the 2000 census, at which time it was a city; the city became a town in November 2005. It is located on Beaver River, and began as the location of a fur-trading post in 1879. Its original name was Beaver City, and was planned to be the capital of the short-lived Cimarron Territory. In 1890, the territory was assigned to Oklahoma Territory, and Beaver City became the seat for the entire Oklahoma Panhandle, then known as Seventh County. The town is host to the annual World Cow Chip Throwing Championship.