Osage County

Osage County is the largest county by area in the U.S. state of Oklahoma. Created in 1907 when Oklahoma was admitted as a state, the county is named for and is home to the federally recognized Osage Nation. The county is coextensive with the Osage Nation Reservation, established by treaty in the 19th century when the Osage relocated there from Kansas. The county seat is in Pawhuska, one of the first three towns established in the county. The total population of the county is 47,987.

During the 17th century, the Osage and other Dhegihan Siouan tribes were displaced westward from the Ohio Country following the Beaver Wars. The Osage became established as a powerful nation in the areas of present-day Missouri and Arkansas between the Missouri and Red rivers, as well as extending to the west. By 1760, they had increased their range to include the present Osage County. Historically one of the most powerful Great Plains tribes, their numbers were reduced by infectious disease and warfare after encounter with Europeans.

Wikipedia