Osage County, Oklahoma

Osage County
Osage County Courthouse
Location within the U.S. state of Oklahoma
Oklahoma's location within the U.S.
Coordinates: 36°38′N 96°24′W / 36.63°N 96.4°W / 36.63; -96.4
Country United States
State Oklahoma
Founded1907
Named afterOsage Nation
SeatPawhuska
Largest cityHominy
Area
  Total
2,304 sq mi (5,970 km2)
  Land2,246 sq mi (5,820 km2)
  Water58 sq mi (150 km2)  2.5%
Population
 (2020)
  Total
45,818
  Density20/sq mi (7.7/km2)
Congressional district3rd

Osage County (/ˈs/) 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 as of 2020 was 45,818.