Washington County is a county located in the northeastern part of the U.S. state of Oklahoma. As of the 2020 census, the population was 52,455. Its county seat is Bartlesville. Named for President Geo
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 N
Osage County Courthouse
A view of Tallgrass Prairie Preserve in Osage County, Oklahoma