County · Oklahoma

Washington County

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 George Washington, it is the smallest county in Oklahoma in total area, adjacent to the largest county in Oklahoma, Osage County. Washington County comprises the Bartlesville, OK micropolitan statistical area, which is also included in the Tulsa-Muskogee-Bartlesville, OK combined statistical area. It is located along the border with Kansas.

Governance bodies

Board of County Commissioners Primary
governing council

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Cities and towns 6

Reference data (Census of Governments 2022)

Census ID (PID6): 173354
FIPS state: 40
FIPS county: 147
FIPS place: 99147
Census record name: COUNTY OF WASHINGTON
Mailing address: 400 S JOHNSTONE AVE, BARTLESVILLE 74003