Washington County, Oklahoma

36°44′50″N 95°58′50″W / 36.747206°N 95.980597°W / 36.747206; -95.980597

Washington County
Old Washington County Courthouse in Bartlesville
Map of Oklahoma highlighting Washington County
Location within the U.S. state of Oklahoma
Map of the United States highlighting Oklahoma
Oklahoma's location within the U.S.
Coordinates: 36°44′50″N 95°58′50″W / 36.747206°N 95.980597°W / 36.747206; -95.980597
Country United States
State Oklahoma
Founded1907
Named forGeorge Washington
SeatBartlesville
Largest cityBartlesville
Area
 • Total424 sq mi (1,100 km2)
 • Land415 sq mi (1,070 km2)
 • Water8.8 sq mi (23 km2)  2.1%
Population
 (2020)
 • Total52,455 Increase
 • Density120/sq mi (50/km2)
Congressional district2nd
Websitewww.countycourthouse.org

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.[1] Its county seat is Bartlesville.[2] Named for President George Washington, it is the smallest county in Oklahoma in total area,[3] 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.

  1. ^ Cite error: The named reference census was invoked but never defined (see the help page).
  2. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
  3. ^ Jon D. May, "Washington County." Encyclopedia of Oklahoma History and Culture.