Washington County, Oklahoma

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Washington County, Oklahoma
Old Washington County Courthouse Bartlesville.JPG
Location within Oklahoma
Location within Oklahoma
Map of the United States highlighting Oklahoma
Oklahoma's location within the U.S.
Founded1907
Named forGeorge Washington
SeatBartlesville
Largest cityBartlesville
Area
 • Total424 sq mi (1,098 km2)
 • Land415 sq mi (1,075 km2)
 • Water8.8 sq mi (23 km2), 2.1%
Population (est.)
 • (2013)51,577
 • Density123/sq mi (47/km2)
Congressional district1st
Websitewww.countycourthouse.org

Washington County is a county in the U.S. state of Oklahoma. It is, in area, the third smallest county in Oklahoma. As of 2000, 48,996 people lived there. Its county seat is Bartlesville.