Washington County, Oklahoma

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Washington County, Oklahoma
Old Washington County Courthouse Bartlesville.JPG
Map of Oklahoma highlighting Washington County
Location in the U.S. state of Oklahoma
Map of the United States highlighting Oklahoma
Oklahoma's location in the U.S.
Founded 1907
Named for George Washington
Seat Bartlesville
Largest city Bartlesville
Area
 • Total 424 sq mi (1,098 km2)
 • Land 415 sq mi (1,075 km2)
 • Water 8.8 sq mi (23 km2), 2.1%
Population (est.)
 • (2013) 51,577
 • Density 123/sq mi (47/km2)
Congressional district 1st
Website www.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.