Washington County, Oklahoma

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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
 • Estimate 
(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.