Washington County, Oklahoma
| Washington County, Oklahoma | |
|---|---|
 Location in the U.S. state of 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 |
Coordinates: 36°44′50″N 95°58′50″W / 36.747206°N 95.980597°W
Washington County is a county located in the northeastern part of the U.S. state of Oklahoma. As of the 2010 census, the population was 50,976. 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.
The Osage ceded their land claims in 1825, and the Federal Government allowed the Western Cherokee to settle in this area in 1828. The 1835 Treaty of New Echota confirmed Cherokee ownership of the land. The area now covered by Washington County was part of the Cherokee Saline District between 1840 and 1856 and the Cooweescoowee District from 1856 to 1906.
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