Okanogan County, Washington

Okanogan County
Okanogan County Courthouse in Okanogan
Location within the U.S. state of Washington
Washington's location within the U.S.
Coordinates: 48°32′54″N 119°44′32″W / 48.54833°N 119.74222°W / 48.54833; -119.74222
Country United States
State Washington
FoundedFebruary 2, 1888
Named afterFort Okanogan
SeatOkanogan
Largest cityOmak
Area
  Total
5,312.7 sq mi (13,760 km2)
  Land5,266.2 sq mi (13,639 km2)
  Water46.5 sq mi (120 km2)  0.9%
Population
 (2020)
  Total
42,104
  Estimate 
(2024)
44,942
  Density8.3/sq mi (3.2/km2)
Time zoneUTC−8 (Pacific)
  Summer (DST)UTC−7 (PDT)
Congressional district4th
Websiteokanogancounty.org

Okanogan County (/ˌkəˈnɑːɡən/) is a county located in the U.S. state of Washington along the Canada–U.S. border. As of the 2020 census, the population was 42,104. The county seat is Okanogan, while the most populous city is Omak. It is the largest county by area in the state.

About a fifth of the county's residents live in the Greater Omak Area. The county forms a portion of the Okanogan Country. The first county seat was Ruby, which has now been a ghost town for more than 100 years.

Okanogan County was formed out of Stevens County in February 1888. The name derives from the Okanagan language place name ukʷnaqín. The name Okanogan (Okanagan) also refers to a part of southern British Columbia.