Asotin County, Washington

Asotin County
Asotin County Courthouse
Location within the U.S. state of Washington
Washington's location within the U.S.
Coordinates: 46°11′N 117°11′W / 46.18°N 117.19°W / 46.18; -117.19
Country United States
State Washington
FoundedOctober 27, 1883
Named afterAsotin Creek
SeatAsotin
Largest cityClarkston
Area
  Total
641 sq mi (1,660 km2)
  Land636 sq mi (1,650 km2)
  Water4.4 sq mi (11 km2)  0.7%
Population
 (2020)
  Total
22,285
  Estimate 
(2024)
22,523
  Density35/sq mi (14/km2)
Time zoneUTC−8 (Pacific)
  Summer (DST)UTC−7 (PDT)
Congressional district5th
Websitewww.co.asotin.wa.us

Asotin County (/əˈstən/) is a county in the far southeastern corner of the U.S. state of Washington. As of the 2020 census, the population was 22,285. The county seat is at Asotin, and its largest city is Clarkston. The county was created out of Garfield County in 1883 and derives its name from a Nez Perce word meaning "Eel Creek." Asotin County is part of the Lewiston–Clarkston metropolitan area, which includes Nez Perce County, Idaho, and Asotin County.