Founded in 1883, Asotin County is one of 39 counties in the state of Washington. Historically, Asotin County was formed from Garfield County. The city of Asotin is the county seat. With FIPS code of 3, Asotin County has a population of 22,285 and area of 636 square miles (1,647 km2).
List of all cities in Asotin County, WA alphabetically
| City/Town | Postal Code | Area Code |
| Anatone, WA | 99401 | 509 |
| Asotin, WA | 99402 | 509 |
| Clarkston, WA | 99403 | 509 |