Founded in 1881, Garfield County is one of 39 counties in the state of Washington. Historically, Garfield County was formed from Columbia County. The city of Pomeroy is the county seat. With FIPS code of 23, Garfield County has a population of 2,286 and area of 710 square miles (1,839 km2).
List of all cities in Garfield County, WA alphabetically
| City/Town | Postal Code | Area Code |
| Pomeroy, WA | 99347 | 509 |