Founded in 1883, Adams County is one of 39 counties in the state of Washington. Historically, Adams County was formed from Whitman County. The city of Ritzville is the county seat. With FIPS code of 1, Adams County has a population of 20,613 and area of 1,925 square miles (4,986 km2).
List of all cities in Adams County, WA alphabetically
| City/Town | Postal Code | Area Code |
| Benge, WA | 99105 | 509 |
| Hatton, WA | 99344 | 509 |
| Lind, WA | 99341 | 509 |
| Othello, WA | 99344 | 509 |
| Ritzville, WA | 99169 | 509 |
| Royal Slope, WA | 99344 | 509 |
| Washtucna, WA | 99371 | 509 |