Founded in 1909, Grant County is one of 39 counties in the state of Washington. Historically, Grant County was formed from Douglas County. The city of Ephrata is the county seat. With FIPS code of 25, Grant County has a population of 99,123 and area of 2,680 square miles (6,941 km2).
List of all cities in Grant County, WA alphabetically
| City/Town | Postal Code | Area Code |
| Adco, WA | 98851 | 509 |
| Adrian, WA | 98851 | 509 |
| Beverly, WA | 99321 | 509 |
| Coulee City, WA | 99115 | 509 |
| Desert Aire, WA | 99349 | 509 |
| Electric City, WA | 99123 | 509 |
| Ephrata, WA | 98823 | 509 |
| George, WA | 98824 | 509 |
| 98848 | 509 | |
| Grand Coulee, WA | 99133 | 509 |
| Hartline, WA | 99135 | 509 |
| Krupp, WA | 98832 | 509 |
| Lakeview Park, WA | 98851 | 509 |
| Mae, WA | 98837 | 509 |
| Marlin, WA | 98832 | 509 |
| Mattawa, WA | 99349 | 509 |
| Moses Lake, WA | 98837 | 509 |
| Quincy, WA | 98848 | 509 |
| Raugust, WA | 98837 | 509 |
| Royal City, WA | 99357 | 509 |
| Ruff, WA | 98832 | 509 |
| Schawana, WA | 99321 | 509 |
| Soap Lake, WA | 98851 | 509 |
| Stratford, WA | 98853 | 509 |
| Trinidad, WA | 98848 | 509 |
| Warden, WA | 98857 | 509 |
| Wheeler, WA | 98837 | 509 |
| Wilson Creek, WA | 98860 | 509 |
| Winchester, WA | 98848 | 509 |