| 98851 Adco | 509 | Grant County | Washington (WA) |
| 98851 Adrian | 509 | Grant County | Washington (WA) |
| 99321 Beverly | 509 | Grant County | Washington (WA) |
| 99115 Coulee City | 509 | Grant County | Washington (WA) |
| 99349 Desert Aire | 509 | Grant County | Washington (WA) |
| 99123 Electric City | 509 | Grant County | Washington (WA) |
| 98823 Ephrata | 509 | Grant County | Washington (WA) |
| 98824 George | 509 | Grant County | Washington (WA) |
| 98848 George | 509 | Grant County | Washington (WA) |
| 99133 Grand Coulee | 509 | Grant County | Washington (WA) |
| 99135 Hartline | 509 | Grant County | Washington (WA) |
| 98832 Krupp | 509 | Grant County | Washington (WA) |
| 98851 Lakeview Park | 509 | Grant County | Washington (WA) |
| 98837 Mae | 509 | Grant County | Washington (WA) |
| 98832 Marlin | 509 | Grant County | Washington (WA) |
| 99349 Mattawa | 509 | Grant County | Washington (WA) |
| 98837 Moses Lake | 509 | Grant County | Washington (WA) |
| 98848 Quincy | 509 | Grant County | Washington (WA) |
| 98837 Raugust | 509 | Grant County | Washington (WA) |
| 99357 Royal City | 509 | Grant County | Washington (WA) |
| 98832 Ruff | 509 | Grant County | Washington (WA) |
| 99321 Schawana | 509 | Grant County | Washington (WA) |
| 98851 Soap Lake | 509 | Grant County | Washington (WA) |
| 98853 Stratford | 509 | Grant County | Washington (WA) |
| 98848 Trinidad | 509 | Grant County | Washington (WA) |
| 98857 Warden | 509 | Grant County | Washington (WA) |
| 98837 Wheeler | 509 | Grant County | Washington (WA) |
| 98860 Wilson Creek | 509 | Grant County | Washington (WA) |
| 98848 Winchester | 509 | Grant County | Washington (WA) |