| ZIP Code | ZIP Code Place Name | County | ZIP Code Type |
|---|---|---|---|
| 98823 | Ephrata | Grant County | Standard |
| 98824 | George | Grant County | PO Box |
| 98832 | Marlin | Grant County | Standard |
| 98837 | Moses Lake | Grant County | Standard |
| 98848 | Quincy | Grant County | Standard |
| 98851 | Soap Lake | Grant County | Standard |
| 98853 | Stratford | Grant County | PO Box |
| 98857 | Warden | Grant County | Standard |
| 98860 | Wilson Creek | Grant County | PO Box |
| 99103 | Almira | Lincoln County | Standard |
| 99115 | Coulee City | Douglas County | Standard |
| 99123 | Electric City | Grant County | Standard |
| 99133 | Grand Coulee | Douglas County | Standard |
| 99135 | Hartline | Grant County | Standard |
| 99321 | Beverly | Grant County | Standard |
| 99344 | Othello | Adams County | Standard |
| 99349 | Mattawa | Grant County | Standard |
| 99357 | Royal City | Grant County | Standard |