14 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 98837 | Moses Lake | 49,455 |
| 98848 | Quincy | 12,854 |
| 98823 | Ephrata | 12,188 |
| 99349 | Mattawa | 8,143 |
| 98851 | Soap Lake | 4,437 |
| 98857 | Warden | 4,062 |
| 99357 | Royal City | 3,843 |
| 99321 | Beverly | 1,047 |
| 99123 | Electric City | 977 |
| 99135 | Hartline | 395 |
| 98860 | Wilson Creek | 277 |
| 98824 | George | 147 |
| 98832 | Marlin | 87 |
| 98853 | Stratford | 6 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 14 ZCTAs in Grant County, Washington (US Census).