| Zip Code | City | Population ↓ |
|---|---|---|
| 98837 | Moses Lake | 46,959 |
| 98848 | Quincy | 12,959 |
| 98823 | Ephrata | 12,638 |
| 99349 | Mattawa | 7,531 |
| 98851 | Soap Lake | 5,196 |
| 99357 | Royal City | 3,973 |
| 98857 | Warden | 3,545 |
| 99123 | Electric City | 852 |
| 99321 | Beverly | 851 |
| 99135 | Hartline | 452 |
| 98824 | George | 231 |
| 98860 | Wilson Creek | 229 |
| 98832 | Marlin | 153 |
| 98853 | Stratford | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 14 ZCTAs in Grant County, Washington (US Census).