11 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 97845 | John Day | 2,265 |
| 97820 | Canyon City | 1,568 |
| 97865 | Mount Vernon | 921 |
| 97869 | Prairie City | 838 |
| 97856 | Long Creek | 485 |
| 97825 | Dayville | 347 |
| 97864 | Monument | 316 |
| 97877 | Sumpter | 314 |
| 97848 | Kimberly | 217 |
| 97873 | Seneca | 109 |
| 97817 | Bates | 13 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 11 ZCTAs in Grant County, Oregon (US Census).