| Locality | Post Code |
|---|---|
| Bates, Grant | 97817 |
| Canyon City, Grant | 97820 |
| Dayville, Grant | 97825 |
| Fox, Grant | 97856 |
| John Day, Grant | 97845 |
| Kimberly, Grant | 97848 |
| Long Creek, Grant | 97856 |
| Monument, Grant | 97864 |
| Mount Vernon, Grant | 97865 |
| Prairie City, Grant | 97869 |
| Ritter, Grant | 97856 |
| Seneca, Grant | 97873 |