| Locality | Post Code |
|---|---|
| Birkenfeld, Columbia | 97016 |
| Clatskanie, Columbia | 97016 |
| Columbia City, Columbia | 97018 |
| Deer Island, Columbia | 97054 |
| Mist, Columbia | 97016 |
| Prescott, Columbia | 97048 |
| Rainier, Columbia | 97048 |
| Saint Helens, Columbia | 97051 |
| Scappoose, Columbia | 97056 |
| Vernonia, Columbia | 97064 |
| Warren, Columbia | 97053 |
| Westport, Columbia | 97016 |