8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 97051 | Saint Helens | 17,589 |
| 97056 | Scappoose | 12,794 |
| 97048 | Rainier | 7,096 |
| 97016 | Clatskanie | 6,568 |
| 97064 | Vernonia | 3,730 |
| 97053 | Warren | 3,401 |
| 97018 | Columbia City | 1,806 |
| 97054 | Deer Island | 1,404 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Columbia County, Oregon (US Census).