Post Offices List in Seaside City, Oregon:
| Seaside Post Office | 300 Avenue A, Seaside, OR 97138 |
| Gearhart Post Office | 546 Pacific Way, Seaside, OR 97138 |
| Seaside Post Office | 300 Avenue A, Seaside, OR 97138 |
| Gearhart Post Office | 546 Pacific Way, Seaside, OR 97138 |