| Post Office | Boardman |
| Division | Morrow |
| Pincode | 97818 |
| Post Office | Irrigon |
| Division | Morrow |
| Pincode | 97844 |
| Post Office | Heppner |
| Division | Morrow |
| Pincode | 97836 |
| Post Office | Ione |
| Division | Morrow |
| Pincode | 97843 |
| Post Office | Lexington |
| Division | Morrow |
| Pincode | 97839 |
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