Post Offices List in Morrow County, Oregon:
| Boardman Post Office | 200 Nw 1st St, Boardman, OR 97818 |
| Heppner Post Office | 167 N Main St, Heppner, OR 97836 |
| Ione Post Office | 180 W Main St, Ione, OR 97843 |
| Irrigon Post Office | 300 Ne Main Ave, Irrigon, OR 97844 |
| Lexington Post Office | 320 E Main St, Lexington, OR 97839 |