Post Offices List in Union County, Ohio:
| Magnetic Springs Post Office | 57 S Main St, Magnetic Springs, OH 43036 |
| Marysville Post Office | 202 N Main St, Marysville, OH 43040 |
| Milford Center Post Office | 21 E State St, Milford Center, OH 43045 |
| Raymond Post Office | 21655 Main St, Raymond, OH 43067 |
| Richwood Post Office | 12 E Ottawa St, Richwood, OH 43344 |
| Unionville Center Post Office | 110 W Main St, Unionville Center, OH 43077 |