Post Offices List in Union County, Iowa:
| Afton Post Office | 208 W Kansas St, Afton, IA 50830 |
| Arispe Post Office | 307 Forbes St, Arispe, IA 50831 |
| Creston Post Office | 300 S Elm St, Creston, IA 50801 |
| Lorimor Post Office | 512 Main St, Lorimor, IA 50149 |
| Shannon City Post Office | 102 Main St, Shannon City, IA 50861 |
| Creston Post Office | 300 S Elm St, Creston, IA 50801 |