Post Offices List in Alton City, Illinois:
| Alton Post Office | 2350 Homer M Adams Pkwy, Alton, IL 62002 |
| Alton Square Post Office | 117 Alton Sq, Alton, IL 62002 |
| Upper Alton Post Office | 1624 Main St, Alton, IL 62002 |
| Alton Post Office | 2350 Homer M Adams Pkwy, Alton, IL 62002 |
| Alton Square Post Office | 117 Alton Sq, Alton, IL 62002 |
| Upper Alton Post Office | 1624 Main St, Alton, IL 62002 |