Alton City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 417 | US | Missouri - MO | Alton | Central | Details |
| 603 | US | New Hampshire - NH | Alton | Eastern | Details |
| 618 | US | Illinois - IL | Alton | Central | Details |
| 712 | US | Iowa - IA | Alton | Central | Details |
| 785 | US | Kansas - KS | Alton | Central / Mountain | Details |