Belvidere City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 252 | US | North Carolina - NC | Belvidere | Eastern | Details |
| 605 | US | South Dakota - SD | Belvidere | Central / Mountain | Details |
| 779 | US | Illinois - IL | Belvidere | Central | Details |
| 815 | US | Illinois - IL | Belvidere | Central | Details |
| 908 | US | New Jersey - NJ | Belvidere | Eastern | Details |