Caldwell City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 201 | US | New Jersey - NJ | Caldwell | Eastern | Details |
| 208 | US | Idaho - ID | Caldwell | Mountain / Pacific | Details |
| 620 | US | Kansas - KS | Caldwell | Central / Mountain | Details |
| 740 | US | Ohio - OH | Caldwell | Eastern | Details |
| 862 | US | New Jersey - NJ | Caldwell | Eastern | Details |
| 973 | US | New Jersey - NJ | Caldwell | Eastern | Details |
| 979 | US | Texas - TX | Caldwell | Central | Details |