Cornwall City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 343 | Canada | Ontario | Cornwall | Eastern | Details |
| 613 | Canada | Ontario | Cornwall | Eastern | Details |
| 802 | US | Vermont - VT | Cornwall | Eastern | Details |
| 845 | US | New York - NY | Cornwall | Eastern | Details |
| 860 | US | Connecticut - CT | Cornwall | Eastern | Details |