Phone area codes for Cornwall, ON
2 active area codes · Eastern Time (EST/EDT, UTC-5/-4) · population 47,845.
Cornwall is a port city on the St. Lawrence River in eastern Ontario, near the Quebec and New York borders.
Area codes serving Cornwall
Dialling from and to Cornwall
Because Cornwall sits inside an overlay region with 2 overlapping area codes, callers must always dial 10 digits — even for calls between two phones on the same street. From outside Canada and the United States, dial your international access prefix, then +1, then the 10-digit number.
Mobile carriers in Cornwall typically issue numbers from whichever overlay code is currently being released by the NANP relief plan. As a result, two members of the same household frequently carry numbers from two different area codes — for example a long-time resident with an original-assignment number and a newer subscriber with an overlay number.
Major carriers serving Cornwall
About Cornwall, Ontario
Cornwall is located in Ontario, Canada. Cornwall is a port city on the St. Lawrence River in eastern Ontario, near the Quebec and New York borders. The city falls within the Eastern Time (EST/EDT, UTC-5/-4) time zone.
Numbers issued to subscribers in Cornwall can come from any of the area codes assigned to the surrounding numbering plan area: 613, 343. With number portability now standard across all Canadian carriers, the area code attached to a Cornwall number tells you only where that number was first issued — not who currently carries it or where the device is physically located.
If you are trying to identify a recent call from 613 or 343, the caller is most likely either based in Cornwall or another community within the same NPA, has previously held a number issued in this area, or — in the case of telemarketing and scam calls — is spoofing a local prefix to increase the chance you pick up.