Phone area codes for Sarnia, ON
1 active area code · Eastern Time (EST/EDT, UTC-5/-4) · population 72,047.
Sarnia sits at the southern end of Lake Huron and is the heart of Canada's Chemical Valley petrochemical cluster.
Area codes serving Sarnia
Dialling from and to Sarnia
Because Sarnia sits inside a single-NPA region, callers may still be able to use 7-digit local dialling, though 10-digit dialling is universally accepted. From outside Canada and the United States, dial your international access prefix, then +1, then the 10-digit number.
Mobile carriers in Sarnia 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 Sarnia
About Sarnia, Ontario
Sarnia is located in Ontario, Canada. Sarnia sits at the southern end of Lake Huron and is the heart of Canada's Chemical Valley petrochemical cluster. The city falls within the Eastern Time (EST/EDT, UTC-5/-4) time zone.
Numbers issued to subscribers in Sarnia can come from any of the area codes assigned to the surrounding numbering plan area: 519. With number portability now standard across all Canadian carriers, the area code attached to a Sarnia 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 519, the caller is most likely either based in Sarnia 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.