613 Area Code
Area code 613 is one of the original 86 area codes created by AT&T and the Bell System in 1947. It originally served all of Ontario except a southern portion covering Oshawa-Toronto-Kitchener. In 2010, area code 343 was created as an overlay to area code 613. Currently, the largest city it serves is Ottawa, ON, and it overlaps coverage areas with area code 343.