Area codes 613 and 343, Telephone prefix in Eastern Ontario, Canada
Area codes 613 and 343 are telephone prefixes assigned to the eastern portion of Ontario, covering cities such as Ottawa, Kingston and Cornwall. These number ranges serve residents and businesses across a large geographic territory.
The prefix 613 was introduced in 1947 and initially covered large parts of Ontario outside the Golden Horseshoe region. The code 343 was added later as an overlay to meet growing demand for telephone numbers.
The implementation of these codes in Ottawa creates a connection with neighboring Gatineau, Quebec, forming a shared local calling network across provincial borders.
Ten-digit dialing has been mandatory since 2006, requiring all callers to use the full area code plus the seven-digit number. This rule applies even when making calls within the same region.
In March 2022, overlay code 753 was added to address the growing need for new telephone numbers in eastern Ontario. This expansion allowed the assignment of numbers without changing existing lines.
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