Ontario Area Code Information

Ontario Area Codes


Ontario Area Code Overlays
(416 and 647 and 437) - (519 and 226)
(613 and 343) - (905 and 289 and 365) - (705 and 249)


Ontario is currently using thirteen area codes. Ontario is utilizing five area code overlay plans, often called overlay complexes. Ontario recently implemented area code 249 to provide numbering relief for area code 705 which was put into service effective 03/19/2011. Area codes 365 and 437 were implemented on 3/25/2013. Area code 365 is an overlay of area codes 289 and 905 and area code 437 is an overlay of area codes 647 and 416.

Ontario originally had two area codes when the numbering system was established in 1947. By 1953 Ontario experienced sufficient growth in population and telephone use to need an additional area codes. To meet this increase in demand the two original area codes 416 and 613, established in 1947, were split to form area code 519. Four years later in 1957 area codes 613 and 519 were split to form area code 705. These changes resulted in four area codes being utilized in Ontario by 1957. In 1962 area code 705 was split to establish area code 807.

These five area codes were sufficient for more than 31 years when in 1993 area code 416 was split to form area code 905. Between 2001 and 2013 seven more area codes were established and put into service. These changes resulted in the thirteen area codes in use today.

Changes and History of Ontario Area Codes:

01/01/1947
Area code 416 was put into service. In 1953 area code 416, along with area code 613, was split to form area code 519. In 1993 area code 416 was split to form area code 905. In 2001 area code 416 was overlaid with area code 647.

01/01/1947
Area code 613 was put into service. In 1953 area code 613, along with area code 416, was split to form area code 519. In 1957 area code 613, along with area code 519, was split to form area code 705. Area code 343 is proposed as an area code overlay of area code 613 effective 05/17/2010.

01/01/1953
Area code 519 was put into service. Area code 519 was created from a split of area codes 416 and 613. In 1957 area code 519, along with area code 613, was split to form area code 705. In 2006 area code 519 was overlaid with area code 226.

01/01/1957
Area code 705 was put into service. Area code 705 was created from a split of area codes 613 and 519. In 1962 area code 705 was split to form area code 807. Area code 249 is proposed as an area code overlay of area code 705 effective 03/19/2011.

01/01/1962
Area code 807 was put into service. Area code 807 was created from a split of area code 705.

10/04/1993
Area code 905 was put into service. Area code 905 was created from a split of area code 416. In 2001 area code 905 was overlaid with area code 289.

03/05/2001
Area code 647 was put into service. Area code 647 is an overlay of area code 416.

06/09/2001
Area code 289 was put into service. Area code 289 is an overlay of area code 905.

10/21/2006
Area code 226 was put into service. Area code 226 is an overlay of area code 519.

05/17/2010
Area code 343 was put into service. Area code 343 is an overlay of area code 613.

03/19/2011
Area code 249 was put into service as an overlay of area code 705.

03/25/2013
Area code 365 was put into service as an overlay of area codes 289 and 905.

03/25/2013
Area code 437 was put into service as an overlay of area codes 416 and 647.

Ontario Area Code Map

Area Codes By Province or Territory