Ontario Area Code Information
Ontario Area Codes
(289 and 365 and 742 and 905) - (416 and 437 and 647)
(226 and 382 and 519 and 548) - (343 and 613 and 753) - (249 and 683 and 705)
Ontario is currently using nineteen area codes. Ontario is utilizing five area code overlay plans, often called overlay complexes. Ontario recently put area code 753 into service as an all services overlay covering the two existing area code overlays (343 and 613) on 03/26/2022. Area code 742 was put into service to provide numbering relief for existing area codes 905, 289, and 365 on 10/16/2021.
Area code 548 was put into service as an overlay of area codes 226 and 519 on 6/4/2016 and area codes 365 and 437 were put into service 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 2016 eight more area codes were established and put into service.
Area code 742 was put into service as a distributed overlay of area codes 905, 289, and 365 on 10/16/2021. Ten digit dialing (area code + seven digit number) is necessary in the 905/289/365/742 overlay because different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.
Area code 753 was put into service as an all services overlay covering the two existing area code overlays (343 and 613) on 03/26/2022. Ten digit dialing is necessary in the 343/613/753 overlay because different homes in the same geographic area can have the same seven digit phone number but each would have a different area code. Ten digit dialing (area code + seven digit number) is necessary when two or more area codes cover the same geographic area.
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.
06/04/2016
Area code 548 was put into service as an overlay of area codes 226, and 519.
10/16/2021
Area code 742 was put into service as an overlay of area codes 905, 289, and 365.
03/26/2022
Area code 753 was put into service as an overlay of area codes 343 and 613.
06/18/2022
Area code 683 was put into service as an overlay of area codes 249 and 705.
06/17/2023
Area code 382 was put into service as a distributed overlay covering existing area codes 226, 519 and 548.
04/26/2025
Area code 942 will be put into service as an overlay of area codes 416,437 and 647.
