List Of Ontario Area Codes - Wikipedia

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Canada was divided into nine numbering plan areas with unique area codes in 1947 when the American Telephone and Telegraph Company (AT&T) designed the first comprehensive telephone numbering plan for the North American continent for Operator Toll Dialing. This was an effort to speed up the connection time of long-distance telephone calls, by eliminating a large group of intermediate telephone operators, and implementing destination code routing. The effort eventually led to Direct Distance Dialing (DDD) by telephone subscribers, and the North American Numbering Plan.

Yukon, the far northern regions, and Newfoundland and Labrador (which was a British dominion at the time) were not included in the first assignments of 1947 for lack of telephone service. Locations with service bordering a numbering plan area, were later served with codes of the regional carriers, such as Northwestel, with toll-routing infrastructure.

Numbering plan area Area code(s)(1947) Area code(s)by expansion and splits Area code(s)by overlays
Alberta 403 780 368, 587, 825
British Columbia 604 250 236, 672, 778, 257
Manitoba 204 431, 584
New Brunswick (902)* 506 428
Newfoundland and Labrador (902)*, 709 879
Nova Scotia and Prince Edward Island 902 782
Ontario 416, 613 519, 705, 807, 905 226, 249, 289, 343, 382, 365, 437, 548, 647, 683, 742, 753, 942
Quebec 418, 514 450, 819 263, 354, 367, 438, 468, 579, 581, 873
Saskatchewan 306 474, 639
Yukon, Northwest Territories, and Nunavut (403, 418, 819)**, 867
Notes: * Area code was withdrawn from area** served by codes of regional carriers

No numbering plan areas have been split in Canada since 1999.

Area codes 807 and 867 are the only remaining Canadian area codes that are not part of an overlay. Calls within each of these numbering plan areas may be initiated by seven-digit dialing.

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