List of Ontario area codes
# List of Ontario area codes

This is a list of area codes in the province of Ontario:

* 226: London, Kitchener–Waterloo, Windsor, and most of Southwestern Ontario; overlays with 519 and 548
* 249: Most of Northeastern and Central Ontario; overlays with 683 and 705
* 289: Niagara Region, Hamilton, Halton Region, Peel Region, York Region and Durham Region; overlays with 905 and 365
* 343: Ottawa and surrounding Eastern Ontario; overlays with 613
* 365: Niagara Region, Hamilton, Halton Region, Peel Region, York Region and Durham Region; overlays with 905 and 289
* 416: Toronto; overlays with 647 and 437
* 437: Toronto; overlays with 647 and 416
* 519: London, Kitchener–Waterloo, Windsor, and most of Southwestern Ontario; overlays with 226 and 548
* 548: London, Kitchener–Waterloo, Windsor, and most of Southwestern Ontario; overlays with 519 and 226
* 613: Ottawa and surrounding Eastern Ontario; overlays with 343
* 647: Toronto; overlays with 416 and 437
* 683: Most of Northeastern and Central Ontario; overlays with 249 and 705
* 705: Most of Northeastern and Central Ontario; overlays with 249 and 683
* 807: Most of Northwestern Ontario
* 905: Niagara Region, Hamilton, Halton Region, Peel Region, York Region and Durham Region; overlays with 289 and 365
