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
249: Most of Northeastern and Central Ontario; overlays 705
289: The Niagara Peninsula, Hamilton, Oshawa, and the suburban Greater Toronto Area; overlays with 905 and 365
343: Ottawa and surrounding Eastern Ontario; overlays with 613
365: The Niagara Peninsula, Hamilton, Oshawa, and the suburban Greater Toronto Area; 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
613: Ottawa and surrounding Eastern Ontario; overlays with 343
647: Toronto; overlays with 416 and 437
705: Most of Northeastern and Central Ontario; overlays with 249
807: Most of Northwestern Ontario
905: The Niagara Peninsula, Hamilton, Oshawa, and the suburban Greater Toronto Area; overlays with 289 and 365
