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Ontario area codes

The province of Ontario, Canada is currently served by a total of 16 area codes:

Overlaying area codes

These Ontario area codes overlay (cover the same geographic area). The first code listed is the parent code. Overlay area codes are added when no more phone numbers are available in an existing Numbering Plan Area.

  • 416/647/437
  • 519/226/548
  • 613/343/753
  • 705/249
  • 905/289/365/742

Larger Ontario cities and their area codes

City Area code(s)
Ajax905/289/365/742
Aurora905/289/365/742
Barrie705/249
Belleville613/343/753
Brampton905/289/365/742
Brantford519/226/548
Burlington905/289/365/742
Caledon905/289/365/742
Cambridge519/226/548
Cornwall613/343/753
Guelph519/226/548
Haldimand County905/289/365/742
Hamilton905/289/365/742
Innisfil905/289/365/742
Kingston613/343/753
Kitchener519/226/548
Leamington519/226/548
London519/226/548
Milton905/289/365/742
Mississauga905/289/365/742
Newmarket905/289/365/742
Niagara Falls905/289/365/742
Norfolk County519/226/548
North Bay705/249
Oakville905/289/365/742
Orillia705/249
Oshawa905/289/365/742
Ottawa613/343/753
Peterborough705/249
Pickering905/289/365/742
Quinte West613/343/753
Richmond Hill905/289/365/742
Sarnia519/226/548
Sault Ste Marie705/249
St Catharines905/289/365/742
St Thomas519/226/548
Stratford519/226/548
Sudbury705/249
Thunder Bay807
Timmins705/249
Toronto416/647/437
Vaughan905/289/365/742
Waterloo519/226/548
Windsor519/226/548
Woodstock519/226/548