Ontario Area Codes
Directory of all 22 telephone area codes assigned to Ontario.
Ontario phone numbers are served by 22 area codes operating in the Eastern / Central, Eastern timezones.Because an overlay is active, 10-digit dialing is mandatory across much of the state. No area codes in Ontario are currently flagged as high-risk scams.
Most populated prefix: area code 226 (Ontario)
All Area Codes in Ontario
Area Code 226
Amherstburg, Aylmer, Brantford, Goderich, Guelph
Area Code 249
Barrie, Bracebridge, Collingwood, Greater Sudbury, Huntsville
Area Code 289
Ajax, Ancaster, Brampton, Burlington, Cobourg
Area Code 343
Belleville, Brockville, Carleton Place, Clarence-Rockland, Cornwall
Area Code 365
Hamilton, Oshawa
Area Code 382
Ontario And Surrounding Communities
Area Code 387
Ontario And Surrounding Communities
Area Code 416
Ancaster, Toronto
Area Code 437
Toronto
Area Code 460
Ontario And Surrounding Communities
Area Code 519
Amherstburg, Ancaster, Aylmer, Brantford, Dorchester
Area Code 537
Ontario And Surrounding Communities
Area Code 548
Ontario And Surrounding Communities
Area Code 613
Ancaster, Arnprior, Belleville, Brockville, Carleton Place
Area Code 647
Toronto
Area Code 683
Ontario And Surrounding Communities
Area Code 705
Ancaster, Angus, Barrie, Bracebridge, Collingwood
Area Code 742
Ontario And Surrounding Communities
Area Code 753
Ontario And Surrounding Communities
Area Code 807
Ancaster, Dryden, Fort Frances, Thunder Bay
Area Code 871
Ontario And Surrounding Communities
Area Code 905
Ajax, Ancaster, Brampton, Burlington, Cobourg
Major Cities Served by Ontario Area Codes
The most populous urban centers and census places covered by Ontario's area codes, ranked by population.
Ontario Area Code FAQs
Quick answers to common questions about Ontario telephone area codes.
How many area codes does Ontario have?
Ontario has 22 area codes: 226, 249, 289, 343, 365, 382, 387, 416, 437, 460, 519, 537, 548, 613, 647, 683, 705, 742, 753, 807, 871, 905.
What timezone do Ontario area codes use?
Ontario area codes operate in the Eastern / Central, Eastern timezones.
What is the most populated area code in Ontario?
Area code 226 is the most populous prefix in Ontario based on covered city population.
Which Ontario area codes share an overlay?
226 and 382, 226 and 519, 226 and 548, 249 and 683, 249 and 705, 289 and 365, 289 and 742, 289 and 905, 343 and 613, 343 and 753, 365 and 742, 365 and 905, 382 and 519, 382 and 548, 416 and 437, 416 and 647, 437 and 647, 519 and 548, 613 and 753, 683 and 705, 742 and 905. Overlay codes serve the same area, which is why 10-digit dialing is required.
Are there scam area codes in Ontario?
Ontario has no area codes currently flagged as high-risk scams.
About Ontario Area Codes & Phone Dialing Rules
When placing calls within Ontario, ten-digit dialing (area code + 7-digit telephone number) is required in overlay regions where multiple area codes serve the same geographic boundaries.