Ontario Dialing Codes, Country Codes and Area Codes
| City | Country Codes | Area Codes | Dialing Codes |
|---|---|---|---|
| Ajax | +1 | 905 | +1 905 |
| Barrie | +1 | 705 | +1 705 |
| Belleville | +1 | 613 | +1 613 |
| Brampton | +1 | 905 | +1 905 |
| Brantford | +1 | 519 | +1 519 |
| Burlington | +1 | 905 | +1 905 |
| Cambridge | +1 | 519 | +1 519 |
| Chatham | +1 | 217 | +1 217 |
| Guelph | +1 | 519 | +1 519 |
| Hamilton | +1 | 905 | +1 905 |
| Kingston | +1 | 613 | +1 613 |
| Kitchener | +1 | 519 | +1 519 |
| London | +1 | 226 | +1 226 |
| Markham | +1 | 905 | +1 905 |
| Milton | +1 | 641 | +1 641 |
| Mississauga | +1 | 289 | +1 289 |
| Niagara Falls | +1 | 905 | +1 905 |
| North Bay | +1 | 705 | +1 705 |
| Oakville | +1 | 905 | +1 905 |
| Oshawa | +1 | 905 | +1 905 |
| Ottawa | +1 | 343 | +1 343 |
| Peterborough | +1 | 705 | +1 705 |
| Pickering | +1 | 905 | +1 905 |
| Richmond Hill | +1 | 905 | +1 905 |
| Sarnia | +1 | 519 | +1 519 |
| Timmins | +1 | 705 | +1 705 |
| Toronto | +1 | 416 | +1 416 |
| Trenton | +1 | 609 | +1 609 |
| Waterloo | +1 | 519 | +1 519 |
| Welland | +1 | 905 | +1 905 |
| Whitby | +1 | 905 | +1 905 |
| Woodbridge | +1 | 703 | +1 703 |
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