Quick answer
Ontario has 11 active geographic area codes covering Mississauga, Toronto, London. The most-recognized codes are 416, 613, 519, serving Mississauga and the Greater Toronto Area (905 belt) region.
- Total codes
- 11
- Top metro
- Mississauga
- Time zone
- ET
- Largest code
- 289 (Mississauga)
Area codes in Ontario
Ontario is served by 11 active geographic area codes in the North American Numbering Plan. These codes were assigned between 1947 and 2019 as population and call demand grew across the province.
| Code | Primary City | Region | Established | Overlay Codes | Population |
|---|---|---|---|---|---|
| 226 | London | Southwestern Ontario | 2006 | 519, 548 | 2,500,000 |
| 289 | Mississauga | Greater Toronto Area (905 belt) | 2001 | 905, 365 | 4,000,000 |
| 343 | Ottawa | Eastern Ontario | 2010 | 613 | 1,400,000 |
| 365 | Mississauga | Greater Toronto Area (905 belt) | 2013 | 905, 289 | 4,000,000 |
| 416 | Toronto | City of Toronto | 1947 | 647, 437 | 3,000,000 |
| 437 | Toronto | City of Toronto | 2013 | 416, 647 | 3,000,000 |
| 519 | London | Southwestern Ontario | 1953 | 226, 548 | 2,500,000 |
| 548 | London | Southwestern Ontario | 2019 | 519, 226 | 2,500,000 |
| 613 | Ottawa | Eastern Ontario | 1947 | 343 | 1,400,000 |
| 647 | Toronto | City of Toronto | 2001 | 416, 437 | 3,000,000 |
| 905 | Mississauga | Greater Toronto Area (905 belt) | 1993 | 289, 365 | 4,000,000 |
Time zones in Ontario
All area codes in Ontario fall in the ET time zone.
- ET — area codes: 226, 289, 343, 365, 416, 437, 519, 548, 613, 647, 905
Top metros and their area codes
Below are the primary cities in Ontario and the area codes that serve each metro. Cities with multiple codes share geography due to overlay assignments added as demand grew.
Why get a local Ontario number?
A Ontario area code number gives your business three core advantages:
- Local trust signal. Customers in Ontario recognize local area codes as their own. A familiar caller ID builds immediate credibility for service businesses, sales teams, and patient communication.
- Higher answer rate. Calls from a local area code are answered far more often than toll-free or out-of-area numbers — industry data puts the lift at 20–40%. That difference matters most for outbound sales, appointment confirmations, and service callbacks.
- Targeted marketing. Advertising a local Ontario number on print, radio, digital, and outdoor channels converts better than a national 800 number for audiences who prefer doing business locally.
How to get a Ontario area code number with DialPhone
Setting up a Ontario business number takes under 10 minutes:
- Sign up for a DialPhone plan. Choose any plan starting at $24/user/month. Free 14-day trial, no credit card required.
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- Port your existing number (optional). Already have a Ontario number? Free number porting completes in 2 to 5 business days with zero service interruption.