19 area codes assigned to Ontario · Eastern Time
5 of Ontario's area codes share territory with another. Codes in the same row serve the same places, so either can reach a number there — and ten-digit dialling is required throughout.
The remaining code covers their own area: 807.
Ontario went from 2 area codes in 1947 to 19 today. A split carves territory off its parent; an overlay sits on top of it, which is why newer codes need ten-digit dialling.
Dates from the NANPA area code report, 09/19/2026.
Ontario spans 1 LATA — the regions a call is routed within before it becomes long-haul.
226
Ontario
Eastern Time
Overlay · with 382, 519, 548
778 blocks · 166 rate centres
249
Ontario
Eastern Time
Overlay · with 683, 705
587 blocks · 176 rate centres
289
Ontario
Eastern Time
Overlay · with 365, 742, 905
772 blocks · 87 rate centres
343
Ontario
Eastern Time
Overlay · with 613, 753
642 blocks · 116 rate centres
365
Ontario
Eastern Time
Overlay · with 289, 742, 905
709 blocks · 88 rate centres
382
Ontario
Eastern Time
Overlay · Jun 17, 2023 · with 226, 519, 548
77 blocks · 41 rate centres
416
Ontario
Eastern Time
Overlay · with 437, 647, 942
778 blocks · 1 rate centre
437
Ontario
Eastern Time
Overlay · with 416, 647, 942
553 blocks · 1 rate centre
519
Ontario
Eastern Time
Overlay · with 226, 382, 548
778 blocks · 210 rate centres
548
Ontario
Eastern Time
Overlay · with 226, 382, 519
514 blocks · 170 rate centres
613
Ontario
Eastern Time
Overlay · with 343, 753
771 blocks · 132 rate centres
647
Ontario
Eastern Time
Overlay · with 416, 437, 942
778 blocks · 1 rate centre
683
Ontario
Eastern Time
Overlay · Jun 18, 2022 · with 249, 705
81 blocks · 58 rate centres
705
Ontario
Eastern Time
Overlay · with 249, 683
769 blocks · 202 rate centres
742
Ontario
Eastern Time
Overlay · Oct 16, 2021 · with 289, 365, 905
149 blocks · 68 rate centres
753
Ontario
Eastern Time
Overlay · Mar 26, 2022 · with 343, 613
107 blocks · 62 rate centres
807
Ontario
Eastern Time
302 blocks · 85 rate centres
905
Ontario
Eastern Time
Overlay · with 289, 365, 742
772 blocks · 94 rate centres
942
Ontario
Eastern Time
Overlay · Apr 26, 2025 · with 416, 437, 647
56 blocks · 1 rate centre
Ontario has more than one area code in most regions. Enter a city to see which codes serve it, or check a specific number instead.
Ontario has had 18 area codes activated as an overlay since 2021, sharing territory with an existing code rather than carving out new geography. Local calls in an overlaid region must be dialed with all ten digits. Earlier overlays are not listed here.
Ontario is served by 19 area codes in the North American Numbering Plan (NANP): 226, 249, 289, 343, 365, 416, 437, 519, 548, 613, 647, 705, 807, 905, 942, 382, 683, 753, 742. All Ontario numbers are in the Eastern Time zone. Click any area code above to see the cities and rate centers it covers, formatted tel: link examples, and to search for available phone numbers.