Area code 742
Area code 742 holds 146 in-service central-office prefixes in the CNAC register, covering roughly 1,460,000 telephone numbers. They are split between 14 carriers and 68 rate centres. The largest is Brampton. Recorded assignments run from June 17, 2021 to October 7, 2025. That ranks it 42 of 55 Canadian area codes by prefix count.
Background reading: Caller ID spoofing, STIR/SHAKEN, and how to actually block calls in Canada · Canadian area codes, overlays, and what a 416 number actually tells you · One-ring scams and the Caribbean area codes that look Canadian
In numbers
- In-service prefixes
- 146
- Telephone numbers covered
- 1,460,000
- Carriers
- 14
- Rate centres
- 68
- Provinces and territories
- 1
- First assignment
- June 17, 2021
- Most recent assignment
- October 7, 2025
Who holds these numbers
FGLTEL Inc. holds the largest share at 34 prefixes, 23.3% of the total, ahead of 13 other carriers.
| Carrier | Prefixes | Share | First assigned |
|---|---|---|---|
| FGLTEL Inc. | 34 | 23.3 % | 2022 |
| Beanfield Technologies Inc. | 24 | 16.4 % | 2021 |
| Rogers Communications Canada Inc. (Cable) | 16 | 11.0 % | 2022 |
| IXICA Communications Inc. | 15 | 10.3 % | 2021 |
| Fibernetics Corporation | 13 | 8.9 % | 2023 |
| Rogers Communications Canada Inc. (Wireless) | 10 | 6.8 % | 2023 |
| Cogeco Connexion Inc. | 9 | 6.2 % | 2024 |
| Bell Mobility | 7 | 4.8 % | 2023 |
| TELUS Mobility | 6 | 4.1 % | 2021 |
| Iristel Inc. | 5 | 3.4 % | 2022 |
| ISP Telecom Inc. | 3 | 2.1 % | 2021 |
| Fido Solutions Inc. | 2 | 1.4 % | 2022 |
| TELUS Integrated Communications | 1 | 0.7 % | 2021 |
| Videotron Ltd. | 1 | 0.7 % | 2024 |
Where these numbers land
Prefixes in 742 serve 68 rate centres. A rate centre is the billing area a prefix is attached to, not where the handset is.
| Rate centre | Province | Prefixes | Carriers |
|---|---|---|---|
| Brampton | ON | 11 | 6 |
| Hamilton | ON | 8 | 4 |
| St. Catharines-Thorold | ON | 8 | 5 |
| Ajax-Pickering | ON | 6 | 4 |
| Cobourg | ON | 3 | 3 |
| Cooksville | ON | 3 | 3 |
| Markham | ON | 3 | 3 |
| Niagara Falls | ON | 3 | 3 |
| Pelham | ON | 3 | 3 |
| Richmond Hill | ON | 3 | 3 |
| Streetsville | ON | 3 | 3 |
| Thornhill | ON | 3 | 3 |
| Uxbridge | ON | 3 | 3 |
| Wainfleet | ON | 3 | 3 |
| Aurora | ON | 2 | 2 |
| Bethesda | ON | 2 | 2 |
| Bolton | ON | 2 | 2 |
| Burlington | ON | 2 | 2 |
| Caledon East | ON | 2 | 2 |
| Castlemore | ON | 2 | 2 |
| Claremont | ON | 2 | 2 |
| Clarkson | ON | 2 | 2 |
| Georgetown | ON | 2 | 2 |
| Gormley | ON | 2 | 2 |
| Keswick | ON | 2 | 2 |
| King City | ON | 2 | 2 |
| Kleinburg | ON | 2 | 2 |
| Malton | ON | 2 | 2 |
| Maple | ON | 2 | 2 |
| Milton | ON | 2 | 2 |
| Mount Albert | ON | 2 | 2 |
| Newmarket | ON | 2 | 2 |
| Niagara-On-The-Lake | ON | 2 | 2 |
| Oak Ridges | ON | 2 | 2 |
| Oshawa | ON | 2 | 2 |
| South Pickering | ON | 2 | 2 |
| Stouffville | ON | 2 | 2 |
| Sutton | ON | 2 | 2 |
| Unionville | ON | 2 | 2 |
| Welland | ON | 2 | 2 |
| Wellandport | ON | 2 | 2 |
| Whitby | ON | 2 | 2 |
| Woodbridge | ON | 2 | 2 |
| Beamsville | ON | 1 | 1 |
| Beeton | ON | 1 | 1 |
| Blackstock | ON | 1 | 1 |
| Bowmanville | ON | 1 | 1 |
| Bradford | ON | 1 | 1 |
| Brooklin | ON | 1 | 1 |
| Cayuga | ON | 1 | 1 |
| Fisherville | ON | 1 | 1 |
| Freelton | ON | 1 | 1 |
| Hampton | ON | 1 | 1 |
| Newcastle | ON | 1 | 1 |
| Newtonville | ON | 1 | 1 |
| Nobleton | ON | 1 | 1 |
| Palgrave | ON | 1 | 1 |
| Port Colborne | ON | 1 | 1 |
| Port Credit | ON | 1 | 1 |
| Port Perry | ON | 1 | 1 |
| Port Robinson | ON | 1 | 1 |
| Queensville | ON | 1 | 1 |
| Schomberg | ON | 1 | 1 |
| Selkirk | ON | 1 | 1 |
| Snelgrove | ON | 1 | 1 |
| Tottenham | ON | 1 | 1 |
| Victoria | ON | 1 | 1 |
| Vineland | ON | 1 | 1 |
How the allocation was built up
| Period | Prefixes | Carriers |
|---|---|---|
| 2020–2024 | 126 | 14 |
| 2025–2029 | 20 | 6 |
Overlay area codes
742 shares its rate centres with 365, 905, 289, 506, 204, 236, 250, 431, 450, 579, 672, 709. Overlay codes cover the same ground, which is why ten-digit dialling is required: two neighbours on one street can hold different area codes.
Allocated prefixes
Showing 114 of 146 prefixes, largest rate centres first.
Brampton, ON
742-222 · 742-239 · 742-247 · 742-472 · 742-588 · 742-614 · 742-615 · 742-616 · 742-688 · 742-701
Hamilton, ON
742-218 · 742-444 · 742-550 · 742-556 · 742-558 · 742-855 · 742-880 · 742-999
St. Catharines-Thorold, ON
742-212 · 742-213 · 742-219 · 742-220 · 742-488 · 742-599 · 742-601 · 742-666
Ajax-Pickering, ON
742-229 · 742-400 · 742-745 · 742-986 · 742-987 · 742-988
Cobourg, ON
742-288 · 742-350 · 742-450
Cooksville, ON
742-245 · 742-583 · 742-724
Markham, ON
742-377 · 742-771 · 742-777
Niagara Falls, ON
742-500 · 742-770 · 742-882
Pelham, ON
742-442 · 742-884 · 742-888
Richmond Hill, ON
742-200 · 742-385 · 742-773
Streetsville, ON
742-244 · 742-300 · 742-532
Thornhill, ON
742-228 · 742-389 · 742-774
Uxbridge, ON
742-392 · 742-899 · 742-901
Wainfleet, ON
742-422 · 742-788 · 742-889
Aurora, ON
742-368 · 742-989
Bethesda, ON
742-369 · 742-990
Bolton, ON
742-370 · 742-991
Burlington, ON
742-401 · 742-700
Caledon East, ON
742-240 · 742-301
Castlemore, ON
742-242 · 742-302
Claremont, ON
742-371 · 742-992
Clarkson, ON
742-246 · 742-303
Georgetown, ON
742-461 · 742-885
Gormley, ON
742-372 · 742-993
Keswick, ON
742-373 · 742-994
King City, ON
742-374 · 742-995
Kleinburg, ON
742-375 · 742-996
Malton, ON
742-227 · 742-243
Maple, ON
742-376 · 742-997
Milton, ON
742-234 · 742-886
Mount Albert, ON
742-378 · 742-998
Newmarket, ON
742-379 · 742-772
Niagara-On-The-Lake, ON
742-367 · 742-776
Oak Ridges, ON
742-210 · 742-381
Oshawa, ON
742-333 · 742-746
South Pickering, ON
742-276 · 742-747
Stouffville, ON
742-312 · 742-387
Sutton, ON
742-388 · 742-800
Unionville, ON
742-391 · 742-900
Welland, ON
742-225 · 742-883
Allocation source: Canadian Numbering Administrator (CNAC), the registry that records which carrier a central-office code was originally issued to. An allocation says who was issued the prefix, not who serves the number today: numbers can be ported between carriers, and caller ID can be spoofed outright.