Phone prefixes in Thornhill, ON
Thornhill, ON is a rate centre in the Canadian numbering plan. CNAC records 71 in-service prefixes there, held by 18 carriers and spread across 4 area codes (905, 365, 289, 742).
Background reading: Canadian area codes, overlays, and what a 416 number actually tells you · Caller ID spoofing, STIR/SHAKEN, and how to actually block calls in Canada
In numbers
- In-service prefixes
- 71
- Telephone numbers covered
- 710,000
- Carriers
- 18
- Area codes
- 4
- Provinces and territories
- 1
- First assignment
- January 7, 2000
- Most recent assignment
- May 27, 2025
Area codes
Who holds these numbers
Bell Canada holds the largest share at 20 prefixes, 28.2% of the total, ahead of 17 other carriers.
| Carrier | Prefixes | Share | First assigned |
|---|---|---|---|
| Bell Canada | 20 | 28.2 % | 2005 |
| Iristel Inc. | 19 | 26.8 % | 2007 |
| Rogers Communications Canada Inc. (Cable) | 7 | 9.9 % | 2004 |
| Fibernetics Corporation | 4 | 5.6 % | 2007 |
| Zayo Canada Inc. | 4 | 5.6 % | 2000 |
| Distributel | 3 | 4.2 % | 2013 |
| TELUS Integrated Communications | 3 | 4.2 % | 2004 |
| Beanfield Technologies Inc. | 1 | 1.4 % | 2021 |
| Cogeco Connexion Inc. | 1 | 1.4 % | 2025 |
| Comwave Networks | 1 | 1.4 % | 2013 |
| FGLTEL Inc. | 1 | 1.4 % | 2022 |
| Fido Solutions Inc. | 1 | 1.4 % | 2001 |
| ISP Telecom Inc. | 1 | 1.4 % | 2006 |
| IXICA Communications Inc. | 1 | 1.4 % | 2017 |
| InnSysVoice Corp | 1 | 1.4 % | 2015 |
| Primus Telecommunications Canada Inc. | 1 | 1.4 % | 2008 |
| Rogers Communications Canada Inc. | 1 | 1.4 % | 2019 |
| TekSavvy Solutions Inc | 1 | 1.4 % | 2021 |
Allocated prefixes
All 71 in-service prefixes, grouped by rate centre.
Thornhill, ON
289-390 · 289-459 · 289-472 · 289-502 · 289-510 · 289-514 · 289-561 · 289-582 · 289-588 · 289-593 · 289-597 · 289-695 · 289-807 · 289-843 · 289-857 · 289-982 · 365-375 · 365-523 · 365-556 · 365-573 · 365-597 · 365-598 · 365-599 · 365-605 · 365-606 · 365-615 · 365-625 · 365-719 · 365-725 · 365-730 · 365-731 · 365-732 · 365-734 · 365-735 · 365-736 · 365-780 · 365-781 · 365-782 · 365-783 · 365-920 · 742-228 · 742-389 · 742-774 · 905-326 · 905-370 · 905-418 · 905-482 · 905-530 · 905-532 · 905-597 · 905-660 · 905-669 · 905-695 · 905-707 · 905-709 · 905-731 · 905-738 · 905-739 · 905-747 · 905-760 · 905-761 · 905-762 · 905-763 · 905-764 · 905-771 · 905-879 · 905-881 · 905-882 · 905-886 · 905-889 · 905-907
Nearby rate centres
| Rate centre | Province | Prefixes | Carriers |
|---|---|---|---|
| Toronto | ON | 2,141 | 24 |
| Ottawa-Hull | ON | 441 | 20 |
| Hamilton | ON | 221 | 23 |
| London | ON | 217 | 23 |
| Kitchener-Waterloo | ON | 164 | 21 |
| Windsor | ON | 133 | 20 |
| Brampton | ON | 116 | 20 |
| Oshawa | ON | 110 | 20 |
| St. Catharines-Thorold | ON | 107 | 19 |
| Barrie | ON | 95 | 18 |
| Oakville | ON | 90 | 18 |
| Kingston | ON | 83 | 19 |
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.