The largest brokerages in Thornhill
7 offices, 550 agents counted at the 2026-08-07 scan. CENTURY 21 Heritage Group Ltd. Brokerage leads with 229 agents — 41.6% of the tracked roster, ahead of REMAX Realtron Realty Inc at 216. The local market is unusually concentrated — three offices hold most of it (top three hold 88.4%).
Every office we track in Thornhill
| # | Office | Network | Agents | Share |
|---|---|---|---|---|
| 1 | CENTURY 21 Heritage Group Ltd. Brokerage | Century 21 | 229 | 41.6% |
| 2 | REMAX Realtron Realty Inc | RE/MAX | 216 | 39.3% |
| 3 | REMAX West Realty Inc | RE/MAX | 41 | 7.5% |
| 4 | REMAX Your Community Realty | RE/MAX | 29 | 5.3% |
| 5 | REMAX YC Realty | RE/MAX | 24 | 4.4% |
| 6 | Sutton Group - Admiral Realty Inc., Brokerage | Sutton | 10 | 1.8% |
| 7 | Sutton Group - Incentive Realty Inc., Brokerage | Sutton | 1 | 0.2% |
Offices with fewer than 10 agents appear in this table but don't get their own page. Across the 321 Thornhill agents whose sites we check, 67.9% list a website of their own (national 56.7%).
Network mix in Thornhill
Coverage: these are the 3 national networks we scrape — about 44.4% of Canadian REALTORS® nationally. Independents and brokerages outside those networks aren't counted, so read this as the largest offices among the networks we track in Thornhill. Methodology →
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