Coverage tracker
How much of Ontario we track
39,658
heritage-register properties in the system, across 41 municipalities
Listed, including designation started17,263 of ~36,000
48.0% · These lose their listing on January 1, 2027 unless council moves to designate. Total from Active History.
Designated22,395 of ~30,200
74.2% · Protected under Part IV or Part V of the Ontario Heritage Act. Total from Ontario Heritage Trust.
Register properties in the system over time
Show as a table
| Date | Register properties |
|---|---|
| 2026-10-05 | 35,574 |
| 2026-10-06 | 35,606 |
| 2026-10-07 | 39,129 |
| 2026-10-08 | 39,129 |
| 2026-10-09 | 39,658 |
| 2026-10-10 | 39,658 |
| 2026-10-11 | 39,658 |
| 2026-10-12 | 39,658 |
By municipality
| Municipality | Listed | Designation started | Designated | Removed or demolished | Inventory only | Source as of |
|---|---|---|---|---|---|---|
| Toronto | 3,479 | 0 | 8,832 | 21 | – | September 1, 2026 |
| London | 2,179 | 0 | 4,051 | 0 | – | October 12, 2026 |
| Hamilton | 2,265 | 4 | 1,020 | 65 | 6,940 | October 12, 2026 |
| Guelph | 1,683 | 9 | 541 | 0 | – | August 24, 2026 |
| Mississauga | 1,321 | 4 | 556 | 29 | – | October 6, 2026 |
| Kingston | 166 | 0 | 1,198 | 5 | – | October 12, 2026 |
| Kitchener | 159 | 3 | 1,165 | 0 | – | October 12, 2026 |
| Cambridge | 729 | 0 | 431 | 0 | – | August 24, 2026 |
| St. Catharines | 181 | 0 | 874 | 0 | – | October 12, 2026 |
| Windsor | 909 | 0 | 146 | 0 | – | October 12, 2026 |
| Milton | 892 | 0 | 84 | 1 | – | October 10, 2026 |
| Oakville | 195 | 0 | 692 | 0 | – | October 12, 2026 |
| Whitby | 198 | 0 | 436 | 0 | – | July 1, 2023 |
| Brampton | 330 | 5 | 278 | 0 | 1 | September 21, 2026 |
| Grimsby | 477 | 0 | 88 | 0 | – | June 10, 2026 |
| Aurora | 273 | 0 | 254 | 0 | – | March 1, 2025 |
| Orangeville | 409 | 0 | 108 | 7 | – | October 12, 2026 |
| Niagara-on-the-Lake | 161 | 0 | 245 | 0 | – | January 28, 2026 |
| Cobourg | 209 | 0 | 154 | 0 | – | October 12, 2016 |
| Chatham-Kent | 274 | 0 | 77 | 0 | – | June 7, 2021 |
| St. Marys | 103 | 0 | 182 | 0 | – | September 23, 2026 |
| Prince Edward County | 184 | 0 | 94 | 0 | – | September 16, 2026 |
| Burlington | 142 | 0 | 129 | 0 | – | October 12, 2026 |
| Port Hope | 0 | 0 | 215 | 0 | – | April 17, 2023 |
| Niagara Falls | 105 | 0 | 66 | 0 | – | September 22, 2026 |
| Clarington | 18 | 0 | 104 | 0 | – | August 5, 2026 |
| Thunder Bay | 41 | 0 | 80 | 0 | – | August 30, 2022 |
| Georgina | 70 | 0 | 47 | 0 | – | May 22, 2024 |
| Pickering | 78 | 0 | 15 | 0 | – | June 1, 2021 |
| Thorold | 0 | 0 | 47 | 0 | – | February 2, 2024 |
| Oshawa | 0 | 0 | 42 | 0 | – | June 1, 2025 |
| Ajax | 0 | 0 | 31 | 72 | 142 | October 12, 2026 |
| Welland | 0 | 0 | 31 | 0 | – | October 12, 2026 |
| Fort Erie | 0 | 0 | 23 | 0 | – | February 2, 2024 |
| Lincoln | 0 | 0 | 21 | 0 | – | February 2, 2024 |
| Greater Sudbury | 7 | 0 | 10 | 0 | – | October 7, 2026 |
| Port Colborne | 0 | 0 | 17 | 0 | – | February 2, 2024 |
| West Lincoln | 0 | 0 | 6 | 0 | – | February 2, 2024 |
| Pelham | 0 | 0 | 4 | 0 | – | February 2, 2024 |
| Collingwood | 1 | 0 | 0 | 0 | – | October 8, 2026 |
| Wainfleet | 0 | 0 | 1 | 0 | – | February 2, 2024 |
| Total | 17,238 | 25 | 22,395 | 200 | 7,083 |
“Source as of” is the date each municipality's data was current. Mississauga's open data was last updated in January 2024. Inventory-only properties are on a city inventory, not the register, and aren't counted above. Province-wide totals are approximate.