Records Browser
| Census subdivision | Census division | Province | Year | Total population |
|---|---|---|---|---|
| March | Carleton | ON | 1851 | 1125 |
| Mariposa | Victoria | ON | 1851 | 3895 |
| Markham | York | ON | 1851 | 7752 |
| Marlborough | Carleton | ON | 1851 | 2053 |
| Marmora | Hastings | ON | 1851 | 635 |
| Maryborough | Wellington | ON | 1851 | 994 |
| Marysburg | Prince Edward | ON | 1851 | 3512 |
| Maternity Hospital | Toronto, City | ON | 1851 | 4 |
| Matilda | Dundas | ON | 1851 | 4198 |
| McGillivray | Huron | ON | 1851 | 1718 |