Residents of Brampton, T-V — Sub-district C, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 22 | ohara | john | M | 29 | Roman Catholic | Irish | Ontario | Labourers nfs | 90 |
| 24 | ohara | katy | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 23 | ohara | mary | F | 27 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 7 | oliver | anne | F | 58 | Methodist | English | England | No Occupation Listed | 83 |
| 6 | oliver | noble | M | 67 | Methodist | Irish | Ireland | Medical Doctors and physicians (not UK) | 83 |
| 3 | ollerhard | diana | F | 16 | Presbyterian | English | England | No Occupation Listed | 86 |
| 5 | ollerhard | eliza | F | 13 | Presbyterian | English | England | No Occupation Listed | 86 |
| 4 | ollerhard | george | M | 15 | Presbyterian | English | England | No Occupation Listed | 86 |
| 6 | ollerhard | helen | F | 12 | Presbyterian | English | England | No Occupation Listed | 86 |
| 2 | ollerhard | mary | F | 47 | Presbyterian | English | England | No Occupation Listed | 86 |
| 7 | ollerhard | mary | F | 10 | Presbyterian | English | England | No Occupation Listed | 86 |
| 1 | ollerharnd | wm | M | 45 | Presbyterian | English | England | Farmers, general and nfs | 86 |
| 7 | oneil | susan | F | 17 | Roman Catholic | Irish | Ontario | Servants nfs | 22 |
| 18 | orr | adeline | F | 31 | Anglican | Irish | Ontario | No Occupation Listed | 108 |
| 20 | orr | bertha | F | 7 | Anglican | Irish | Ontario | No Occupation Listed | 108 |
| 21 | orr | florence | F | 2 | Anglican | Irish | Ontario | No Occupation Listed | 108 |
| 19 | orr | roland | M | 8 | Anglican | Irish | Ontario | No Occupation Listed | 108 |
| 17 | orr | samuel | M | 32 | Anglican | Irish | Ontario | Labourers nfs | 108 |
| 4 | osburn | harry | M | 7 | Methodist | English | United States | No Occupation Listed | 152 |
| 3 | osburn | maria | F | 60 | Methodist | English | England | No Occupation Listed | 152 |
| 2 | osburn | thomas | M | 70 | Methodist | English | England | Butchers | 152 |