Residents of Brock — Sub-district E, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 25 | oake | eva | F | 1 | Reformed Baptist | English | Ontario | No Occupation Listed | 105 |
| 23 | oake | john | M | 45 | Methodist | English | England | Farmers, general and nfs | 105 |
| 24 | oake | sushannah | F | 28 | Reformed Baptist | Irish | Ontario | No Occupation Listed | 105 |
| 3 | obrion | annie | F | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 369 |
| 25 | obrion | bernard | M | 23 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 369 |
| 23 | obrion | ellen | F | 50 | Roman Catholic | Irish | Ireland | No Occupation Listed | 369 |
| 2 | obrion | ellen | F | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 369 |
| 22 | obrion | james | M | 52 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 369 |
| 4 | obrion | james | M | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 369 |
| 5 | obrion | john | M | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 369 |
| 1 | obrion | martin | M | 21 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 369 |
| 16 | obrion | mary | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 98 |
| 24 | obrion | mary | F | 25 | Roman Catholic | Irish | Ontario | No Occupation Listed | 369 |
| 21 | odmell | antony | M | 33 | Roman Catholic | Irish | Ontario | Labourers nfs | 368 |
| 2 | odonovan | fany | F | 48 | Roman Catholic | French | Ontario | No Occupation Listed | 23 |
| 8 | odonovan | fany | F | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 9 | odonovan | harriet | F | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 1 | odonovan | jeremiah | M | 58 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 23 |
| 7 | odonovan | john | M | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 3 | odonovan | maggie | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 4 | odonovan | mary | F | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 6 | odonovan | peter | M | 15 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 23 |
| 5 | odonovan | timothy | M | 17 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 23 |
| 18 | odoyle | mary | F | 85 | Roman Catholic | Irish | Ireland | No Occupation Listed | 99 |
| 17 | odoyle | patrick | M | 91 | Roman Catholic | Irish | Ireland | No Occupation Listed | 99 |
| 24 | ogrady | catherine | F | 68 | Roman Catholic | Irish | Ireland | No Occupation Listed | 346 |
| 10 | oke | ann | F | 71 | Methodist | English | England | No Occupation Listed | 343 |
| 18 | oke | elizabeth | F | 8 | Anglican | English | Ontario | No Occupation Listed | 147 |
| 16 | oke | ellen | F | 42 | Anglican | Scottish | Ontario | No Occupation Listed | 147 |
| 9 | oke | john | M | 79 | Methodist | English | England | No Occupation Listed | 343 |
| 15 | oke | joseph | M | 40 | Anglican | English | England | Labourers nfs | 147 |
| 19 | oke | margarett | F | 3 | Anglican | English | Ontario | No Occupation Listed | 147 |
| 17 | oke | rebecca | F | 16 | Anglican | English | Ontario | No Occupation Listed | 147 |
| 18 | oliver | allea | F | 13 | Anglican | English | Ontario | No Occupation Listed | 332 |
| 16 | oliver | ann | F | 34 | Methodist | Irish | Ontario | No Occupation Listed | 140 |
| 13 | oliver | charlotte | F | 48 | Anglican | German | Ontario | No Occupation Listed | 332 |
| 25 | oliver | david | M | 13 | Methodist | English | Ontario | No Occupation Listed | 40 |
| 24 | oliver | elizabeth | F | 15 | Methodist | English | Ontario | No Occupation Listed | 40 |
| 16 | oliver | emmah | F | 22 | Anglican | English | Ontario | Dressmakers | 332 |
| 18 | oliver | flossy | F | 4 | Methodist | English | Ontario | No Occupation Listed | 140 |
| 17 | oliver | james | M | 15 | Anglican | English | Ontario | No Occupation Listed | 332 |
| 22 | oliver | john | M | 20 | Reformed Baptist | English | Ontario | Farmers, general and nfs | 40 |
| 14 | oliver | john | M | 20 | Anglican | English | Ontario | Coach, carriage, cart and wagon makers | 332 |
| 17 | oliver | joseph | M | 11 | Methodist | English | Ontario | No Occupation Listed | 140 |
| 19 | oliver | louis | M | 4 | Anglican | English | Ontario | No Occupation Listed | 332 |
| 23 | oliver | matilda | F | 18 | Methodist | English | Ontario | No Occupation Listed | 40 |
| 21 | oliver | nancy | F | 50 | Methodist | German | Ontario | No Occupation Listed | 40 |
| 20 | oliver | robert | M | 52 | Methodist | English | England | Farmers, general and nfs | 40 |
| 15 | oliver | thomas | M | 18 | Anglican | English | Ontario | Blacksmiths | 332 |
| 15 | oliver | william | M | 33 | Methodist | English | Ontario | Coach, carriage, cart and wagon makers | 140 |
| 12 | oliver | william | M | 51 | Anglican | English | England | Coach, carriage, cart and wagon makers | 332 |
| 23 | osborne | minnie | F | 35 | Presbyterian | Scottish | Ontario | No Occupation Listed | 40 |
| 22 | osborne | william | M | 35 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 40 |
| 19 | ovton | sarah | F | 22 | Christian Baptist | English | Ontario | No Occupation Listed | 178 |
| 20 | ovton | wilfred | M | 1 | Christian Baptist | English | Ontario | No Occupation Listed | 178 |
| 18 | ovton | william | M | 25 | Methodist | English | Ontario | Blacksmiths | 178 |