Residents of Yorkville, Village — Sub-district D, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 4 | oates | clara | F | 20 | Anglican | English | Ontario | No Occupation Listed | 194 |
| 2 | oates | edward | M | 30 | Anglican | English | Ontario | Bookkeepers nfs | 194 |
| 1 | oates | emily | F | 32 | Anglican | English | Ontario | No Occupation Listed | 194 |
| 25 | oates | mary | F | 60 | Anglican | Irish | Ireland | No Occupation Listed | 194 |
| 3 | oates | william | M | 28 | Anglican | English | Ontario | Merchants, specified large-scale wholesaleing | 194 |
| 12 | obrien | albert | M | 14 | Roman Catholic | Irish | Quebec | Machinists | 28 |
| 20 | obrien | annie | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 116 |
| 11 | obrien | catherine | F | 38 | Roman Catholic | Irish | Ireland | No Occupation Listed | 28 |
| 18 | obrien | dennis | M | 28 | Roman Catholic | Irish | Ontario | Clerk, nfs | 116 |
| 19 | obrien | ellen | F | 24 | Roman Catholic | Irish | Ontario | No Occupation Listed | 116 |
| 14 | obrien | george | M | 10 | Roman Catholic | Irish | Malta | No Occupation Listed | 28 |
| 13 | obrien | herbert | M | 13 | Roman Catholic | Irish | Malta | No Occupation Listed | 28 |
| 12 | obrien | maggie | F | 22 | Roman Catholic | Irish | Ontario | Dressmakers | 61 |
| 10 | obrien | michael | M | 43 | Roman Catholic | Irish | Ireland | Labourers nfs | 28 |
| 19 | obrien | michael | M | 45 | Roman Catholic | Irish | Ireland | Labourers nfs | 115 |
| 21 | oconnor | sarah | F | 54 | Anglican | English | Ontario | No Occupation Listed | 137 |
| 4 | ofrady | catherine | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 1 |
| 16 | oleary | lewis | M | 60 | Roman Catholic | Irish | Ireland | Labourers nfs | 762 |
| 17 | oleary | mary | F | 60 | Roman Catholic | Irish | Ireland | No Occupation Listed | 762 |
| 17 | oliver | clara | F | 30 | Methodist | French | Ontario | No Occupation Listed | 146 |
| 16 | oliver | jane | F | 72 | Methodist | French | England | No Occupation Listed | 146 |
| 24 | oniel | margaret | F | 21 | Roman Catholic | Irish | Ireland | Servants nfs | 682 |
| 23 | oram | florence | F | 0 | Methodist | English | Ontario | No Occupation Listed | 147 |
| 21 | oram | george | M | 4 | Methodist | English | Ontario | No Occupation Listed | 147 |
| 20 | oram | jane | F | 32 | Methodist | English | Ireland | No Occupation Listed | 147 |
| 22 | oram | jane | F | 3 | Methodist | English | Ontario | No Occupation Listed | 147 |
| 19 | oram | john | M | 34 | Methodist | English | England | Tinsmiths and Tinners and Tinkers | 147 |
| 17 | orr | mary | F | 29 | Methodist | English | England | No Occupation Listed | 170 |
| 7 | osborne | ethel | F | 1 | Congregationalist | English | Ontario | No Occupation Listed | 310 |
| 8 | osborne | julia | F | 26 | Congregationalist | English | England | No Occupation Listed | 310 |
| 6 | osborne | lily | F | 10 | Congregationalist | English | England | No Occupation Listed | 310 |
| 5 | osborne | maria | F | 35 | Congregationalist | English | England | No Occupation Listed | 310 |
| 4 | osborne | william | M | 33 | Congregationalist | English | England | Bleachers, dyer or textile product finisher | 310 |
| 21 | oulcott | fred | M | 1 | Methodist | English | Ontario | No Occupation Listed | 414 |
| 18 | oulcott | harriet | F | 16 | Methodist | English | Ontario | No Occupation Listed | 414 |
| 17 | oulcott | jane | F | 38 | Methodist | English | Ontario | No Occupation Listed | 414 |
| 16 | oulcott | john | M | 42 | Anglican | English | England | Hotel Keepers and Managers | 414 |
| 20 | oulcott | martha | F | 5 | Methodist | English | Ontario | No Occupation Listed | 414 |
| 19 | oulcott | mary | F | 14 | Methodist | English | Ontario | No Occupation Listed | 414 |
| 1 | outhwaite | edward | M | 34 | Methodist | English | England | Tinsmiths and Tinners and Tinkers | 567 |
| 4 | outhwaite | lizzie | F | 2 | Methodist | English | Ontario | No Occupation Listed | 567 |
| 2 | outhwaite | mary | F | 30 | Presbyterian | Scottish | Ontario | No Occupation Listed | 567 |
| 3 | outhwaite | william | M | 11 | Methodist | English | Ontario | No Occupation Listed | 567 |