Residents of York W-O — Sub-district F, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 15 | obrien | betsey | F | 62 | Roman Catholic | Irish | Ireland | No Occupation Listed | 18 |
| 22 | obrien | bridget | F | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 59 |
| 2 | obrien | edenia | F | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 20 |
| 16 | obrien | edward | M | 40 | Roman Catholic | Irish | Ireland | Labourers nfs | 18 |
| 20 | obrien | margaret | F | 57 | Roman Catholic | Irish | Ireland | No Occupation Listed | 59 |
| 21 | obrien | mary | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 59 |
| 1 | obrien | mary | F | 30 | Roman Catholic | Irish | Ontario | No Occupation Listed | 20 |
| 11 | obrien | mathew | M | 80 | Roman Catholic | Irish | Ireland | Gardeners nfs | 17 |
| 3 | obrien | mathew | M | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 20 |
| 14 | obrien | michael | M | 70 | Roman Catholic | Irish | Ireland | Labourers nfs | 18 |
| 12 | obrien | sarah | F | 82 | Roman Catholic | Irish | Ireland | No Occupation Listed | 17 |
| 4 | obrien | william | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 20 |
| 2 | obrine | bridget | F | 15 | Roman Catholic | Irish | Ireland | No Occupation Listed | 95 |
| 4 | obrine | bridget | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 71 |
| 25 | obrine | edward | M | 36 | Roman Catholic | Irish | Ireland | Labourers nfs | 20 |
| 6 | obrine | james | M | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 71 |
| 9 | obrine | john | M | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 2 |
| 7 | obrine | john | M | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 71 |
| 16 | obrine | lidge | F | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 116 |
| 5 | obrine | margret | F | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 71 |
| 8 | obrine | mary | F | 32 | Roman Catholic | Irish | Ireland | No Occupation Listed | 2 |
| 25 | obrine | mary | F | 48 | Roman Catholic | Irish | Ireland | No Occupation Listed | 95 |
| 10 | obrine | mary | F | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 71 |
| 10 | obrine | michael | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 2 |
| 8 | obrine | patric | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 71 |
| 7 | obrine | patrick | M | 32 | Roman Catholic | Irish | Ontario | Labourers nfs | 2 |
| 3 | obrine | patrick | M | 55 | Roman Catholic | Irish | Ireland | Labourers nfs | 71 |
| 24 | obrine | thomas | M | 48 | Roman Catholic | Irish | Ireland | Labourers nfs | 95 |
| 3 | obrine | thomas | M | 12 | Roman Catholic | Irish | Ireland | No Occupation Listed | 95 |
| 1 | obrine | william | M | 17 | Roman Catholic | Irish | Ireland | No Occupation Listed | 95 |
| 9 | obrine | william | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 71 |
| 6 | oconnell | julia | F | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 38 |
| 23 | odell | catherine | F | 25 | Anglican | Irish | Ontario | No Occupation Listed | 120 |
| 1 | odell | george | M | 0 | Anglican | Irish | Ontario | No Occupation Listed | 120 |
| 23 | odell | harry | M | 1 | Anglican | Irish | Ontario | No Occupation Listed | 123 |
| 22 | odell | kate | F | 24 | Anglican | Irish | Ontario | No Occupation Listed | 123 |
| 21 | odell | robert | M | 33 | Anglican | Irish | Ireland | Labourers nfs | 123 |
| 22 | odell | robert | M | 35 | Anglican | Irish | Ireland | Servants nfs | 120 |
| 24 | odell | william | M | 1 | Anglican | Irish | Ontario | No Occupation Listed | 120 |
| 7 | ohara | charles | M | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 15 |
| 4 | ohara | eliza | F | 50 | Roman Catholic | Irish | Ireland | No Occupation Listed | 156 |
| 5 | ohara | eliza | F | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 15 |
| 25 | ohara | elizabeth | F | 40 | Anglican | English | Spain | No Occupation Listed | 15 |
| 6 | ohara | james | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 15 |
| 24 | ohara | john | M | 40 | Roman Catholic | Irish | Ireland | Boot and shoemakers and repairers | 15 |
| 2 | ohara | john | M | 15 | Roman Catholic | Irish | United States | No Occupation Listed | 15 |
| 5 | ohara | margaret | F | 20 | Roman Catholic | Irish | Ontario | Servants nfs | 157 |
| 5 | ohara | margareth | F | 20 | Roman Catholic | Irish | Ontario | Servants nfs | 156 |
| 3 | ohara | martha | F | 11 | Roman Catholic | Irish | United States | No Occupation Listed | 15 |
| 6 | ohara | mary | F | 17 | Roman Catholic | Irish | Ontario | Servants nfs | 156 |
| 3 | ohara | michael | M | 48 | Roman Catholic | Irish | Ireland | Labourers nfs | 156 |
| 4 | ohara | michael | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 15 |
| 1 | ohara | william | M | 17 | Roman Catholic | Irish | United States | No Occupation Listed | 15 |
| 8 | ohara | william | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 15 |
| 7 | orean | adam | M | 16 | Presbyterian | Irish | Ontario | No Occupation Listed | 137 |
| 4 | orean | fanney | F | 24 | Presbyterian | Irish | Quebec | No Occupation Listed | 137 |
| 6 | orean | georgena | F | 20 | Presbyterian | Irish | England | Teachers (unspecified) | 137 |
| 25 | orean | jessie | F | 62 | Presbyterian | Scottish | Scotland | No Occupation Listed | 137 |
| 3 | orean | jessie | F | 28 | Presbyterian | Irish | United States | No Occupation Listed | 137 |
| 5 | orean | john | M | 23 | Presbyterian | Irish | Ireland | Tailors and tailoresses | 137 |
| 1 | orean | robert | M | 32 | Presbyterian | Irish | Greece | Manufacturers | 137 |
| 24 | orean | thomas | M | 68 | Presbyterian | Irish | Ireland | Tailors and tailoresses | 137 |
| 2 | orean | thomas | M | 30 | Presbyterian | Irish | Greece | Agent nfs | 137 |
| 9 | orr | allan | M | 52 | Anglican | Irish | Ireland | Carpenters | 35 |
| 17 | orr | catherine | F | 7 | Anglican | Irish | Ontario | No Occupation Listed | 35 |
| 16 | orr | david | M | 10 | Anglican | Irish | Ontario | No Occupation Listed | 35 |
| 17 | orr | elizabeth | F | 50 | Presbyterian | Irish | Ireland | No Occupation Listed | 215 |
| 16 | orr | james | M | 35 | Presbyterian | Irish | Ireland | Farmers, general and nfs | 215 |
| 13 | orr | james | M | 15 | Anglican | Irish | Ireland | No Occupation Listed | 35 |
| 12 | orr | john | M | 21 | Anglican | Irish | Ireland | Teamsters (inc. mine driver, etc.) | 35 |
| 10 | orr | margaret | F | 44 | Anglican | Irish | Ireland | No Occupation Listed | 35 |
| 15 | orr | margaret | F | 13 | Anglican | Irish | Ontario | No Occupation Listed | 35 |
| 11 | orr | mary | F | 23 | Anglican | Irish | Ireland | No Occupation Listed | 35 |
| 14 | orr | sarah | F | 15 | Anglican | Irish | Ireland | No Occupation Listed | 35 |
| 13 | oster | alexander | M | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 9 |
| 11 | oster | francis | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 9 |
| 8 | oster | henry | M | 38 | Roman Catholic | Irish | Ontario | Labourers nfs | 9 |
| 10 | oster | john | M | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 9 |
| 12 | oster | margarett | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 9 |
| 9 | oster | mary | F | 38 | Roman Catholic | Irish | Ontario | No Occupation Listed | 9 |
| 14 | oster | mary | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 9 |
| 25 | oxley | john | M | 31 | Methodist | English | England | Labourers nfs | 56 |
| 1 | oxley | mary | F | 30 | Methodist | Irish | England | No Occupation Listed | 56 |
| 2 | oxley | mary | F | 1 | Methodist | English | Ontario | No Occupation Listed | 56 |