Residents of Wawanosh W-O — Sub-district E, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 21 | ocallaghn | daniel | M | 20 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 149 |
| 23 | ocallaghn | ellen | F | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 149 |
| 22 | ocallaghn | george | M | 19 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 149 |
| 25 | ocallaghn | maggie | F | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 149 |
| 20 | ocallaghn | mary | F | 46 | Roman Catholic | Irish | Ontario | No Occupation Listed | 149 |
| 19 | ocallaghn | patric | M | 48 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 149 |
| 24 | ocallaghn | william | M | 16 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 149 |
| 25 | ockley | lawson | M | 26 | Primitive Methodist | English | England | Ministers of Religion | 146 |
| 24 | oconnor | john | M | 28 | Roman Catholic | Irish | Ireland | Ministers of Religion | 16 |
| 17 | oconnor | john | M | 24 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 33 |
| 18 | oconnor | mary | F | 22 | Roman Catholic | Irish | Ontario | No Occupation Listed | 33 |
| 16 | oconnor | patric | M | 29 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 33 |
| 19 | olaclin | barney | M | 20 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 165 |
| 18 | olaclin | bridget | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 165 |
| 10 | olaclin | catherine | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 167 |
| 21 | olaclin | dennis | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 165 |
| 9 | olaclin | elizebeth | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 167 |
| 1 | olaclin | ellen | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 165 |
| 12 | olaclin | james | M | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 167 |
| 23 | olaclin | margret | F | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 165 |
| 25 | olaclin | martin | M | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 165 |
| 7 | olaclin | martin | M | 36 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 167 |
| 11 | olaclin | martin | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 167 |
| 22 | olaclin | mary | F | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 165 |
| 8 | olaclin | mary | F | 34 | Roman Catholic | Irish | Ontario | No Occupation Listed | 167 |
| 20 | olaclin | peter | M | 16 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 165 |
| 17 | olaclin | sarah | F | 40 | Roman Catholic | Irish | Ontario | No Occupation Listed | 165 |
| 16 | olaclin | thomas | M | 52 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 165 |
| 24 | olaclin | william | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 165 |
| 1 | oleary | margret | F | 30 | Roman Catholic | Irish | Ontario | No Occupation Listed | 16 |
| 8 | oliver | francis | M | 18 | Episcopal Methodist | Irish | Ontario | Farmers, general and nfs | 106 |
| 4 | oliver | margret | F | 55 | Episcopal Methodist | Irish | Ireland | Farmers, general and nfs | 106 |
| 10 | oliver | margret | F | 13 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 106 |
| 5 | oliver | samuel | M | 25 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 106 |
| 9 | oliver | sarah | F | 15 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 106 |
| 6 | oliver | wellington | M | 23 | Episcopal Methodist | Irish | Ontario | Farmers, general and nfs | 106 |
| 7 | oliver | william | M | 21 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 106 |
| 24 | oneal | margret | F | 23 | Roman Catholic | Irish | United States | No Occupation Listed | 104 |
| 15 | orr | annie | F | 24 | Anglican | Irish | Ontario | No Occupation Listed | 179 |
| 14 | orr | ratchel | F | 49 | Anglican | Irish | Ireland | No Occupation Listed | 179 |
| 13 | orr | william | M | 62 | Anglican | Irish | Ireland | Farmers, general and nfs | 179 |