Residents of Derby — Sub-district E, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 15 | oconnor | anne | F | 62 | Roman Catholic | Irish | Ireland | No Occupation Listed | 195 |
| 20 | oconnor | catherine | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 195 |
| 22 | oconnor | elizabeth | F | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 195 |
| 17 | oconnor | james | M | 26 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 195 |
| 21 | oconnor | john | M | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 195 |
| 18 | oconnor | mary | F | 24 | Roman Catholic | Irish | Ontario | Dressmakers | 195 |
| 16 | oconnor | sarah | F | 28 | Roman Catholic | Irish | Ontario | Dressmakers | 195 |
| 14 | oconnor | william | M | 62 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 195 |
| 19 | oconnor | william | M | 22 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 195 |
| 4 | oliver | agnes | F | 21 | Presbyterian | Scottish | Ontario | No Occupation Listed | 33 |
| 2 | oliver | james | M | 67 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 33 |
| 1 | oliver | john | M | 23 | Anglican | Irish | Ontario | Farmers, general and nfs | 174 |
| 9 | oliver | josephine | F | 5 | Presbyterian | Scottish | Ontario | No Occupation Listed | 33 |
| 6 | oliver | martha | F | 12 | Presbyterian | Scottish | Ontario | No Occupation Listed | 33 |
| 3 | oliver | mary | F | 45 | Presbyterian | English | Ontario | No Occupation Listed | 33 |
| 8 | oliver | mary | F | 8 | Presbyterian | Scottish | Ontario | No Occupation Listed | 33 |
| 5 | oliver | samuel | M | 14 | Presbyterian | Scottish | Ontario | No Occupation Listed | 33 |
| 7 | oliver | sarah | F | 10 | Presbyterian | Scottish | Ontario | No Occupation Listed | 33 |
| 1 | opeil | bridget | F | 70 | Roman Catholic | Irish | Ireland | No Occupation Listed | 1 |
| 16 | ormandy | alice | F | 10 | Anglican | English | Ontario | No Occupation Listed | 69 |
| 15 | ormandy | elizabeth | F | 58 | Anglican | English | England | No Occupation Listed | 69 |
| 17 | ormandy | john | M | 16 | Anglican | English | Ontario | Farmers, general and nfs | 69 |
| 19 | ormandy | margaret | F | 26 | Anglican | Irish | Ontario | No Occupation Listed | 70 |
| 18 | ormandy | thomas | M | 27 | Anglican | English | Ontario | Farmers, general and nfs | 70 |
| 14 | ormandy | william | M | 64 | Anglican | English | England | Manufacturers | 69 |
| 18 | owan | john | M | 18 | Episcopal Methodist | English | Ontario | Labourers nfs | 151 |