Residents of Caradoc — Sub-district E, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 9 | _oghoko | john | M | 9 | Methodist | Aboriginal peoples, n.s | Ontario | No Occupation Listed | 223 |
| 3 | oak | caroline | F | 26 | Baptist | Norwegian | Ontario | No Occupation Listed | 187 |
| 2 | oak | eliza | F | 29 | Baptist | Norwegian | Ontario | No Occupation Listed | 187 |
| 4 | oak | ellen | F | 28 | Baptist | Norwegian | Ontario | No Occupation Listed | 187 |
| 21 | oak | henry | M | 3 | Baptist | Norwegian | Ontario | No Occupation Listed | 186 |
| 5 | oak | james | M | 19 | Baptist | Norwegian | Ontario | No Occupation Listed | 187 |
| 23 | oak | lawrence | M | 60 | Baptist | Norwegian | Norway | Farmers, general and nfs | 187 |
| 20 | oak | mary | F | 29 | Baptist | Blank | Ontario | No Occupation Listed | 186 |
| 24 | oak | mary | F | 60 | Baptist | Norwegian | Norway | No Occupation Listed | 187 |
| 1 | oak | matilda | F | 31 | Baptist | Norwegian | Ontario | No Occupation Listed | 187 |
| 22 | oak | maud | F | 1 | Baptist | Norwegian | Ontario | No Occupation Listed | 186 |
| 19 | oak | thos | M | 34 | Baptist | Norwegian | Ontario | Farmers, general and nfs | 186 |
| 6 | oak | william | M | 16 | Baptist | Norwegian | Ontario | No Occupation Listed | 187 |
| 3 | oaks | mary | F | 61 | Primitive Methodist | English | England | No Occupation Listed | 138 |
| 5 | oaks | mary | F | 25 | Primitive Methodist | English | Ontario | No Occupation Listed | 138 |
| 2 | oaks | samuel | M | 61 | Primitive Methodist | English | England | Farmers, general and nfs | 138 |
| 4 | oaks | samuel | M | 23 | Primitive Methodist | English | Ontario | Farmers, general and nfs | 138 |
| 6 | oaks | william | M | 3 | Primitive Methodist | English | Ontario | No Occupation Listed | 138 |
| 5 | oconnor | john | M | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 74 |
| 9 | ogilvie | elspet | F | 59 | Presbyterian | Scottish | Scotland | No Occupation Listed | 107 |
| 11 | ogilvie | elspete | F | 22 | Presbyterian | Scottish | Ontario | No Occupation Listed | 107 |
| 7 | ogilvie | george | M | 6 | Presbyterian | Scottish | Ontario | No Occupation Listed | 106 |
| 4 | ogilvie | james | M | 13 | Presbyterian | Scottish | Ontario | No Occupation Listed | 106 |
| 2 | ogilvie | john | M | 37 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 106 |
| 5 | ogilvie | john | M | 11 | Presbyterian | Scottish | Ontario | No Occupation Listed | 106 |
| 10 | ogilvie | margaret | F | 27 | Presbyterian | Scottish | Ontario | No Occupation Listed | 107 |
| 3 | ogilvie | martha | F | 31 | Presbyterian | English | Ontario | No Occupation Listed | 106 |
| 6 | ogilvie | mary | F | 8 | Presbyterian | Scottish | Ontario | No Occupation Listed | 106 |
| 8 | ogilvie | robert | M | 2 | Presbyterian | Scottish | Ontario | No Occupation Listed | 106 |
| 24 | oliver | george | M | 14 | Methodist | Aboriginal peoples, n.s | Ontario | Farmers, general and nfs | 104 |
| 8 | ollett | john | M | 14 | Methodist | English | Ontario | No Occupation Listed | 198 |
| 6 | ollett | mary | F | 73 | Methodist | English | England | No Occupation Listed | 198 |
| 5 | ollett | william | M | 78 | Methodist | English | England | Farmers, general and nfs | 198 |
| 3 | orr | ann | F | 28 | Anglican | Irish | Ontario | No Occupation Listed | 35 |
| 21 | orr | john | M | 10 | Presbyterian | Irish | Ontario | No Occupation Listed | 33 |
| 19 | orr | nancy | F | 73 | Presbyterian | Irish | Ireland | Farmers, general and nfs | 33 |
| 4 | orr | netty | F | 9 | Anglican | Irish | Ontario | No Occupation Listed | 35 |
| 22 | orr | rowland | M | 29 | Anglican | Irish | Ontario | Farmers, general and nfs | 34 |
| 20 | orr | william | M | 41 | Presbyterian | Irish | Ontario | No Occupation Listed | 33 |
| 4 | owins | marey | F | 65 | Methodist | Irish | Ireland | No Occupation Listed | 39 |
| 2 | owins | margaret | F | 26 | Methodist | English | Ontario | No Occupation Listed | 39 |
| 1 | owins | thomas | M | 28 | Methodist | English | Ontario | Farmers, general and nfs | 39 |
| 3 | owins | thomas | M | 89 | Methodist | English | England | No Occupation Listed | 39 |
| 2 | owlet | edward | M | 33 | Methodist | English | Ontario | Farmers, general and nfs | 197 |
| 3 | owlet | elizabeth | F | 25 | Methodist | Irish | Ontario | No Occupation Listed | 197 |
| 4 | owlet | william | M | 1 | Methodist | English | Ontario | No Occupation Listed | 197 |