Residents of Owen Sound, C — Sub-district A, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 12 | oat | annie | F | 21 | Presbyterian | Scottish | Scotland | No Occupation Listed | 70 |
| 10 | oat | cathrine | F | 43 | Presbyterian | Scottish | Scotland | No Occupation Listed | 70 |
| 16 | oat | charles | M | 6 | Presbyterian | Scottish | Ontario | No Occupation Listed | 70 |
| 17 | oat | francis | M | 3 | Presbyterian | Scottish | Ontario | No Occupation Listed | 70 |
| 9 | oat | james | M | 52 | Presbyterian | Scottish | Scotland | Millwrights | 70 |
| 11 | oat | james | M | 23 | Presbyterian | Scottish | Scotland | Dealer, merchant etc. (Wholesale & retail trade) | 70 |
| 13 | oat | kate | F | 18 | Presbyterian | Scottish | Ontario | No Occupation Listed | 70 |
| 14 | oat | margaret | F | 15 | Presbyterian | Scottish | Ontario | No Occupation Listed | 70 |
| 15 | oat | william | M | 11 | Presbyterian | Scottish | Ontario | No Occupation Listed | 70 |
| 11 | ocallachan | ann | F | 18 | Roman Catholic | Irish | Ontario | Servants nfs | 249 |
| 8 | oconnell | james | M | 18 | Baptist | Scottish | Ontario | Labourers nfs | 74 |
| 6 | oconner | susan | F | 35 | Anglican | Irish | Ontario | No Occupation Listed | 52 |
| 5 | oconner | william | M | 41 | Anglican | Irish | Ireland | Teachers (unspecified) | 52 |
| 8 | oconnor | arthur | M | 11 | Anglican | Irish | Ontario | No Occupation Listed | 52 |
| 10 | oconnor | beatrice | F | 5 | Anglican | Irish | Ontario | No Occupation Listed | 52 |
| 9 | oconnor | frederick | M | 9 | Anglican | Irish | Ontario | No Occupation Listed | 52 |
| 7 | oconnor | nellie | F | 13 | Anglican | Irish | Ontario | No Occupation Listed | 52 |
| 9 | odonohu | peter | M | 35 | Roman Catholic | Irish | Ireland | Ministers of Religion | 249 |
| 25 | offered | alexander | M | 9 | Anglican | English | England | No Occupation Listed | 226 |
| 1 | offered | daniel | M | 6 | Anglican | English | England | No Occupation Listed | 226 |
| 23 | offered | mary | F | 14 | Anglican | English | England | No Occupation Listed | 226 |
| 21 | offered | moses | M | 40 | Anglican | English | England | Labourers nfs | 226 |
| 24 | offered | moses | M | 11 | Anglican | English | England | No Occupation Listed | 226 |
| 22 | offered | sarah | F | 35 | Anglican | English | England | Labourers nfs | 226 |
| 2 | offered | william | M | 5 | Anglican | English | England | No Occupation Listed | 226 |
| 1 | ohare | annie | F | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 212 |
| 2 | ohare | denis | M | 10 | Roman Catholic | Blank | Ontario | No Occupation Listed | 212 |
| 4 | ohare | ellen | F | 7 | Roman Catholic | Blank | Ontario | No Occupation Listed | 212 |
| 24 | ohare | john | M | 37 | Roman Catholic | Irish | Ontario | Spinners and winders | 212 |
| 5 | ohare | john | M | 5 | Roman Catholic | Blank | Ontario | No Occupation Listed | 212 |
| 6 | ohare | margaret | F | 3 | Roman Catholic | Blank | Ontario | No Occupation Listed | 212 |
| 25 | ohare | mary | F | 36 | Anglican | English | Ontario | No Occupation Listed | 212 |
| 3 | ohare | minney | F | 8 | Roman Catholic | Blank | Ontario | No Occupation Listed | 212 |
| 7 | ohare | william | M | 1 | Roman Catholic | Blank | Ontario | No Occupation Listed | 212 |
| 25 | oliver | dhu | M | 10 | Baptist | Irish | Ontario | No Occupation Listed | 224 |
| 24 | oliver | mary | F | 41 | Baptist | Scottish | Ontario | No Occupation Listed | 224 |
| 23 | oliver | robert | M | 44 | Baptist | Irish | Ontario | Carpenters | 224 |
| 10 | ormiston | elizabeth | F | 38 | Presbyterian | Scottish | Scotland | No Occupation Listed | 314 |
| 11 | ormiston | elizabeth | F | 1 | Presbyterian | Scottish | Ontario | No Occupation Listed | 314 |
| 9 | ormiston | william | M | 40 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 314 |
| 13 | ovans | george | M | 23 | Roman Catholic | Irish | Ontario | Servants nfs | 249 |