Residents of Sunnidale — Sub-district D, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 22 | oconnell | catherin | F | 40 | Roman Catholic | Irish | Ontario | No Occupation Listed | 70 |
| 21 | oconnell | john | M | 40 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 70 |
| 5 | ogilvie | amas | M | 14 | Christian | Scottish | Ontario | No Occupation Listed | 272 |
| 8 | ogilvie | annie | F | 6 | Christian | Scottish | Ontario | No Occupation Listed | 272 |
| 6 | ogilvie | hester | F | 13 | Christian | Scottish | Ontario | No Occupation Listed | 272 |
| 3 | ogilvie | hugh | M | 34 | Christian | Scottish | Ontario | Farmers, general and nfs | 272 |
| 9 | ogilvie | margret | F | 4 | Christian | Scottish | Ontario | No Occupation Listed | 272 |
| 4 | ogilvie | mary | F | 33 | Christian | Scottish | Ontario | No Occupation Listed | 272 |
| 7 | ogilvie | minnie | F | 11 | Christian | Scottish | Ontario | No Occupation Listed | 272 |
| 10 | ogilvie | nina | F | 3 | Christian | Scottish | Ontario | No Occupation Listed | 272 |
| 13 | oliver | annie | F | 13 | Presbyterian | Scottish | Ontario | No Occupation Listed | 273 |
| 15 | oliver | hiram | M | 6 | Presbyterian | Scottish | Ontario | No Occupation Listed | 273 |
| 14 | oliver | john | M | 10 | Presbyterian | Scottish | Ontario | No Occupation Listed | 273 |
| 11 | oliver | robert | M | 37 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 273 |
| 12 | oliver | sarah | F | 37 | Presbyterian | German | Ontario | No Occupation Listed | 273 |
| 16 | oliver | sarah | F | 3 | Presbyterian | Scottish | Ontario | No Occupation Listed | 273 |
| 2 | orr | anne | F | 5 | Methodist | Scottish | Ontario | No Occupation Listed | 478 |
| 6 | orr | james | M | 31 | Presbyterian | Scottish | Scotland | No Occupation Listed | 153 |
| 4 | orr | john | M | 58 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 153 |
| 7 | orr | john | M | 23 | Presbyterian | Scottish | Ontario | Farriers and Horseshoers | 153 |
| 1 | orr | john | M | 6 | Methodist | Scottish | Ontario | No Occupation Listed | 478 |
| 5 | orr | lavina | F | 60 | Methodist | Irish | Ontario | No Occupation Listed | 153 |
| 8 | orr | mary | F | 21 | Presbyterian | Scottish | Ontario | No Occupation Listed | 153 |
| 25 | orr | sharlet | F | 25 | Methodist | English | Ontario | No Occupation Listed | 478 |
| 24 | orr | william | M | 35 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 478 |
| 3 | orr | william | M | 0 | Methodist | Scottish | Ontario | No Occupation Listed | 478 |
| 17 | osier | agian | F | 5 | Roman Catholic | French | Ontario | No Occupation Listed | 60 |
| 16 | osier | ann | F | 6 | Roman Catholic | French | Ontario | No Occupation Listed | 60 |
| 22 | osier | delaino | F | 13 | Roman Catholic | French | Ontario | No Occupation Listed | 61 |
| 18 | osier | elin | F | 3 | Roman Catholic | French | Ontario | No Occupation Listed | 60 |
| 24 | osier | henry | M | 6 | Roman Catholic | French | Ontario | No Occupation Listed | 61 |
| 4 | osier | james | M | 15 | Roman Catholic | French | Ontario | No Occupation Listed | 62 |
| 7 | osier | john | M | 7 | Roman Catholic | French | Ontario | No Occupation Listed | 62 |
| 13 | osier | joseph | M | 31 | Roman Catholic | French | Quebec | Labourers nfs | 60 |
| 8 | osier | joseph | M | 0 | Roman Catholic | French | Ontario | No Occupation Listed | 62 |
| 15 | osier | leon | M | 8 | Roman Catholic | French | Ontario | No Occupation Listed | 60 |
| 25 | osier | lewisa | F | 3 | Roman Catholic | French | Ontario | No Occupation Listed | 61 |
| 21 | osier | lewsie | F | 37 | Roman Catholic | French | Quebec | No Occupation Listed | 61 |
| 11 | osier | lillian | F | 2 | Methodist | Scottish | Ontario | No Occupation Listed | 78 |
| 19 | osier | lora | F | 1 | Roman Catholic | French | Ontario | No Occupation Listed | 60 |
| 10 | osier | lottie | F | 22 | Methodist | Scottish | Ontario | No Occupation Listed | 78 |
| 6 | osier | matilda | F | 10 | Roman Catholic | French | Ontario | No Occupation Listed | 62 |
| 3 | osier | medeena | F | 22 | Roman Catholic | French | Quebec | No Occupation Listed | 62 |
| 2 | osier | nelson | M | 44 | Roman Catholic | French | Quebec | Farmers, general and nfs | 62 |
| 14 | osier | olive | F | 26 | Roman Catholic | French | Quebec | No Occupation Listed | 60 |
| 5 | osier | sycilenore | F | 12 | Roman Catholic | French | Ontario | No Occupation Listed | 62 |
| 9 | osier | tanese | M | 21 | Roman Catholic | French | Ontario | Labourers nfs | 78 |
| 1 | osier | tannice | M | 0 | Roman Catholic | French | Ontario | No Occupation Listed | 61 |
| 20 | osier | thomas | M | 45 | Roman Catholic | French | Quebec | Labourers nfs | 61 |
| 23 | osier | thomas | M | 9 | Roman Catholic | French | Ontario | No Occupation Listed | 61 |
| 6 | osman | daniel | M | 30 | Methodist | German | Ontario | Farmers, general and nfs | 461 |
| 4 | osman | jacop | M | 71 | Methodist | German | Ontario | Farmers, general and nfs | 461 |
| 5 | osman | mariah | F | 61 | Methodist | Irish | Ireland | No Occupation Listed | 461 |
| 8 | osman | sarah | F | 25 | Methodist | German | Ontario | No Occupation Listed | 461 |
| 7 | osman | william | M | 26 | Methodist | German | Ontario | No Occupation Listed | 461 |