Residents of Cumberland — Sub-district C, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 17 | obrine | robert | M | 50 | Anglican | Irish | Ireland | Labourers nfs | 44 |
| 24 | odonnell | fredrick | M | 6 | Presbyterian | Irish | Ontario | No Occupation Listed | 183 |
| 1 | odonnell | hattie | F | 3 | Presbyterian | Irish | Ontario | No Occupation Listed | 183 |
| 25 | odonnell | jessie | F | 5 | Presbyterian | Irish | Ontario | No Occupation Listed | 183 |
| 22 | odonnell | joseph | M | 40 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 183 |
| 2 | odonnell | lettie | F | 1 | Presbyterian | Irish | Ontario | No Occupation Listed | 183 |
| 23 | odonnell | maria | F | 39 | Presbyterian | Irish | Ontario | No Occupation Listed | 183 |
| 7 | olmstead | abraham | M | 52 | Methodist | English | Quebec | Farmers, general and nfs | 179 |
| 13 | olmstead | abraham | M | 14 | Methodist | English | Ontario | No Occupation Listed | 179 |
| 8 | olmstead | amielie | F | 48 | Methodist | Irish | Quebec | No Occupation Listed | 179 |
| 12 | olmstead | ann | F | 17 | Methodist | English | Ontario | No Occupation Listed | 179 |
| 10 | olmstead | george | M | 21 | Methodist | English | Ontario | Farmers, general and nfs | 179 |
| 9 | olmstead | gidion | M | 23 | Methodist | English | Ontario | Farmers, general and nfs | 179 |
| 14 | olmstead | henery | M | 13 | Methodist | English | Ontario | No Occupation Listed | 179 |
| 16 | olmstead | henery | M | 7 | Methodist | English | Ontario | No Occupation Listed | 179 |
| 11 | olmstead | joseph | M | 19 | Methodist | English | Ontario | No Occupation Listed | 179 |
| 15 | olmstead | mary | F | 10 | Methodist | English | Ontario | No Occupation Listed | 179 |
| 17 | olmstead | parker | M | 1 | Methodist | English | Ontario | No Occupation Listed | 179 |
| 7 | omara | annie | F | 34 | Roman Catholic | Irish | Ireland | No Occupation Listed | 126 |
| 6 | omara | james | M | 37 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 126 |
| 12 | omara | james | M | 3 | Roman Catholic | Irish | Ireland | No Occupation Listed | 126 |
| 13 | omara | julie | F | 0 | Roman Catholic | Irish | Ireland | No Occupation Listed | 126 |
| 9 | omara | lilie | F | 9 | Roman Catholic | Irish | Ireland | No Occupation Listed | 126 |
| 10 | omara | margratt | F | 7 | Roman Catholic | Irish | Ireland | No Occupation Listed | 126 |
| 8 | omara | mickel | M | 10 | Roman Catholic | Irish | Ireland | No Occupation Listed | 126 |
| 11 | omara | thomas | M | 5 | Roman Catholic | Irish | Ireland | No Occupation Listed | 126 |
| 8 | orr | ann | F | 52 | Presbyterian | Scottish | Scotland | No Occupation Listed | 12 |
| 9 | orr | james | M | 26 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 12 |
| 11 | orr | mary | F | 18 | Presbyterian | Scottish | Ontario | No Occupation Listed | 12 |
| 10 | orr | robert | M | 22 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 12 |
| 7 | orr | william | M | 60 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 12 |
| 7 | orton | anastasia | F | 12 | Presbyterian | Irish | Ontario | No Occupation Listed | 20 |
| 8 | orton | clara | F | 5 | Presbyterian | Irish | Ontario | No Occupation Listed | 20 |
| 19 | orton | james | M | 22 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 21 |
| 4 | orton | john | M | 45 | Presbyterian | Irish | United States | river drivers | 20 |
| 5 | orton | mary | F | 32 | Presbyterian | Irish | Ireland | No Occupation Listed | 20 |
| 6 | orton | mary | F | 14 | Presbyterian | Irish | Ontario | No Occupation Listed | 20 |
| 25 | otoole | ann | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 284 |
| 24 | otoole | annie | F | 31 | Roman Catholic | Irish | Quebec | No Occupation Listed | 284 |
| 11 | otoole | catherine | F | 50 | Roman Catholic | Irish | Ireland | No Occupation Listed | 158 |
| 13 | otoole | catherine | F | 31 | Roman Catholic | Irish | United States | No Occupation Listed | 158 |
| 20 | otoole | catherine | F | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 175 |
| 6 | otoole | edward | M | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 157 |
| 18 | otoole | elizabeth | F | 23 | Roman Catholic | Irish | Ontario | No Occupation Listed | 175 |
| 9 | otoole | ellen | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 157 |
| 1 | otoole | ellen | F | 70 | Roman Catholic | Irish | Ireland | No Occupation Listed | 284 |
| 8 | otoole | george | M | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 157 |
| 7 | otoole | james | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 157 |
| 19 | otoole | james | M | 21 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 175 |
| 16 | otoole | jane | F | 59 | Roman Catholic | Irish | Ireland | No Occupation Listed | 175 |
| 5 | otoole | margret | F | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 157 |
| 17 | otoole | margret | F | 26 | Roman Catholic | Irish | Ontario | Seamstress | 175 |
| 12 | otoole | mary | F | 33 | Roman Catholic | Irish | United States | No Occupation Listed | 158 |
| 2 | otoole | michael | M | 38 | Roman Catholic | Irish | Ontario | Labourers nfs | 157 |
| 4 | otoole | michael | M | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 157 |
| 14 | otoole | michael | M | 29 | Roman Catholic | Irish | United States | Farmers, general and nfs | 158 |
| 15 | otoole | patrick | M | 56 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 175 |
| 23 | otoole | peter | M | 35 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 284 |
| 3 | otoole | sarah | F | 34 | Roman Catholic | Irish | Quebec | No Occupation Listed | 157 |
| 10 | otoole | thomas | M | 62 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 158 |
| 15 | otoole | thomas | M | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 158 |