Residents of Sullivan — Sub-district D, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 22 | ogllfeskie | minnie | F | 10 | Lutheran | German | Ontario | No Occupation Listed | 128 |
| 17 | ohara | ann | F | 44 | Roman Catholic | Irish | Ireland | No Occupation Listed | 125 |
| 21 | ohara | annie | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 24 | ohara | cathrin | F | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 16 | ohara | charles | M | 60 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 125 |
| 18 | ohara | charles | M | 19 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 125 |
| 22 | ohara | ellen | F | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 19 | ohara | james | M | 17 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 125 |
| 20 | ohara | john | M | 15 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 125 |
| 23 | ohara | margret | F | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 25 | ohara | mary | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 23 | olbrcht | amy | F | 14 | Lutheran | German | Ontario | No Occupation Listed | 213 |
| 22 | olbrcht | caroline | F | 37 | Lutheran | German | Germany | No Occupation Listed | 213 |
| 21 | olbrcht | edward | M | 38 | Lutheran | German | Germany | Farmers, general and nfs | 213 |
| 24 | olbrcht | luther | M | 13 | Lutheran | German | Ontario | No Occupation Listed | 213 |
| 25 | olbrcht | moses | M | 10 | Lutheran | German | Ontario | No Occupation Listed | 213 |
| 2 | olbright | david | M | 7 | Lutheran | German | Ontario | No Occupation Listed | 213 |
| 4 | olbright | joseph | M | 3 | Lutheran | German | Ontario | No Occupation Listed | 213 |
| 1 | olbright | mary | F | 9 | Lutheran | German | Ontario | No Occupation Listed | 213 |
| 3 | olbright | rebecca | F | 6 | Lutheran | German | Ontario | No Occupation Listed | 213 |
| 5 | olbright | sarah | F | 1 | Lutheran | German | Ontario | No Occupation Listed | 213 |
| 3 | oliver | henery | M | 39 | Wesleyan Methodist | Irish | Ontario | Farmers, general and nfs | 395 |
| 2 | oliver | john | M | 40 | Wesleyan Methodist | Irish | Ontario | Farmers, general and nfs | 394 |
| 7 | oliver | john | M | 7 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 395 |
| 8 | oliver | margret | F | 4 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 395 |
| 10 | oliver | mary | F | 60 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 307 |
| 11 | oliver | mary | F | 24 | Wesleyan Methodist | Irish | Ireland | No Occupation Listed | 307 |
| 5 | oliver | mary | F | 12 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 395 |
| 9 | oliver | moad | F | 2 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 395 |
| 4 | oliver | racheal | F | 32 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 395 |
| 6 | oliver | racheal | F | 11 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 395 |
| 9 | oliver | wesley | M | 27 | Wesleyan Methodist | Irish | Ontario | Farmers, general and nfs | 307 |
| 7 | oneil | john | M | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 67 |
| 5 | oneil | margret | F | 46 | Roman Catholic | Irish | United States | No Occupation Listed | 67 |
| 9 | oneil | margret | F | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 67 |
| 4 | oneil | michael | M | 61 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 67 |
| 6 | oneil | patrick | M | 22 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 67 |
| 8 | oneil | richard | M | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 67 |
| 12 | orpin | henry | M | 50 | Anglican | Irish | Ireland | Farmers, general and nfs | 99 |
| 4 | orr | ann | F | 8 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 11 |
| 3 | orr | margret | F | 12 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 11 |
| 1 | orr | matthew | M | 41 | Wesleyan Methodist | Irish | Ireland | river drivers | 11 |
| 2 | orr | susan | F | 34 | Wesleyan Methodist | Irish | Ireland | No Occupation Listed | 11 |
| 23 | osburn | clara | F | 20 | Presbyterian | Scottish | Ontario | No Occupation Listed | 212 |
| 25 | osburn | fanney | F | 13 | Presbyterian | Scottish | Ontario | No Occupation Listed | 212 |
| 20 | osburn | george | M | 26 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 212 |
| 1 | osburn | james | M | 9 | | Scottish | — | No Occupation Listed | 212 |
| 22 | osburn | jennet | F | 55 | Presbyterian | Scottish | Ontario | No Occupation Listed | 212 |
| 21 | osburn | mary | F | 26 | Presbyterian | Scottish | Ontario | No Occupation Listed | 212 |
| 24 | osburn | welington | M | 15 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 212 |