Residents of Seneca — Sub-district G, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 25 | ogle | oliver | M | 26 | Primitive Methodist | Irish | Ontario | Farmers, general and nfs | 408 |
| 1 | ogle | samuel | M | 24 | Primitive Methodist | Irish | Ontario | No Occupation Listed | 408 |
| 20 | old | bella | F | 63 | Methodist | Irish | Ireland | No Occupation Listed | 260 |
| 22 | old | elizabeth | F | 69 | Anglican | English | England | No Occupation Listed | 59 |
| 23 | old | elizabeth | F | 37 | Anglican | English | Ontario | No Occupation Listed | 59 |
| 18 | old | ellen | F | 40 | Methodist | English | England | No Occupation Listed | 436 |
| 22 | old | henritta | F | 24 | Methodist | English | Ontario | No Occupation Listed | 260 |
| 21 | old | james | M | 69 | Anglican | English | England | Farmers, general and nfs | 59 |
| 17 | old | james | M | 33 | Methodist | English | Ontario | Farmers, general and nfs | 436 |
| 21 | old | thomas | M | 27 | Methodist | English | Ontario | Farmers, general and nfs | 260 |
| 5 | oldfield | eva | F | 8 | Methodist | Irish | Ontario | No Occupation Listed | 251 |
| 2 | oldfield | lucinda | F | 35 | Methodist | Irish | Ontario | No Occupation Listed | 251 |
| 4 | oldfield | mary | F | 9 | Methodist | Irish | Ontario | No Occupation Listed | 251 |
| 3 | oldfield | thomas | M | 10 | Methodist | Irish | Ontario | No Occupation Listed | 251 |
| 6 | oldfield | william | M | 5 | Methodist | Irish | Ontario | No Occupation Listed | 251 |
| 1 | oldfield | wm | M | 33 | Methodist | Irish | Ontario | Farmers, general and nfs | 251 |
| 3 | oneil | charles | M | 72 | Anglican | Irish | Ireland | Labourers nfs | 21 |
| 4 | oneil | margret | F | 28 | Anglican | Irish | Ireland | No Occupation Listed | 21 |
| 4 | oneil | rebecca | F | 65 | Anglican | Irish | Ireland | No Occupation Listed | 316 |
| 6 | oriley | bridget | F | 35 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 88 |
| 9 | oriley | bridget | F | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 10 | oriley | catherine | F | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 12 | oriley | elizabeth | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 11 | oriley | james | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 13 | oriley | john | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 7 | oriley | margret | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 8 | oriley | mary | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 5 | oriley | tarrance | M | 45 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 88 |
| 22 | overnd | albert | M | 17 | Anglican | Irish | Ontario | Farmers, general and nfs | 372 |
| 16 | overnd | bella | F | 35 | Anglican | Irish | Ontario | No Occupation Listed | 350 |
| 1 | overnd | charles | M | 12 | Anglican | Irish | Ontario | No Occupation Listed | 87 |
| 24 | overnd | edmond | M | 16 | Anglican | Irish | Ontario | No Occupation Listed | 87 |
| 23 | overnd | elizabeth | F | 38 | Anglican | Irish | Ontario | No Occupation Listed | 87 |
| 25 | overnd | fred | M | 9 | Anglican | Irish | Ontario | No Occupation Listed | 372 |
| 22 | overnd | james | M | 48 | Anglican | Irish | Ireland | Farmers, general and nfs | 87 |
| 21 | overnd | james | M | 19 | Anglican | Irish | Ontario | Farmers, general and nfs | 372 |
| 17 | overnd | jane | F | 5 | Anglican | Irish | Ontario | No Occupation Listed | 350 |
| 20 | overnd | jane | F | 46 | Presbyterian | Irish | Nova Scotia | No Occupation Listed | 372 |
| 4 | overnd | john | M | 76 | Anglican | Irish | Ireland | Labourers nfs | 353 |
| 2 | overnd | margret | F | 10 | Anglican | Irish | Ontario | No Occupation Listed | 87 |
| 3 | overnd | mary | F | 8 | Anglican | Irish | Poland | No Occupation Listed | 87 |
| 24 | overnd | mary | F | 13 | Anglican | Irish | Ontario | No Occupation Listed | 372 |
| 19 | overnd | matilda | F | 0 | Anglican | Irish | Ontario | No Occupation Listed | 350 |
| 25 | overnd | newton | M | 14 | Anglican | Irish | Ontario | No Occupation Listed | 87 |
| 15 | overnd | robert | M | 41 | Anglican | Irish | Ireland | Farmers, general and nfs | 350 |
| 4 | overnd | samuel | M | 3 | Anglican | Irish | Ontario | No Occupation Listed | 87 |
| 23 | overnd | wesley | M | 15 | Anglican | Irish | Ontario | No Occupation Listed | 372 |
| 18 | overnd | william | M | 2 | Anglican | Irish | Ontario | No Occupation Listed | 350 |
| 19 | overnd | william | M | 51 | Anglican | Irish | Ireland | Farmers, general and nfs | 372 |
| 24 | overud | john | M | 25 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 451 |
| 25 | overud | margret | F | 26 | Presbyterian | Irish | Ontario | No Occupation Listed | 451 |