Residents of Eldon — Sub-district A, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 4 | oconor | agnes | F | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 114 |
| 1 | oconor | francis | M | 33 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 114 |
| 2 | oconor | josephine | F | 26 | Roman Catholic | French | Ontario | No Occupation Listed | 114 |
| 5 | oconor | lucy | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 114 |
| 3 | oconor | mariann | F | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 114 |
| 17 | odonell | helen | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 184 |
| 14 | odonell | james | M | 57 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 184 |
| 15 | odonell | mary | F | 57 | Roman Catholic | Irish | Ireland | No Occupation Listed | 184 |
| 16 | odonell | patrick | M | 23 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 184 |
| 21 | oneal | anestesce | F | 56 | Roman Catholic | Irish | Ireland | No Occupation Listed | 264 |
| 22 | oneil | anestesce | F | 18 | Roman Catholic | Irish | Ireland | No Occupation Listed | 264 |
| 20 | oneil | micheal | M | 60 | Roman Catholic | Irish | Ireland | Postmasters and postmistresses | 264 |
| 14 | onre | hugh | M | 23 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 245 |
| 15 | onre | jessie | F | 14 | Presbyterian | Scottish | Ontario | No Occupation Listed | 245 |
| 13 | onre | keneth | M | 42 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 245 |
| 12 | orne | isabella | F | 62 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 245 |