Residents of Montague — Sub-district J, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 11 | obrien | honora | F | 60 | Roman Catholic | Irish | Ireland | No Occupation Listed | 106 |
| 10 | obrien | patk | M | 58 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 106 |
| 16 | obrien | peter | M | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 106 |
| 20 | obrion | corneliius | M | 97 | Roman Catholic | Irish | Ireland | No Occupation Listed | 80 |
| 19 | obrion | joanna | F | 60 | Roman Catholic | Irish | Ireland | No Occupation Listed | 80 |
| 18 | obrion | timothy | M | 53 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 80 |
| 7 | oconnell | hannah | F | 10 | | Irish | Ontario | No Occupation Listed | 41 |
| 4 | odonnell | anne | F | 20 | | Irish | Ontario | No Occupation Listed | 41 |
| 3 | odonnell | catherine | F | 22 | | Irish | Ontario | No Occupation Listed | 41 |
| 9 | odonnell | catherine | F | 48 | | Irish | Ireland | No Occupation Listed | 42 |
| 6 | odonnell | jane | F | 13 | | Irish | Ontario | No Occupation Listed | 41 |
| 5 | odonnell | jeremiah | M | 19 | | Irish | Ontario | No Occupation Listed | 41 |
| 8 | odonnell | jeremiah | M | 70 | | Irish | Ireland | No Occupation Listed | 42 |
| 2 | odonnell | joseph | M | 27 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 41 |
| 11 | odonnell | lucy | F | 17 | | Irish | Ontario | No Occupation Listed | 42 |
| 10 | odonnell | margaret | F | 14 | | Irish | Ontario | No Occupation Listed | 42 |
| 20 | ormrod | alis | F | 2 | Anglican | Irish | Ontario | No Occupation Listed | 26 |
| 19 | ormrod | clarah | F | 3 | Anglican | Irish | Ontario | No Occupation Listed | 26 |
| 18 | ormrod | elizabeth | F | 23 | Anglican | Irish | Ontario | No Occupation Listed | 26 |
| 17 | ormrod | john | M | 23 | Anglican | English | Ontario | Farmers, general and nfs | 26 |
| 21 | ormrod | mary | F | 0 | Anglican | Irish | Ontario | No Occupation Listed | 26 |