Residents of Longueuil — Sub-district D, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 21 | o_ | lena | F | 23 | Roman Catholic | French | Ontario | No Occupation Listed | 168 |
| 20 | o_ | william | M | 32 | Disciple of Christ | Irish | Ontario | barrister | 168 |
| 23 | o_ | william | M | 0 | Huguenot | Irish | Ontario | No Occupation Listed | 168 |
| 22 | o__ | peter | M | 3 | Huguenot | Irish | Ontario | No Occupation Listed | 168 |
| 24 | oiellett | ambroise | M | 8 | Roman Catholic | French | Quebec | No Occupation Listed | 137 |
| 1 | oiellett | armidas | M | 4 | Roman Catholic | French | Quebec | No Occupation Listed | 137 |
| 22 | oiellett | hilina | F | 31 | Roman Catholic | French | Quebec | No Occupation Listed | 137 |
| 21 | oiellett | joseph | M | 32 | Roman Catholic | French | Quebec | Servants nfs | 137 |
| 23 | oiellett | joseph | M | 9 | Roman Catholic | French | Quebec | No Occupation Listed | 137 |
| 2 | oiellett | marie | F | 1 | Roman Catholic | French | Quebec | No Occupation Listed | 137 |
| 25 | oiellett | philomine | F | 7 | Roman Catholic | French | Quebec | No Occupation Listed | 137 |