Residents of Salaberry de Valleyfield, Town—Ville — Sub-district A, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 23 | oare | alphmoine | F | 30 | Roman Catholic | French | Quebec | No Occupation Listed | 23 |
| 7 | oatley | addie | F | 27 | Methodist | Blank | Quebec | No Occupation Listed | 689 |
| 3 | oatley | arthur | M | 50 | Methodist | Blank | United States | Watchmen and guards | 688 |
| 6 | oatley | charles | M | 26 | Methodist | Blank | United States | Watchmen and guards | 689 |
| 4 | oatley | clara | F | 44 | Methodist | Blank | United States | No Occupation Listed | 688 |
| 5 | oatley | clara | F | 8 | Methodist | Blank | United States | No Occupation Listed | 688 |
| 8 | oatley | warren | M | 3 | Methodist | Blank | Quebec | No Occupation Listed | 689 |
| 23 | obrien | mary | F | 14 | Roman Catholic | Irish | Quebec | No Occupation Listed | 344 |
| 11 | ogden | agnes | F | 25 | Presbyterian | Scottish | Quebec | No Occupation Listed | 658 |
| 12 | ogden | daniel | M | 4 | Presbyterian | Scottish | Quebec | No Occupation Listed | 658 |
| 10 | ogden | james | M | 28 | Presbyterian | Scottish | United States | Mechanics | 658 |
| 13 | ogden | jessie | F | 2 | Presbyterian | Scottish | Quebec | No Occupation Listed | 658 |
| 12 | ogilvie | jenny | F | 40 | Presbyterian | Scottish | Scotland | No Occupation Listed | 471 |
| 13 | ogilvie | jenny | F | 19 | Presbyterian | Scottish | Quebec | Day labourers (e.g journalier) | 471 |
| 14 | ogilvie | john | M | 18 | Presbyterian | Scottish | Quebec | Mechanics | 471 |