Residents of Notre-Dame-de-Grâce, Village — Sub-district K, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 20 | obrien | agnes | F | 10 | Roman Catholic | Irish | Quebec | No Occupation Listed | 177 |
| 22 | obrien | c | M | 5 | Roman Catholic | Irish | Quebec | No Occupation Listed | 177 |
| 18 | obrien | cornil | M | 37 | Roman Catholic | Irish | Quebec | Painters, nfs | 177 |
| 21 | obrien | florence | F | 8 | Roman Catholic | Irish | Quebec | No Occupation Listed | 177 |
| 19 | obrien | mary | F | 35 | Roman Catholic | Irish | Quebec | No Occupation Listed | 177 |
| 10 | oconnor | elysabeth | F | 27 | Roman Catholic | Irish | Quebec | No Occupation Listed | 51 |
| 19 | oconnor | john | M | 6 | Roman Catholic | Irish | Quebec | No Occupation Listed | 28 |
| 18 | oconnor | katy | F | 7 | Roman Catholic | Irish | Quebec | No Occupation Listed | 28 |
| 14 | oconnor | margaret | F | 34 | Roman Catholic | Irish | Ireland | No Occupation Listed | 28 |
| 16 | oconnor | margaret | F | 10 | Roman Catholic | Irish | Quebec | No Occupation Listed | 28 |
| 17 | oconnor | martin | M | 8 | Roman Catholic | Irish | Quebec | No Occupation Listed | 28 |
| 15 | oconnor | mary | F | 12 | Roman Catholic | Irish | Quebec | No Occupation Listed | 28 |
| 11 | oconnor | mary | F | 6 | Roman Catholic | Irish | Quebec | No Occupation Listed | 51 |
| 9 | oconnor | mathew | M | 32 | Roman Catholic | Irish | Quebec | Labourers nfs | 51 |
| 13 | oconnor | michael | M | 36 | Roman Catholic | Irish | Ireland | Machinists | 28 |
| 13 | oconnor | michael | M | 0 | Roman Catholic | Irish | Quebec | No Occupation Listed | 51 |
| 12 | oconnor | patrick | M | 4 | Roman Catholic | Irish | Quebec | No Occupation Listed | 51 |
| 14 | oconnor | thomas | M | 36 | Roman Catholic | Irish | Ireland | No Occupation Listed | 51 |
| 18 | ouellette | elise | F | 18 | Roman Catholic | French | Canada | Servants nfs | 250 |
| 24 | ouellette | georgina | F | 21 | Roman Catholic | French | Canada | Servants nfs | 250 |
| 7 | overng | charles | M | 15 | Baptist | Scottish | Quebec | No Occupation Listed | 180 |
| 3 | overng | charlotte | F | 47 | Baptist | Scottish | United States | No Occupation Listed | 180 |
| 4 | overng | david | M | 27 | Baptist | Scottish | United States | Occupational title unclassifiable | 180 |
| 11 | overng | jane | F | 7 | Baptist | Scottish | Quebec | No Occupation Listed | 180 |
| 8 | overng | john | M | 13 | Baptist | Scottish | Quebec | No Occupation Listed | 180 |
| 6 | overng | l | F | 19 | Baptist | Scottish | Quebec | No Occupation Listed | 180 |
| 9 | overng | mary | F | 10 | Baptist | Scottish | Quebec | No Occupation Listed | 180 |
| 10 | overng | robert | M | 9 | Baptist | Scottish | Quebec | No Occupation Listed | 180 |
| 2 | overng | thomas | M | 43 | Episcopal | English | Quebec | Wire makers | 180 |
| 5 | overng | thomas | M | 25 | Baptist | Scottish | United States | Occupational title unclassifiable | 180 |
| 23 | oxely | william | M | 21 | Methodist | English | England | Farmers, general and nfs | 216 |