Residents of St. Roch, North—Nord — Sub-district D, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 13 | obrien | anny | F | 35 | Roman Catholic | Irish | Ireland | No Occupation Listed | 207 |
| 15 | obrien | bessy | F | 8 | Roman Catholic | Irish | Quebec | No Occupation Listed | 207 |
| 16 | obrien | edouard | M | 5 | Roman Catholic | Irish | Quebec | No Occupation Listed | 207 |
| 12 | obrien | edward | M | 40 | Roman Catholic | Irish | Quebec | No Occupation Listed | 262 |
| 18 | obrien | ellen | F | 3 | Roman Catholic | Irish | Quebec | No Occupation Listed | 207 |
| 14 | obrien | irvine | M | 10 | Roman Catholic | Irish | Quebec | No Occupation Listed | 207 |
| 12 | obrien | john | M | 36 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 207 |
| 17 | obrien | patrick | M | 0 | Roman Catholic | Irish | Quebec | No Occupation Listed | 207 |
| 23 | oconnor | ann | F | 48 | Roman Catholic | Irish | Ireland | No Occupation Listed | 263 |
| 24 | odonnell | hugh | M | 28 | Roman Catholic | Irish | Quebec | Civil engineers | 125 |
| 25 | odonnell | john | M | 27 | Roman Catholic | Irish | Quebec | advocate | 125 |
| 20 | odonnell | john | M | 39 | Roman Catholic | Irish | Quebec | No Occupation Listed | 262 |
| 23 | odonnell | mary | F | 26 | Roman Catholic | Irish | Quebec | No Occupation Listed | 125 |
| 21 | odonnell | odelaide | F | 70 | Roman Catholic | Irish | Quebec | No Occupation Listed | 125 |
| 22 | odonnell | odelaide | F | 25 | Roman Catholic | Irish | Quebec | No Occupation Listed | 125 |
| 1 | oisel | alfred | M | 22 | Roman Catholic | French | Quebec | Boot and shoemakers and repairers | 55 |
| 2 | oisel | alfred | M | 3 | Roman Catholic | French | Quebec | No Occupation Listed | 55 |
| 25 | oisel | emma | F | 22 | Roman Catholic | French | Quebec | No Occupation Listed | 55 |
| 3 | oisel | marie | F | 0 | Roman Catholic | French | United States | No Occupation Listed | 55 |
| 24 | okeefe | margaret | F | 44 | Unknown | American | United States | No Occupation Listed | 263 |
| 11 | omeara | bridget | F | 38 | Roman Catholic | Irish | Quebec | No Occupation Listed | 263 |
| 22 | oneil | eliza | F | 60 | Protestant | Irish | Ireland | No Occupation Listed | 263 |
| 7 | oneil | john | M | 29 | Roman Catholic | Irish | Quebec | Farmers, general and nfs | 230 |
| 8 | oneil | joseph | M | 17 | Roman Catholic | Irish | Quebec | Farmers, general and nfs | 230 |
| 4 | orourke | ellen | F | 37 | Roman Catholic | Irish | Ireland | No Occupation Listed | 263 |
| 1 | ouellet | alphonse | M | 32 | Roman Catholic | French | Quebec | Servants nfs | 261 |
| 16 | ouellet | angele | F | 34 | Roman Catholic | French | Quebec | No Occupation Listed | 104 |
| 18 | ouellet | anna | F | 28 | Roman Catholic | French | Quebec | Servants nfs | 259 |
| 17 | ouellet | marie | F | 0 | Roman Catholic | French | Quebec | No Occupation Listed | 104 |
| 15 | ouellet | theophile | M | 44 | Roman Catholic | French | Quebec | Other production and related workers nec | 104 |
| 22 | ouellette | albert | M | 0 | Roman Catholic | French | Quebec | No Occupation Listed | 253 |
| 21 | ouellette | audiana | F | 3 | Roman Catholic | French | Quebec | No Occupation Listed | 253 |
| 19 | ouellette | elie | M | 34 | Roman Catholic | French | Quebec | Drivers, nec | 253 |
| 20 | ouellette | georgina | F | 26 | Roman Catholic | French | Quebec | No Occupation Listed | 253 |
| 20 | owen | eliza | F | 41 | Anglican | English | Quebec | No Occupation Listed | 81 |