Residents of St. Hyacinthe, City—Cité — Sub-district A, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 23 | oliver | henriette | F | 71 | Roman Catholic | French | France | No Occupation Listed | 295 |
| 23 | olivier | adee | F | 62 | Roman Catholic | French | Quebec | No Occupation Listed | 62 |
| 23 | olivier | anna | F | 11 | Roman Catholic | French | Quebec | No Occupation Listed | 295 |
| 22 | olivier | elzear | M | 66 | Roman Catholic | French | Quebec | Boot and shoemakers and repairers | 62 |
| 24 | olivier | henri | M | 27 | Roman Catholic | French | Quebec | Dealer, merchant etc. (Wholesale & retail trade) | 63 |
| 25 | olivier | josephine | F | 24 | Roman Catholic | French | Quebec | No Occupation Listed | 63 |
| 2 | ostilly | emelie | F | 76 | Roman Catholic | French | Quebec | No Occupation Listed | 201 |
| 24 | othies | felinte | F | 70 | Roman Catholic | French | Quebec | No Occupation Listed | 295 |
| 16 | ouellet | reme | M | 57 | Roman Catholic | French | Canada | Ministers of Religion | 615 |
| 11 | ouellette | adele | F | 11 | Roman Catholic | French | United States | No Occupation Listed | 576 |
| 9 | ouellette | alice | F | 14 | Roman Catholic | French | United States | No Occupation Listed | 576 |
| 6 | ouellette | angele | F | 45 | Roman Catholic | French | Canada | No Occupation Listed | 576 |
| 13 | ouellette | cathe | F | 30 | Roman Catholic | Irish | United States | No Occupation Listed | 577 |
| 12 | ouellette | cleophas | M | 53 | Roman Catholic | French | United States | Barbers | 577 |
| 14 | ouellette | edward | M | 23 | Roman Catholic | French | United States | Barbers | 577 |
| 2 | ouellette | elrina | F | 36 | Roman Catholic | French Canadian | Canada | No Occupation Listed | 193 |
| 5 | ouellette | emile | M | 4 | Roman Catholic | French Canadian | Canada | No Occupation Listed | 193 |
| 10 | ouellette | emma | F | 12 | Roman Catholic | French | United States | No Occupation Listed | 576 |
| 5 | ouellette | firmin | M | 60 | Roman Catholic | French | Canada | No Occupation Listed | 576 |
| 8 | ouellette | george | M | 15 | Roman Catholic | French | United States | No Occupation Listed | 576 |
| 4 | ouellette | horace | M | 6 | Roman Catholic | French Canadian | Canada | No Occupation Listed | 193 |
| 1 | ouellette | joseph | M | 37 | Roman Catholic | French Canadian | Canada | Boot and shoemakers and repairers | 193 |
| 3 | ouellette | joseph | M | 9 | Roman Catholic | French Canadian | Canada | No Occupation Listed | 193 |
| 7 | ouellette | joseph | M | 17 | Roman Catholic | French | United States | No Occupation Listed | 576 |
| 15 | ouellette | octave | M | 27 | Roman Catholic | French | United States | Barbers | 577 |
| 8 | ouellette | soeur | F | 42 | Roman Catholic | French | Quebec | Members of religious orders | 295 |
| 19 | oullette | leocadi | F | 41 | Roman Catholic | French Canadian | Canada | Members of religious orders | 220 |