Residents of Fredericton, Carleton, Ward—Quartier — Sub-district C, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 4 | obrien | archibald | M | 15 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 250 |
| 1 | obrien | dennis | M | 43 | Roman Catholic | Irish | Ireland | Servants nfs | 250 |
| 5 | obrien | john | M | 12 | Roman Catholic | Irish | New Brunswick | Clerks in shops and stores | 250 |
| 2 | obrien | mary | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 250 |
| 6 | obrien | mary | F | 6 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 250 |
| 3 | obrien | william | M | 18 | Roman Catholic | Irish | New Brunswick | Telegraph operators | 250 |
| 6 | oirr | john | M | 22 | Methodist | Scottish | New Brunswick | Hirers out | 145 |
| 10 | oleary | annie | F | 18 | Roman Catholic | Irish | New Brunswick | Dressmakers | 111 |
| 20 | oleary | catherine | F | 14 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 259 |
| 15 | oleary | dennis | M | 60 | Roman Catholic | Irish | Ireland | Labourers nfs | 259 |
| 21 | oleary | ellen | F | 21 | Roman Catholic | Irish | Ireland | No Occupation Listed | 259 |
| 6 | oleary | james | M | 53 | Roman Catholic | Irish | Ireland | Boot and shoemakers and repairers | 111 |
| 8 | oleary | jeremiah | M | 26 | Roman Catholic | Irish | New Brunswick | Boot and shoemakers and repairers | 111 |
| 9 | oleary | john | M | 23 | Roman Catholic | Irish | New Brunswick | Boot and shoemakers and repairers | 111 |
| 17 | oleary | john | M | 19 | Roman Catholic | Irish | Ireland | Printers nfs | 259 |
| 7 | oleary | margaret | F | 28 | Roman Catholic | Irish | New Brunswick | Tailors and tailoresses | 111 |
| 23 | oleary | mary | F | 37 | Roman Catholic | Irish | Ireland | No Occupation Listed | 46 |
| 24 | oleary | mary | F | 5 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 46 |
| 16 | oleary | mary | F | 50 | Roman Catholic | Irish | Ireland | No Occupation Listed | 259 |
| 22 | oleary | michael | M | 40 | Roman Catholic | Irish | Ireland | Labourers nfs | 46 |
| 18 | oleary | michael | M | 16 | Roman Catholic | Irish | New Brunswick | Butchers | 259 |
| 19 | oleary | timothy | M | 7 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 259 |
| 14 | oneil | elizabeth | F | 60 | Roman Catholic | Irish | Ireland | No Occupation Listed | 149 |
| 3 | oneill | brideget | F | 78 | Roman Catholic | Irish | Ireland | No Occupation Listed | 233 |
| 11 | oniel | catherine | F | 60 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 163 |
| 7 | orr | arthur | M | 17 | Methodist | Scottish | New Brunswick | Dealer, merchant etc. (Wholesale & retail trade) | 145 |
| 6 | orr | charles | M | 20 | Methodist | Scottish | New Brunswick | No Occupation Listed | 2 |
| 8 | orr | hattie | F | 1 | Methodist | Scottish | New Brunswick | No Occupation Listed | 2 |
| 5 | orr | jerusha | F | 54 | Methodist | Irish | New Brunswick | No Occupation Listed | 145 |
| 7 | orr | minnie | F | 20 | Methodist | English | New Brunswick | No Occupation Listed | 2 |
| 9 | orr | robert | M | 0 | Methodist | Scottish | New Brunswick | No Occupation Listed | 2 |
| 4 | orr | robert | M | 60 | Presbyterian | Scottish | New Brunswick | Hotel Keepers and Managers | 145 |
| 1 | owens | francis | M | 47 | Roman Catholic | Irish | Ireland | No Occupation Listed | 109 |
| 2 | owens | marey | F | 48 | Roman Catholic | Irish | Ireland | No Occupation Listed | 109 |
| 8 | owens | rosa | F | 20 | Roman Catholic | Irish | New Brunswick | Servants nfs | 146 |