Residents of St. John, Brook’s, Ward—Quartier — Sub-district G, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 25 | obrien | andrew | M | 15 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 79 |
| 22 | obrien | ann | F | 45 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 79 |
| 21 | obrien | joseph | M | 56 | Roman Catholic | Irish | New Brunswick | Superintendents and managers, public utilities | 79 |
| 4 | obrien | joseph | M | 3 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 79 |
| 3 | obrien | josephine | F | 5 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 79 |
| 1 | obrien | margaret | F | 13 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 79 |
| 24 | obrien | mary | F | 16 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 79 |
| 2 | obrien | micheal | M | 12 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 37 |
| 2 | obrien | nellie | F | 5 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 79 |
| 23 | obrien | thomas | M | 19 | Roman Catholic | Irish | New Brunswick | Seamen | 79 |
| 4 | obrien | | F | 32 | Roman Catholic | Irish | New Brunswick | Teachers (unspecified) | 43 |
| 17 | oconnor | mary | F | 28 | Roman Catholic | Irish | Ireland | Dressmakers | 262 |
| 12 | ohea | lousa | F | 45 | Roman Catholic | Irish | Ireland | No Occupation Listed | 114 |
| 13 | olive | amyet | F | 37 | Anglican | English | New Brunswick | No Occupation Listed | 72 |
| 16 | olive | beatrice | F | 9 | Anglican | English | New Brunswick | No Occupation Listed | 72 |
| 17 | olive | bernice | F | 9 | Anglican | English | New Brunswick | No Occupation Listed | 72 |
| 12 | olive | charles | M | 38 | Anglican | English | New Brunswick | Carpenters | 72 |
| 18 | olive | charles | M | 6 | Anglican | English | New Brunswick | No Occupation Listed | 72 |
| 15 | olive | elizabeth | F | 11 | Anglican | English | New Brunswick | No Occupation Listed | 72 |
| 14 | olive | mary | F | 14 | Anglican | English | New Brunswick | No Occupation Listed | 72 |