Residents of Blackville — Sub-district G, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 9 | obrien | agnes | F | 6 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 70 |
| 23 | obrien | charles | M | 9 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 9 |
| 7 | obrien | elizabeth | F | 40 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 70 |
| 21 | obrien | john | M | 40 | Roman Catholic | Irish | New Brunswick | Farmers, general and nfs | 9 |
| 8 | obrien | john | M | 9 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 70 |
| 24 | obrien | margaret | F | 5 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 9 |
| 22 | obrien | mary | F | 35 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 9 |
| 1 | obrien | mary | F | 1 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 9 |
| 10 | obrien | mary | F | 4 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 70 |
| 6 | obrien | michael | M | 42 | Roman Catholic | Irish | Prince Edward Island | Farmers, general and nfs | 70 |
| 11 | obrien | michael | M | 1 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 70 |
| 25 | obrien | patrick | M | 3 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 9 |
| 23 | okeefe | james | M | 1 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 176 |
| 18 | okeefe | john | M | 30 | Roman Catholic | Irish | New Brunswick | Farmers, general and nfs | 176 |
| 21 | okeefe | kate | F | 24 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 176 |
| 19 | okeefe | maggie | F | 28 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 176 |
| 22 | okeefe | maggie | F | 7 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 176 |
| 20 | okeefe | mary | F | 26 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 176 |
| 12 | on | james | M | 52 | Roman Catholic | Irish | New Brunswick | Farmers, general and nfs | 34 |
| 13 | on | thomas | M | 20 | Roman Catholic | Irish | New Brunswick | Farmers, general and nfs | 34 |
| 6 | oniel | mary | F | 50 | Roman Catholic | Irish | New Brunswick | Servants nfs | 94 |