Residents of Portsmouth, Village — Sub-district B, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 22 | obrien | eliza | F | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 83 |
| 9 | obrien | mary | F | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 111 |
| 11 | obrien | patrick | M | 46 | Roman Catholic | Irish | England | Stone carvers or cutters and stone yard workers | 5 |
| 3 | obrien | thomas | M | 36 | Roman Catholic | Irish | Ireland | No Occupation Listed | 5 |
| 16 | oconner | richard | M | 19 | Roman Catholic | Irish | United States | Cigar makers | 5 |
| 14 | oconnor | hannah | F | 86 | Roman Catholic | Blank | Ireland | No Occupation Listed | 179 |
| 5 | odriscoll | agnes | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 70 |
| 25 | odriscoll | annie | F | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 70 |
| 4 | odriscoll | augustus | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 70 |
| 1 | odriscoll | catherine | F | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 70 |
| 21 | odriscoll | jerh | M | 47 | Roman Catholic | Irish | Ireland | Watchmen and guards | 70 |
| 2 | odriscoll | john | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 70 |
| 3 | odriscoll | joseph | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 70 |
| 22 | odriscoll | margaret | F | 39 | Roman Catholic | Irish | Ontario | No Occupation Listed | 70 |
| 24 | odriscoll | margaret | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 70 |
| 23 | odriscoll | mary | F | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 70 |
| 10 | ogrady | patrick | M | 27 | Roman Catholic | Irish | Ireland | Weavers | 5 |
| 15 | ohare | john | M | 33 | Roman Catholic | Blank | Ontario | No Occupation Listed | 179 |
| 11 | oiulleth | michael | M | 35 | Roman Catholic | Scottish | Ontario | Farmers, general and nfs | 5 |
| 16 | okeefe | margaret | M | 32 | Roman Catholic | Irish | Ireland | No Occupation Listed | 5 |
| 7 | oliver | john | M | 44 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 5 |
| 16 | oneil | john | M | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 41 |
| 15 | oneil | mary | F | 49 | Roman Catholic | Irish | Ireland | No Occupation Listed | 41 |
| 17 | oneil | mary | F | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 41 |
| 14 | oneil | richard | M | 50 | Roman Catholic | Irish | Ireland | Matrons | 41 |
| 18 | oneil | richard | M | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 41 |
| 7 | orr | william | M | 28 | | English | Ontario | Farmers, general and nfs | 5 |
| 13 | ouilette | pierse | M | 34 | Roman Catholic | French | Quebec | No Occupation Listed | 5 |
| 6 | ouimette | alfred | M | 21 | Roman Catholic | French | United States | Boot and shoemakers and repairers | 5 |