Residents of Perth, T-V — Sub-district B, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 5 | oatway | ellen | F | 76 | Presbyterian | Scottish | Scotland | No Occupation Listed | 160 |
| 6 | oatway | jessie | F | 24 | Presbyterian | English | Ontario | No Occupation Listed | 160 |
| 4 | oatway | john | M | 66 | Presbyterian | English | England | Plasterers | 160 |
| 3 | obrien | catherine | F | 58 | Roman Catholic | Irish | Ireland | No Occupation Listed | 164 |
| 21 | obrien | fanny | F | 58 | Anglican | Irish | Ireland | No Occupation Listed | 17 |
| 22 | obrien | james | M | 40 | Anglican | Irish | Ireland | Labourers nfs | 17 |
| 20 | obrien | john | M | 72 | Anglican | Irish | Ireland | Labourers nfs | 17 |
| 5 | obrien | josephine | F | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 164 |
| 10 | obrien | margret | F | 19 | Roman Catholic | Irish | Ontario | Servants nfs | 143 |
| 7 | obrien | mary | F | 22 | Roman Catholic | Irish | Ontario | Servants nfs | 111 |
| 4 | obrien | therasa | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 164 |
| 2 | obrien | william | M | 62 | Roman Catholic | Irish | Ireland | Superintendents and managers, manufacturing | 164 |
| 23 | obrien | william | M | 28 | Anglican | Irish | Ontario | Labourers nfs | 17 |
| 15 | obrine | mary | F | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 71 |
| 18 | oconnor | john | M | 53 | Roman Catholic | Irish | Ontario | Ministers of Religion | 127 |
| 20 | oconnor | margret | F | 45 | Roman Catholic | Irish | Ontario | No Occupation Listed | 127 |
| 11 | oday | catherine | F | 14 | Roman Catholic | Irish | United States | No Occupation Listed | 13 |
| 8 | oday | denis | M | 46 | Roman Catholic | Irish | Ireland | Labourers nfs | 13 |
| 12 | oday | john | M | 12 | Roman Catholic | Irish | United States | No Occupation Listed | 13 |
| 13 | oday | margret | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 13 |
| 9 | oday | mariah | F | 41 | Roman Catholic | Irish | Ontario | No Occupation Listed | 13 |
| 10 | oday | mathew | M | 18 | Roman Catholic | Irish | Ontario | Labourers nfs | 13 |
| 12 | olaughlan | ellen | F | 50 | Roman Catholic | Irish | Ireland | No Occupation Listed | 39 |
| 14 | olaughlan | john | M | 19 | Roman Catholic | Irish | Ontario | Labourers nfs | 39 |
| 15 | olaughlan | marey | F | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 13 | olaughlan | margret | F | 21 | Roman Catholic | Irish | Ontario | Seamstress | 39 |
| 11 | olaughlan | martin | M | 50 | Roman Catholic | Irish | Ireland | Watchmen and guards | 39 |
| 21 | oliver | george | M | 17 | Presbyterian | Scottish | Ontario | Labourers nfs | 88 |
| 12 | oliver | marey | F | 56 | Anglican | Irish | Ontario | No Occupation Listed | 187 |
| 13 | oliver | marey | F | 23 | Presbyterian | Irish | Ontario | No Occupation Listed | 187 |
| 20 | oliver | thomas | M | 56 | Presbyterian | Scottish | Ontario | Carpenters | 88 |
| 22 | oliver | thomas | M | 15 | Presbyterian | Scottish | Ontario | No Occupation Listed | 88 |
| 1 | osburn | clara | F | 5 | Anglican | English | Ontario | No Occupation Listed | 153 |
| 25 | osburn | herriot | F | 7 | Anglican | English | Ontario | No Occupation Listed | 153 |
| 2 | osburn | jessie | F | 3 | Anglican | English | Ontario | No Occupation Listed | 153 |
| 24 | osburn | sarah | F | 35 | Anglican | English | Ontario | No Occupation Listed | 153 |