Residents of Dumfries S — Sub-district C, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 8 | obrian | corneilus | M | 17 | Roman Catholic | Irish | United States | No Occupation Listed | 22 |
| 3 | obrian | dennis | M | 48 | Roman Catholic | Irish | Ireland | Labourers nfs | 22 |
| 6 | obrian | dennis | M | 22 | Roman Catholic | Irish | United States | No Occupation Listed | 22 |
| 7 | obrian | elizabeth | F | 19 | Roman Catholic | Irish | United States | No Occupation Listed | 22 |
| 9 | obrian | ellen | F | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 22 |
| 10 | obrian | henry | M | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 22 |
| 5 | obrian | jeremiah | M | 25 | Roman Catholic | Irish | United States | No Occupation Listed | 22 |
| 4 | obrian | margret | F | 49 | Roman Catholic | Irish | — | No Occupation Listed | 22 |
| 1 | obrien | mary | F | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 9 | oconnell | john | M | 17 | Anglican | Irish | Ontario | Labourers nfs | 68 |
| 5 | oconnor | john | M | 62 | Roman Catholic | Irish | Ireland | No Occupation Listed | 132 |
| 6 | oconnor | mary | F | 53 | Roman Catholic | Irish | Ireland | No Occupation Listed | 132 |
| 7 | oconnor | mary | F | 24 | Roman Catholic | Irish | Quebec | No Occupation Listed | 132 |
| 13 | oertridge | alberta | F | 6 | Methodist | English | Ontario | No Occupation Listed | 78 |
| 11 | oertridge | alice | F | 25 | Methodist | English | Ontario | No Occupation Listed | 78 |
| 14 | oertridge | annie | F | 3 | Methodist | English | Ontario | No Occupation Listed | 78 |
| 10 | oertridge | charles | M | 30 | Methodist | English | Ontario | Boot and shoemakers and repairers | 78 |
| 15 | oertridge | charles | M | 1 | Methodist | English | Ontario | No Occupation Listed | 78 |
| 12 | oertridge | william | M | 8 | Methodist | English | Ontario | No Occupation Listed | 78 |
| 8 | okeefe | lucy | F | 28 | Roman Catholic | Irish | Ontario | No Occupation Listed | 213 |
| 7 | okeefe | martan | M | 30 | Roman Catholic | Irish | Ireland | Railway switchmen and shunters | 213 |
| 9 | okeefe | mary | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 213 |
| 5 | oliver | albert | M | 3 | Wesleyan Methodist | English | Ontario | No Occupation Listed | 80 |
| 24 | oliver | ann | F | 59 | Wesleyan Methodist | English | Ontario | No Occupation Listed | 80 |
| 4 | oliver | george | M | 20 | Wesleyan Methodist | English | England | Farmers, general and nfs | 80 |
| 2 | oliver | john | M | 28 | Wesleyan Methodist | English | England | Farmers, general and nfs | 80 |
| 3 | oliver | maria | F | 24 | Wesleyan Methodist | English | England | No Occupation Listed | 80 |
| 23 | oliver | stephen | M | 57 | Wesleyan Methodist | English | England | Farmers, general and nfs | 80 |
| 1 | oliver | william | M | 30 | Wesleyan Methodist | English | England | Farmers, general and nfs | 80 |
| 17 | oneail | charles | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 120 |
| 18 | oneail | danieal | M | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 120 |
| 19 | oneail | eleanor | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 120 |
| 16 | oneail | james | M | 39 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 120 |
| 22 | oneal | daneail | M | 83 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 121 |
| 23 | oneal | eleanor | F | 69 | Roman Catholic | Scottish | Scotland | No Occupation Listed | 121 |
| 24 | oneal | elizabeth | F | 48 | Roman Catholic | Irish | Ireland | No Occupation Listed | 121 |
| 11 | oneil | charles | M | 46 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 128 |
| 17 | oneil | charles | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 128 |
| 14 | oneil | daniel | M | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 128 |
| 13 | oneil | eleanor | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 128 |
| 12 | oneil | margret | F | 42 | Roman Catholic | Scottish | Ontario | No Occupation Listed | 128 |
| 15 | oneil | mary | F | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 128 |
| 18 | oneil | rose | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 128 |
| 16 | oneil | william | M | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 128 |
| 7 | oneill | annie | F | 18 | Methodist | Irish | Ontario | No Occupation Listed | 33 |
| 4 | oneill | charles | M | 48 | Methodist | Irish | Ontario | Farmers, general and nfs | 33 |
| 9 | oneill | charles | M | 14 | Methodist | Irish | Ontario | No Occupation Listed | 33 |
| 10 | oneill | martin | M | 8 | Methodist | Irish | Ontario | No Occupation Listed | 33 |
| 5 | oneill | mary | F | 46 | Methodist | Irish | Ontario | No Occupation Listed | 33 |
| 8 | oneill | roseanna | F | 17 | Methodist | Irish | Ontario | No Occupation Listed | 33 |
| 6 | oneill | william | M | 22 | Methodist | Irish | Ontario | No Occupation Listed | 33 |
| 12 | oneill | william | M | 42 | Roman Catholic | Irish | Ontario | No Occupation Listed | 33 |
| 18 | osborne | daniel | M | 55 | Baptist | English | England | Farmers, general and nfs | 185 |
| 21 | osborne | daniel | M | 27 | Baptist | English | Ontario | No Occupation Listed | 185 |
| 3 | osborne | edward | M | 7 | Baptist | English | Ontario | No Occupation Listed | 186 |
| 22 | osborne | elizabeth | F | 23 | Baptist | English | Ontario | No Occupation Listed | 185 |
| 5 | osborne | ella | F | 3 | Baptist | English | Ontario | No Occupation Listed | 186 |
| 23 | osborne | fannie | F | 21 | Baptist | English | Ontario | No Occupation Listed | 185 |
| 19 | osborne | maria | F | 54 | Baptist | English | England | No Occupation Listed | 185 |
| 2 | osborne | mary | F | 26 | Baptist | English | Ontario | No Occupation Listed | 186 |
| 20 | osborne | thomas | M | 29 | Baptist | English | Ontario | Farmers, general and nfs | 185 |
| 1 | osborne | walter | M | 32 | Baptist | English | England | Farmers, general and nfs | 186 |
| 4 | osborne | william | M | 5 | Baptist | English | Ontario | No Occupation Listed | 186 |