Residents of Dumfries N — Sub-district B, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 20 | odonnel | edith | F | 0 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 185 |
| 18 | odonnel | john | M | 28 | Wesleyan Methodist | Irish | Ireland | Labourers nfs | 185 |
| 19 | odonnel | sarah | F | 25 | Wesleyan Methodist | English | Ontario | No Occupation Listed | 185 |
| 24 | oliver | adam | M | 50 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 400 |
| 25 | oliver | agness | F | 47 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 400 |
| 23 | oliver | alexander | M | 1 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 4 | oliver | andrew | M | 65 | Presbyterian | Scottish | England | Farmers, general and nfs | 188 |
| 4 | oliver | andrew | M | 13 | Presbyterian | Scottish | Ontario | No Occupation Listed | 400 |
| 12 | oliver | catherine | F | 12 | Presbyterian | Scottish | Ontario | No Occupation Listed | 232 |
| 17 | oliver | edward | M | 15 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 10 | oliver | elisabeth | F | 45 | Presbyterian | Scottish | Ontario | No Occupation Listed | 232 |
| 5 | oliver | elspeth | F | 25 | Presbyterian | Scottish | Ontario | No Occupation Listed | 188 |
| 7 | oliver | fannie | F | 19 | Presbyterian | Scottish | Ontario | No Occupation Listed | 188 |
| 1 | oliver | george | M | 42 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 102 |
| 13 | oliver | george | M | 51 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 43 |
| 20 | oliver | george | M | 10 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 2 | oliver | isabella | F | 36 | Presbyterian | Scottish | Ontario | No Occupation Listed | 102 |
| 3 | oliver | james | M | 30 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 102 |
| 5 | oliver | james | M | 11 | Presbyterian | Scottish | Ontario | No Occupation Listed | 102 |
| 14 | oliver | jennet | F | 39 | Presbyterian | Scottish | Scotland | No Occupation Listed | 43 |
| 18 | oliver | jessie | F | 14 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 25 | oliver | john | M | 58 | Presbyterian | Scottish | Scotland | No Occupation Listed | 51 |
| 24 | oliver | john | M | 49 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 102 |
| 8 | oliver | john | M | 12 | Presbyterian | Scottish | Ontario | No Occupation Listed | 188 |
| 4 | oliver | mary | F | 23 | Presbyterian | Scottish | Ontario | No Occupation Listed | 102 |
| 9 | oliver | mary | F | 9 | Presbyterian | Scottish | Ontario | No Occupation Listed | 188 |
| 16 | oliver | mary | F | 17 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 24 | oliver | mary | F | 78 | Presbyterian | Scottish | Scotland | No Occupation Listed | 154 |
| 11 | oliver | mary | F | 14 | Presbyterian | Scottish | Ontario | No Occupation Listed | 232 |
| 2 | oliver | mary | F | 88 | Presbyterian | Scottish | Scotland | No Occupation Listed | 235 |
| 15 | oliver | robena | F | 19 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 6 | oliver | robert | M | 21 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 188 |
| 22 | oliver | robert | M | 4 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 22 | oliver | robert | M | 38 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 154 |
| 1 | oliver | robert | M | 24 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 400 |
| 19 | oliver | thomas | M | 12 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 9 | oliver | thomas | M | 55 | Presbyterian | Scottish | United States | river drivers | 232 |
| 3 | oliver | walter | M | 16 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 400 |
| 5 | oliver | walter | M | 65 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 400 |
| 25 | oliver | william | M | 46 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 102 |
| 21 | oliver | william | M | 7 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 2 | oliver | william | M | 18 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 400 |
| 11 | omstead | george | M | 25 | Presbyterian | English | Ontario | river drivers | 32 |
| 2 | orr | agnes | F | 26 | Presbyterian | Scottish | Ontario | No Occupation Listed | 170 |
| 14 | orr | andrew | M | 60 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 93 |
| 16 | orr | andrew | M | 20 | Presbyterian | Scottish | Ontario | No Occupation Listed | 93 |
| 3 | orr | annie | F | 1 | Presbyterian | Scottish | Ontario | No Occupation Listed | 170 |
| 4 | orr | anthony | M | 32 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 170 |
| 1 | orr | john | M | 28 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 170 |
| 17 | orr | maggie | F | 15 | Presbyterian | Scottish | Ontario | No Occupation Listed | 93 |
| 15 | orr | robert | M | 25 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 93 |
| 3 | ortwein | christina | F | 26 | Evangelical | German | Ontario | No Occupation Listed | 146 |
| 2 | ortwein | henry | M | 25 | Evangelical | German | Ontario | Coach, carriage, cart and wagon makers | 146 |
| 4 | ortwein | joanna | F | 1 | Evangelical | German | Ontario | No Occupation Listed | 146 |