Residents of Somerville — Sub-district G, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 18 | obrien | alberta | F | 19 | Wesleyan Methodist | German | Ontario | Servants nfs | 115 |
| 15 | obrien | alice | F | 22 | Wesleyan Methodist | Irish | United States | No Occupation Listed | 115 |
| 14 | obrien | amelia | F | 3 | Presbyterian | Irish | Ontario | No Occupation Listed | 111 |
| 13 | obrien | ann | F | 61 | Adventist Family | English | England | No Occupation Listed | 115 |
| 9 | obrien | edgar | M | 12 | Presbyterian | Irish | Ontario | No Occupation Listed | 111 |
| 17 | obrien | edith | F | 0 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 115 |
| 10 | obrien | eugenie | F | 11 | Presbyterian | Irish | Ontario | No Occupation Listed | 111 |
| 13 | obrien | george | M | 4 | Presbyterian | Irish | Ontario | No Occupation Listed | 111 |
| 8 | obrien | isabella | F | 40 | Presbyterian | Scottish | Ontario | No Occupation Listed | 111 |
| 14 | obrien | jessey | M | 29 | Adventist Family | Irish | Ontario | Farmers, general and nfs | 115 |
| 11 | obrien | langford | M | 9 | Presbyterian | Irish | Ontario | No Occupation Listed | 111 |
| 12 | obrien | roderick | M | 61 | Adventist Family | Irish | Ontario | Farmers, general and nfs | 115 |
| 16 | obrien | roderick | M | 2 | Wesleyan Methodist | Irish | Ontario | No Occupation Listed | 115 |
| 7 | obrien | silas | M | 38 | United Methodist/Bible Christian | Irish | Ontario | Labourers nfs | 111 |
| 12 | obrien | wilbert | M | 7 | Presbyterian | Irish | Ontario | No Occupation Listed | 111 |
| 13 | oswald | mary | F | 64 | Presbyterian | Scottish | Scotland | No Occupation Listed | 194 |
| 15 | oswald | mary | F | 20 | Presbyterian | Scottish | Scotland | No Occupation Listed | 194 |
| 14 | oswald | robert | M | 28 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 194 |
| 12 | oswald | thomas | M | 59 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 194 |