Residents of Mornington — Sub-district F, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 1 | oeish | annie | F | 0 | | German | Ontario | No Occupation Listed | 191 |
| 24 | oeish | barbara | F | 2 | | German | Ontario | No Occupation Listed | 191 |
| 23 | oeish | christian | M | 3 | | German | Ontario | No Occupation Listed | 191 |
| 21 | oeish | john | M | 30 | | German | Germany | Farmers, general and nfs | 191 |
| 22 | oeish | magdalene | F | 40 | | German | Ontario | No Occupation Listed | 191 |
| 25 | oeish | mary | F | 1 | | German | Ontario | No Occupation Listed | 191 |
| 14 | ogrady | bridget | F | 12 | | Irish | Ontario | No Occupation Listed | 182 |
| 11 | ogrady | cathern | F | 40 | | Irish | Ireland | No Occupation Listed | 182 |
| 10 | ogrady | james | M | 40 | | Irish | Ireland | Farmers, general and nfs | 182 |
| 16 | ogrady | james | M | 9 | | Irish | Ontario | No Occupation Listed | 182 |
| 12 | ogrady | john | M | 16 | | Irish | Ontario | No Occupation Listed | 182 |
| 13 | ogrady | mary | F | 14 | | Irish | Ontario | No Occupation Listed | 182 |
| 17 | ogrady | rosanna | F | 4 | | Irish | Ontario | No Occupation Listed | 182 |
| 15 | ogrady | thomas | M | 10 | | Irish | Ontario | No Occupation Listed | 182 |
| 18 | ogrady | william | M | 3 | | Irish | Ontario | No Occupation Listed | 182 |
| 17 | olipher | beatrice | F | 54 | | Scottish | Scotland | No Occupation Listed | 82 |
| 16 | olipher | peter | M | 52 | | Scottish | Scotland | Farmers, general and nfs | 82 |
| 1 | opper | cathern | F | 51 | Lutheran | German | Germany | No Occupation Listed | 11 |
| 2 | opper | charles | M | 17 | Lutheran | German | Ontario | Farmers, general and nfs | 11 |
| 21 | opper | conrad | M | 25 | Lutheran | German | Ontario | Blacksmiths | 95 |
| 9 | opper | louis | M | 0 | Lutheran | German | Ontario | No Occupation Listed | 12 |
| 7 | opper | michal | M | 29 | Lutheran | German | Ontario | Farmers, general and nfs | 12 |
| 3 | opper | peter | M | 14 | Lutheran | German | Ontario | No Occupation Listed | 11 |
| 25 | opper | philip | M | 54 | Lutheran | German | Germany | Farmers, general and nfs | 11 |
| 8 | opper | rosana | F | 20 | Lutheran | German | Germany | No Occupation Listed | 12 |
| 4 | opper | william | M | 11 | Lutheran | German | Ontario | No Occupation Listed | 11 |
| 18 | orr | harriet | F | 28 | Methodist | Blank | Ontario | No Occupation Listed | 59 |
| 11 | orr | janet | F | 75 | Presbyterian | Scottish | Scotland | No Occupation Listed | 88 |
| 17 | orr | william | M | 31 | Presbyterian | Scottish | United States | Farmers, general and nfs | 59 |
| 10 | orr | william | M | 76 | Presbyterian | Scottish | Scotland | Military, specialisation unknown | 88 |
| 15 | ottmann | jacob | M | 17 | Lutheran | German | Ontario | Cartwrights and wheelwrights | 22 |