Residents of St. Vincent — Sub-district I, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 8 | oakman | jane | F | 63 | Presbyterian | Irish | Ireland | No Occupation Listed | 122 |
| 5 | oliver | anna | F | 52 | Disciple of Christ | English | England | No Occupation Listed | 85 |
| 6 | oliver | george | M | 17 | Disciple of Christ | English | Ontario | No Occupation Listed | 85 |
| 4 | oliver | james | M | 55 | Disciple of Christ | English | England | Dealer, merchant etc. (Wholesale & retail trade) | 85 |
| 7 | oliver | lucy | F | 12 | Disciple of Christ | English | Ontario | No Occupation Listed | 85 |
| 4 | olmstead | charlotte | F | 13 | Anglican | German | Ontario | No Occupation Listed | 101 |
| 1 | olmstead | david | M | 33 | Anglican | German | Ontario | Farmers, general and nfs | 101 |
| 10 | olmstead | david | M | 1 | Anglican | German | Ontario | No Occupation Listed | 101 |
| 9 | olmstead | edmund | M | 3 | Anglican | German | Ontario | No Occupation Listed | 101 |
| 3 | olmstead | frank | M | 15 | Anglican | German | Ontario | No Occupation Listed | 101 |
| 2 | olmstead | jane | F | 31 | Anglican | Irish | Ontario | No Occupation Listed | 101 |
| 5 | olmstead | louisa | F | 11 | Anglican | German | Ontario | No Occupation Listed | 101 |
| 6 | olmstead | maggie | F | 9 | Anglican | German | Ontario | No Occupation Listed | 101 |
| 8 | olmstead | olive | F | 5 | Anglican | German | Ontario | No Occupation Listed | 101 |
| 11 | olmstead | silena | F | 0 | Anglican | German | Ontario | No Occupation Listed | 101 |
| 7 | olmstead | william | M | 7 | Anglican | German | Ontario | No Occupation Listed | 101 |
| 17 | orser | andrew | M | 68 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 20 |
| 18 | orser | hanah | F | 62 | Episcopal Methodist | German | Ontario | No Occupation Listed | 20 |
| 19 | orser | mary | F | 32 | Episcopal Methodist | German | Ontario | No Occupation Listed | 20 |