Residents of Ancaster — Sub-district E, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 12 | oaks | alice | F | 20 | Anglican | English | England | No Occupation Listed | 100 |
| 18 | oaks | alice | F | 0 | Anglican | English | Ontario | No Occupation Listed | 100 |
| 16 | oaks | charles | M | 4 | Anglican | English | Ontario | No Occupation Listed | 100 |
| 14 | oaks | christopher | M | 6 | Anglican | English | Ontario | No Occupation Listed | 100 |
| 17 | oaks | george | M | 2 | Anglican | English | Ontario | No Occupation Listed | 100 |
| 4 | oaks | jennie | F | 16 | Episcopal Methodist | English | Ontario | No Occupation Listed | 128 |
| 13 | oaks | matilda | F | 12 | Anglican | English | Ontario | No Occupation Listed | 100 |
| 11 | oaks | thomas | M | 42 | Anglican | English | England | Cartwrights and wheelwrights | 100 |
| 15 | oaks | thomas | M | 5 | Anglican | English | Ontario | No Occupation Listed | 100 |
| 5 | oberlin | bertha | F | 19 | Episcopal Methodist | German | Ontario | No Occupation Listed | 101 |
| 9 | oberlin | clarey | F | 10 | Episcopal Methodist | German | Ontario | No Occupation Listed | 101 |
| 7 | oberlin | edward | M | 15 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 101 |
| 6 | oberlin | john | M | 17 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 101 |
| 4 | oberlin | sarah | F | 43 | Episcopal Methodist | German | Ontario | No Occupation Listed | 101 |
| 8 | oberlin | sophia | F | 12 | Episcopal Methodist | German | Ontario | No Occupation Listed | 101 |
| 3 | oberlin | william | M | 46 | Episcopal Methodist | German | Germany | Farmers, general and nfs | 101 |
| 4 | oddel | ann | F | 43 | Episcopal Methodist | German | Ontario | No Occupation Listed | 276 |
| 7 | oddel | charles | M | 13 | Episcopal Methodist | German | United States | No Occupation Listed | 276 |
| 9 | oddel | elcie | F | 8 | Episcopal Methodist | German | Ontario | No Occupation Listed | 276 |
| 3 | oddel | john | M | 50 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 276 |
| 6 | oddel | mary | F | 16 | Episcopal Methodist | German | Ontario | No Occupation Listed | 276 |
| 8 | oddel | penelepa | F | 10 | Episcopal Methodist | German | Ontario | No Occupation Listed | 276 |
| 14 | oddel | penelopa | F | 54 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 242 |
| 5 | oddel | susan | F | 23 | Episcopal Methodist | German | Ontario | No Occupation Listed | 276 |
| 21 | odell | catherine | F | 32 | Methodist | Scottish | Ontario | No Occupation Listed | 26 |
| 20 | odell | henery | M | 38 | Methodist | French | Ontario | Carpenters | 26 |
| 24 | odell | henery | M | 4 | Methodist | French | Ontario | No Occupation Listed | 26 |
| 25 | odell | mabel | F | 2 | Methodist | French | Ontario | No Occupation Listed | 26 |
| 19 | ofield | celista | F | 24 | Anglican | German | Ontario | No Occupation Listed | 304 |
| 17 | ofield | eliza | F | 52 | Anglican | German | Ontario | No Occupation Listed | 304 |
| 16 | ofield | george | M | 66 | Anglican | English | England | Farmers, general and nfs | 304 |
| 20 | ofield | george | M | 2 | Anglican | English | Ontario | No Occupation Listed | 304 |
| 18 | ofield | john | M | 30 | Anglican | English | Ontario | Farmers, general and nfs | 304 |
| 21 | ofield | william | M | 0 | Anglican | English | Ontario | No Occupation Listed | 304 |
| 16 | ohara | catherine | F | 45 | Roman Catholic | Irish | Ireland | No Occupation Listed | 18 |
| 17 | ohara | mary | F | 21 | Roman Catholic | Irish | Ireland | No Occupation Listed | 18 |
| 15 | ohara | richard | M | 46 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 18 |
| 18 | ohara | thomas | M | 13 | Roman Catholic | Irish | Ireland | No Occupation Listed | 18 |
| 25 | okes | augusta | F | 18 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 180 |
| 1 | okes | viclor | F | 0 | Episcopal Methodist | English | Ontario | No Occupation Listed | 180 |
| 24 | okes | william | M | 21 | Episcopal Methodist | English | Ontario | river drivers | 180 |
| 21 | olds | sarah | F | 31 | Episcopal Methodist | German | Ontario | No Occupation Listed | 270 |
| 16 | oles | horatio | M | 22 | Episcopal Methodist | German | Ontario | Labourers nfs | 40 |
| 17 | oles | slinea | F | 19 | Baptist | German | Ontario | No Occupation Listed | 40 |
| 1 | olmshed | adalena | F | 1 | Anglican | English | Ontario | No Occupation Listed | 19 |
| 25 | olmshed | charles | M | 10 | Anglican | English | Ontario | No Occupation Listed | 19 |
| 22 | olmshed | edward | M | 23 | Anglican | English | Ontario | Ministers of Religion | 19 |
| 23 | olmshed | grace | F | 18 | Anglican | English | Ontario | No Occupation Listed | 19 |
| 24 | olmshed | ingersol | M | 16 | Anglican | English | Ontario | Farmers, general and nfs | 19 |
| 21 | olmshed | l | F | 40 | Anglican | English | Ontario | No Occupation Listed | 19 |
| 20 | olmshed | moss | M | 50 | Anglican | English | Ontario | Farmers, general and nfs | 19 |
| 9 | olmshid | benj | M | 38 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 283 |
| 23 | olmshid | c | F | 20 | Episcopal Methodist | German | Ontario | No Occupation Listed | 269 |
| 24 | olmshid | flora | F | 1 | Episcopal Methodist | German | Ontario | No Occupation Listed | 269 |
| 13 | olmshid | grace | F | 7 | Episcopal Methodist | German | Ontario | No Occupation Listed | 283 |
| 20 | olmshid | herbet | M | 15 | Episcopal Methodist | German | Ontario | Clerk, nfs | 268 |
| 12 | olmshid | ida | F | 12 | Episcopal Methodist | German | Ontario | No Occupation Listed | 283 |
| 22 | olmshid | jacob | M | 28 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 269 |
| 11 | olmshid | joseph | M | 14 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 283 |
| 10 | olmshid | margaret | F | 36 | Episcopal Methodist | German | Ontario | No Occupation Listed | 283 |
| 14 | olmshid | mary | F | 2 | Episcopal Methodist | German | Ontario | No Occupation Listed | 283 |
| 17 | olmshid | samuel | M | 61 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 268 |
| 19 | olmshid | samuel | M | 18 | Episcopal Methodist | German | Ontario | Clerk, nfs | 268 |
| 18 | olmshid | sarah | F | 61 | Episcopal Methodist | German | Ontario | No Occupation Listed | 268 |
| 5 | oneil | arthur | M | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 7 | oneil | francis | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 8 | oneil | fred | M | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 2 | oneil | hannah | F | 38 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 9 | oneil | harry | M | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 1 | oneil | henry | M | 41 | Roman Catholic | Irish | Ontario | Tinsmiths and Tinners and Tinkers | 131 |
| 4 | oneil | jerome | M | 15 | Roman Catholic | Irish | Ontario | Tinsmiths and Tinners and Tinkers | 131 |
| 10 | oneil | josephine | F | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 6 | oneil | mary | F | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 3 | oneil | sarah | F | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 2 | orr | richard | M | 14 | Methodist | English | England | No Occupation Listed | 270 |
| 25 | orton | annie | F | 44 | Anglican | English | United States | No Occupation Listed | 117 |
| 3 | orton | harry | M | 12 | Anglican | English | Ontario | No Occupation Listed | 117 |
| 24 | orton | henry | M | 48 | Anglican | English | England | Medical Doctors and physicians (not UK) | 117 |
| 1 | orton | laura | F | 20 | Anglican | English | Ontario | No Occupation Listed | 117 |
| 2 | orton | thomas | M | 17 | Anglican | English | Ontario | No Occupation Listed | 117 |
| 14 | oughton | charles | M | 74 | Anglican | English | England | Gardeners nfs | 38 |
| 15 | oughton | jane | F | 67 | Anglican | Irish | Ireland | No Occupation Listed | 38 |