Residents of Williamsburg — Sub-district C, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 22 | obrien | albert | M | 26 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 35 |
| 22 | ohair | charlotte | F | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 145 |
| 19 | ohair | margaret | F | 54 | Roman Catholic | Irish | Ireland | No Occupation Listed | 145 |
| 18 | ohair | peter | M | 64 | Roman Catholic | Irish | Ireland | Labourers nfs | 145 |
| 20 | ohair | peter | M | 16 | Roman Catholic | Irish | Ontario | Labourers nfs | 145 |
| 21 | ohair | william | M | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 145 |
| 11 | oneil | alice | F | 11 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 48 |
| 7 | oneil | edward | M | 18 | Episcopal Methodist | Irish | Ontario | Labourers nfs | 48 |
| 8 | oneil | elizabeth | F | 15 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 48 |
| 13 | oneil | flora | F | 5 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 48 |
| 9 | oneil | george | M | 13 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 48 |
| 6 | oneil | james | M | 20 | Episcopal Methodist | Irish | Ontario | Labourers nfs | 48 |
| 22 | oneil | jane | F | 74 | Lutheran | Irish | Ireland | No Occupation Listed | 69 |
| 23 | oneil | jenny | F | 25 | Lutheran | Irish | Ontario | Teachers (unspecified) | 69 |
| 12 | oneil | john | M | 7 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 48 |
| 5 | oneil | marget | F | 46 | Episcopal Methodist | English | Ontario | No Occupation Listed | 48 |
| 21 | oneil | patrick | M | 80 | Roman Catholic | Irish | Ireland | Labourers nfs | 69 |
| 10 | oneil | samuel | M | 9 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 48 |
| 4 | oniel | patrick | M | 50 | Anglican | Irish | Ireland | Labourers nfs | 48 |
| 11 | oshangency | annie | F | 12 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 213 |
| 7 | oshangency | cathrine | F | 40 | Episcopal Methodist | German | Ontario | No Occupation Listed | 213 |
| 9 | oshangency | coldweld | M | 17 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 213 |
| 12 | oshangency | emma | F | 7 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 213 |
| 13 | oshangency | eve | F | 5 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 213 |
| 14 | oshangency | james | M | 2 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 213 |
| 8 | oshangency | sarah | F | 20 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 213 |
| 10 | oshangency | sephfiens | M | 14 | Episcopal Methodist | Irish | Ontario | No Occupation Listed | 213 |
| 6 | oshangency | trenn | M | 46 | Episcopal Methodist | Irish | Ontario | Farmers, general and nfs | 213 |
| 5 | oshaughnssy | adam | M | 18 | Methodist | Blank | Ontario | Farmers, general and nfs | 125 |
| 2 | oshaughnssy | chesly | M | 24 | Methodist | German | Ontario | Carpenters | 125 |
| 6 | oshaughnssy | henery | M | 1 | Methodist | Blank | Ontario | Farmers, general and nfs | 125 |
| 25 | oshaughnssy | michel | M | 67 | Methodist | Irish | Ontario | Farmers, general and nfs | 125 |
| 1 | oshaughnssy | sarah | F | 68 | Lutheran | German | Ontario | No Occupation Listed | 125 |
| 3 | oshaughnssy | sarah | F | 22 | Methodist | Irish | Ontario | No Occupation Listed | 125 |
| 4 | oshaughnssy | william | M | 20 | Methodist | Irish | Ontario | Farmers, general and nfs | 125 |
| 10 | ouderkirk | agness | F | 16 | Presbyterian | German | Ontario | No Occupation Listed | 97 |
| 10 | ouderkirk | amos | M | 19 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 124 |
| 11 | ouderkirk | anthony | M | 29 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 124 |
| 10 | ouderkirk | aron | M | 32 | Lutheran | German | Ontario | Farmers, general and nfs | 168 |
| 8 | ouderkirk | edward | M | 20 | Presbyterian | German | Ontario | Farmers, general and nfs | 97 |
| 13 | ouderkirk | emeline | F | 4 | Episcopal Methodist | German | Ontario | No Occupation Listed | 124 |
| 14 | ouderkirk | eva | F | 2 | Episcopal Methodist | German | Ontario | No Occupation Listed | 124 |
| 7 | ouderkirk | franklin | M | 22 | Presbyterian | German | Ontario | Farmers, general and nfs | 97 |
| 12 | ouderkirk | hannah | F | 26 | Episcopal Methodist | German | Ontario | No Occupation Listed | 124 |
| 11 | ouderkirk | harry | M | 9 | Presbyterian | German | Ontario | No Occupation Listed | 97 |
| 5 | ouderkirk | henry | M | 45 | Presbyterian | German | Ontario | Farmers, general and nfs | 97 |
| 9 | ouderkirk | julia | F | 54 | Episcopal Methodist | German | Ontario | No Occupation Listed | 124 |
| 8 | ouderkirk | levi | M | 57 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 124 |
| 12 | ouderkirk | loren | M | 11 | Lutheran | German | Ontario | No Occupation Listed | 168 |
| 11 | ouderkirk | malinda | F | 30 | Lutheran | German | Ontario | No Occupation Listed | 168 |
| 13 | ouderkirk | margaret | F | 4 | Lutheran | German | Ontario | No Occupation Listed | 168 |
| 6 | ouderkirk | marget | F | 44 | Presbyterian | Scottish | Scotland | No Occupation Listed | 97 |
| 9 | ouderkirk | minnie | F | 18 | Presbyterian | German | Ontario | No Occupation Listed | 97 |
| 15 | ouderkirk | nancy | F | 0 | Episcopal Methodist | German | Ontario | No Occupation Listed | 124 |
| 14 | ouderkirk | nancy | F | 2 | Lutheran | German | Ontario | No Occupation Listed | 168 |
| 12 | ouderkirk | william | M | 7 | Presbyterian | German | Ontario | No Occupation Listed | 97 |