Residents of Biddulph — Sub-district I, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 7 | oboyle | patrick | M | 20 | Roman Catholic | Irish | Ontario | river drivers | 126 |
| 7 | ocallaghan | elizabeth | F | 35 | Roman Catholic | Irish | Ireland | No Occupation Listed | 141 |
| 6 | ocallaghan | peter | M | 36 | Roman Catholic | Irish | Ontario | Butchers | 141 |
| 15 | odwyer | anthony | M | 24 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 29 |
| 17 | odwyer | catherine | F | 68 | Roman Catholic | Irish | Ontario | No Occupation Listed | 29 |
| 16 | odwyer | helena | F | 22 | Roman Catholic | Irish | Ontario | No Occupation Listed | 29 |
| 3 | ohearn | johannah | F | 35 | Roman Catholic | Irish | Ireland | No Occupation Listed | 113 |
| 2 | ohearn | patrick | M | 50 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 113 |
| 1 | olway | elizabeth | F | 75 | Baptist | Welsh | Wales | No Occupation Listed | 143 |
| 25 | olway | william | M | 84 | Baptist | English | England | No Occupation Listed | 143 |
| 13 | orr | thomas | M | 16 | Anglican | English | England | Domestic and House Servants | 59 |
| 13 | oryley | peter | M | 41 | Roman Catholic | Irish | Ireland | river drivers | 39 |
| 4 | oshea | patrick | M | 45 | Roman Catholic | Irish | Ireland | Agent nfs | 50 |
| 7 | owen | william | M | 32 | Anglican | English | England | Labourers nfs | 57 |