Residents of Cambridge — Sub-district B, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 1 | obyrne | anestas | F | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 25 | obyrne | archd | M | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 13 | obyrne | bernard | M | 44 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 95 |
| 18 | obyrne | bernard | M | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 19 | obyrne | catherine | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 7 | obyrne | catherine | F | 33 | Roman Catholic | Irish | Ontario | No Occupation Listed | 96 |
| 16 | obyrne | catherine | F | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 21 | obyrne | daniel | M | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 12 | obyrne | daniel | M | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 23 | obyrne | elisabeth | F | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 13 | obyrne | elisabeth | F | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 14 | obyrne | ellen | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 95 |
| 17 | obyrne | ellen | F | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 2 | obyrne | francis | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 24 | obyrne | james | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 8 | obyrne | james | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 96 |
| 6 | obyrne | jane | F | 70 | Roman Catholic | Irish | Ireland | No Occupation Listed | 96 |
| 15 | obyrne | jennie | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 15 | obyrne | john | M | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 3 | obyrne | john | M | 38 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 96 |
| 18 | obyrne | john | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 5 | obyrne | malcom | M | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 96 |
| 20 | obyrne | margret | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 19 | obyrne | margret | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 16 | obyrne | mary | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 4 | obyrne | mary | F | 36 | Roman Catholic | Irish | Ireland | No Occupation Listed | 96 |
| 14 | obyrne | mary | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 22 | obyrne | michel | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 95 |
| 11 | obyrne | patrick | M | 48 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 97 |
| 17 | obyrne | rebecka | F | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 6 | ohara | james | M | 39 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 259 |
| 5 | olinnett | adeleise | F | 45 | Roman Catholic | French | Quebec | No Occupation Listed | 206 |
| 4 | olinnett | francis | M | 38 | Roman Catholic | French | Quebec | Farmers, general and nfs | 206 |
| 8 | olinnett | john | M | 2 | Roman Catholic | French | Ontario | No Occupation Listed | 206 |
| 7 | olinnett | sandy | M | 6 | Roman Catholic | French | Ontario | No Occupation Listed | 206 |
| 6 | olinnett | sopherine | F | 18 | Roman Catholic | French | Quebec | No Occupation Listed | 206 |
| 4 | oneil | cornelies | M | 33 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 36 |
| 6 | oneil | daniel | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 36 |
| 5 | oneil | elisa | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 36 |
| 7 | oneil | john | M | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 36 |
| 3 | oneile | adeline | F | 52 | Roman Catholic | French | Quebec | No Occupation Listed | 238 |
| 4 | oneile | andrew | M | 24 | Roman Catholic | Irish | Ontario | Labourers nfs | 238 |
| 7 | oneile | daniel | M | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 238 |
| 2 | oneile | david | M | 60 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 238 |
| 5 | oneile | elisabeth | F | 23 | Roman Catholic | Irish | Ontario | No Occupation Listed | 238 |
| 6 | oneile | ellen | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 238 |
| 8 | oneile | james | M | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 238 |
| 9 | oneile | leon | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 238 |
| 4 | oneile | michele | M | 28 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 242 |
| 5 | oneile | olive | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 242 |
| 10 | oneile | thomas | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 238 |
| 21 | orno | alfred | M | 4 | Roman Catholic | French | Ontario | No Occupation Listed | 173 |
| 18 | orno | andrei | M | 10 | Roman Catholic | French | Ontario | No Occupation Listed | 173 |
| 15 | orno | batise | M | 42 | Roman Catholic | French | Quebec | Farmers, general and nfs | 173 |
| 17 | orno | jean | M | 14 | Roman Catholic | French | Quebec | No Occupation Listed | 173 |
| 19 | orno | magleun | M | 8 | Roman Catholic | French | Ontario | No Occupation Listed | 173 |
| 22 | orno | napolion | M | 2 | Roman Catholic | French | Ontario | No Occupation Listed | 173 |
| 16 | orno | oliseun | F | 33 | Roman Catholic | French | Quebec | No Occupation Listed | 173 |
| 20 | orno | phelix | M | 6 | Roman Catholic | French | Ontario | No Occupation Listed | 173 |
| 16 | ossalew | elair | M | 25 | Roman Catholic | French | Quebec | Farmers, general and nfs | 218 |
| 18 | ossalew | henry | M | 0 | Roman Catholic | French | Ontario | No Occupation Listed | 218 |
| 17 | ossalew | margret | F | 22 | Roman Catholic | French | Quebec | No Occupation Listed | 218 |