Residents of Thorold — Sub-district H, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 22 | obrian | annie | F | 6 | Presbyterian | Irish | Ontario | No Occupation Listed | 160 |
| 19 | obrian | catharine | F | 40 | Presbyterian | Scottish | Ontario | No Occupation Listed | 160 |
| 21 | obrian | jessie | F | 9 | Presbyterian | Irish | Ontario | No Occupation Listed | 160 |
| 18 | obrian | john | M | 45 | Methodist | Irish | Ontario | Engineers (US) nfs | 160 |
| 23 | obrian | mary | F | 2 | Presbyterian | Irish | Ontario | No Occupation Listed | 160 |
| 20 | obrian | william | M | 16 | Presbyterian | Irish | Ontario | No Occupation Listed | 160 |
| 21 | obrien | catharine | F | 37 | Roman Catholic | Irish | Ireland | No Occupation Listed | 10 |
| 22 | obrien | catharine | F | 54 | Roman Catholic | Irish | Ireland | No Occupation Listed | 55 |
| 21 | obrien | danial | M | 70 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 55 |
| 1 | obrien | edward | M | 22 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 55 |
| 24 | obrien | hannah | F | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 55 |
| 2 | obrien | james | M | 24 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 55 |
| 22 | obrien | john | M | 16 | Roman Catholic | Irish | Ontario | Labourers nfs | 10 |
| 25 | obrien | libbie | F | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 55 |
| 23 | obrien | timothy | M | 28 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 55 |
| 9 | oconnor | andrew | M | 49 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 12 |
| 14 | oconnor | catharine | F | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 12 |
| 15 | oconnor | florence | F | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 12 |
| 10 | oconnor | johanna | F | 44 | Roman Catholic | Irish | Ireland | No Occupation Listed | 12 |
| 11 | oconnor | john | M | 19 | Roman Catholic | Irish | Ontario | Seamen | 12 |
| 16 | oconnor | joseph | M | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 12 |
| 13 | oconnor | mary | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 12 |
| 12 | oconnor | thomas | M | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 12 |
| 23 | offspring | agness | F | 10 | Roman Catholic | English | Ontario | No Occupation Listed | 216 |
| 7 | offspring | annie | F | 3 | Roman Catholic | English | Ireland | No Occupation Listed | 121 |
| 21 | offspring | catharine | F | 31 | Roman Catholic | Irish | Ontario | No Occupation Listed | 152 |
| 13 | offspring | elizabeth | F | 60 | Roman Catholic | Irish | Ireland | No Occupation Listed | 143 |
| 2 | offspring | george | M | 27 | Roman Catholic | English | Ireland | Ships Masters and captains (Sea or Inland Waterways) | 121 |
| 4 | offspring | george | M | 5 | Roman Catholic | English | Ireland | No Occupation Listed | 121 |
| 14 | offspring | george | M | 60 | Anglican | English | England | Blacksmiths | 143 |
| 22 | offspring | george | M | 13 | Roman Catholic | English | Ontario | No Occupation Listed | 216 |
| 24 | offspring | jane | F | 0 | Roman Catholic | English | Ontario | No Occupation Listed | 152 |
| 21 | offspring | jane | F | 35 | Roman Catholic | Irish | Ontario | No Occupation Listed | 216 |
| 20 | offspring | john | M | 31 | Roman Catholic | English | Ontario | Ship’s carpenter | 152 |
| 3 | offspring | lizza | F | 29 | Roman Catholic | Irish | Ireland | No Occupation Listed | 121 |
| 6 | offspring | lizza | F | 3 | Roman Catholic | English | Ireland | No Occupation Listed | 121 |
| 25 | offspring | maggie | F | 6 | Roman Catholic | English | Ontario | No Occupation Listed | 216 |
| 5 | offspring | mary | F | 5 | Roman Catholic | English | Ireland | No Occupation Listed | 121 |
| 22 | offspring | mary | F | 7 | Roman Catholic | English | Ontario | No Occupation Listed | 152 |
| 24 | offspring | mary | F | 8 | Roman Catholic | English | Ontario | No Occupation Listed | 216 |
| 20 | offspring | robert | M | 37 | Roman Catholic | English | Ontario | Ship’s carpenter | 216 |
| 1 | offspring | sarah | F | 3 | Roman Catholic | English | Ontario | No Occupation Listed | 216 |
| 23 | offspring | teresa | F | 4 | Roman Catholic | English | Ontario | No Occupation Listed | 152 |
| 12 | oleary | bartholemed | M | 40 | Roman Catholic | Irish | Ireland | Crane and hoist operators | 58 |
| 13 | oleary | daniel | M | 48 | Roman Catholic | Irish | Ireland | Lock keepers | 173 |
| 14 | oleary | johanna | F | 43 | Roman Catholic | Irish | Ireland | No Occupation Listed | 173 |
| 13 | oleary | juannah | F | 32 | Roman Catholic | Irish | Ireland | No Occupation Listed | 58 |
| 19 | oleary | mary | F | 65 | Roman Catholic | Irish | Ireland | No Occupation Listed | 98 |
| 23 | onaill | catherine | F | 67 | Roman Catholic | Irish | Ireland | No Occupation Listed | 60 |
| 25 | onaill | catherine | F | 30 | Roman Catholic | Irish | Ontario | Servants nfs | 60 |
| 1 | onaill | catherine | F | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 60 |
| 22 | onaill | john | M | 93 | Roman Catholic | Irish | Ireland | Superintendents and managers, railway | 60 |
| 24 | onaill | john | M | 32 | Roman Catholic | Irish | Ontario | Labourers nfs | 60 |
| 2 | oppspring | cecelia | F | 1 | Roman Catholic | English | Ontario | No Occupation Listed | 216 |
| 12 | orr | andrew | M | 0 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 11 | orr | francis | M | 2 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 10 | orr | jane | F | 29 | Presbyterian | Scottish | Scotland | No Occupation Listed | 43 |
| 13 | orr | josephine | F | 26 | Presbyterian | Scottish | Ontario | No Occupation Listed | 43 |
| 14 | orr | olive | F | 66 | Free Baptist | English | Ontario | No Occupation Listed | 43 |
| 9 | orr | william | M | 30 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 43 |
| 11 | orth | francis | M | 14 | Methodist | German | Ontario | No Occupation Listed | 185 |
| 12 | orth | mary | F | 11 | Methodist | German | Ontario | No Occupation Listed | 185 |
| 10 | orth | newman | M | 15 | Methodist | German | Ontario | Farmers, general and nfs | 185 |
| 9 | orth | susannah | F | 39 | Methodist | Unknown | Ontario | No Occupation Listed | 185 |
| 18 | overholt | albert | M | 22 | Methodist | German | Ontario | Farmers, general and nfs | 128 |
| 3 | overholt | arthur | M | 6 | Baptist | German | Ontario | No Occupation Listed | 13 |
| 17 | overholt | caroline | F | 45 | Methodist | German | Ontario | No Occupation Listed | 128 |
| 1 | overholt | dexter | M | 37 | Baptist | German | Ontario | Farmers, general and nfs | 13 |
| 21 | overholt | eliza | F | 8 | Methodist | German | Ontario | No Occupation Listed | 128 |
| 22 | overholt | george | M | 5 | Methodist | German | Ontario | No Occupation Listed | 128 |
| 11 | overholt | hellen | F | 62 | Baptist | Blank | Ontario | No Occupation Listed | 29 |
| 16 | overholt | john | M | 56 | Methodist | German | Ontario | Farmers, general and nfs | 128 |
| 2 | overholt | marion | F | 33 | Baptist | Scottish | Ontario | No Occupation Listed | 13 |
| 4 | overholt | martha | F | 5 | Baptist | German | Ontario | No Occupation Listed | 13 |
| 10 | overholt | mathew | M | 66 | Baptist | German | Ontario | No Occupation Listed | 29 |
| 19 | overholt | rhody | F | 17 | Methodist | German | Ontario | No Occupation Listed | 128 |
| 20 | overholt | william | M | 11 | Methodist | German | Ontario | No Occupation Listed | 128 |
| 22 | oxley | albert | M | 21 | Church of Scotland | English | Ontario | Bank tellers | 20 |
| 24 | oxley | chrisena | F | 14 | Anglican | English | Ontario | No Occupation Listed | 12 |
| 23 | oxley | elizabeth | F | 17 | Church of Scotland | English | Ontario | No Occupation Listed | 20 |
| 7 | oxley | harriet | F | 75 | Quaker/Society of Friends | English | Ontario | No Occupation Listed | 21 |
| 22 | oxley | isibella | F | 23 | Anglican | English | Ontario | No Occupation Listed | 12 |
| 23 | oxley | louisa | F | 17 | Anglican | English | Ontario | No Occupation Listed | 12 |
| 8 | oxley | lydia | F | 73 | Quaker/Society of Friends | English | United States | No Occupation Listed | 21 |
| 24 | oxley | malcolm | M | 14 | Church of Scotland | English | Ontario | No Occupation Listed | 20 |
| 25 | oxley | mcdonald | M | 13 | Anglican | English | Ontario | No Occupation Listed | 12 |
| 21 | oxley | mrs | F | 68 | Presbyterian | Scottish | Scotland | No Occupation Listed | 12 |
| 21 | oxley | mrs | F | 46 | Church of Scotland | Scottish | Scotland | No Occupation Listed | 20 |
| 25 | oxley | walter | M | 12 | Church of Scotland | English | Ontario | No Occupation Listed | 20 |