Residents of Thurlow — Sub-district A, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 4 | obrien | caleb | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 2 | obrien | eliza | F | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 24 | obrien | elizabeth | F | 33 | Roman Catholic | Irish | Ireland | No Occupation Listed | 88 |
| 5 | obrien | hanah | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 25 | obrien | james | M | 29 | Roman Catholic | Irish | Ontario | No Occupation Listed | 82 |
| 1 | obrien | john | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 24 | obrien | mary | F | 52 | Roman Catholic | Irish | Ontario | No Occupation Listed | 82 |
| 25 | obrien | mary | F | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 23 | obrien | peter | M | 36 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 88 |
| 23 | obrien | william | M | 61 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 82 |
| 3 | obrien | willie | M | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 88 |
| 21 | obrine | anna | F | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 274 |
| 17 | obrine | christian | M | 69 | Roman Catholic | Irish | Ontario | Labourers nfs | 274 |
| 20 | obrine | george | M | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 274 |
| 19 | obrine | john | M | 75 | Roman Catholic | Irish | Ontario | No Occupation Listed | 274 |
| 18 | obrine | margaret | F | 50 | Roman Catholic | Irish | Ontario | No Occupation Listed | 274 |
| 9 | ocamb | allen | M | 15 | Presbyterian | Irish | Ontario | No Occupation Listed | 53 |
| 14 | ocamb | alonzo | M | 4 | Methodist | French | Ontario | No Occupation Listed | 40 |
| 10 | ocamb | bertha | F | 11 | Presbyterian | Irish | Ontario | No Occupation Listed | 53 |
| 10 | ocamb | diania | F | 67 | Methodist | German | Ontario | No Occupation Listed | 77 |
| 8 | ocamb | ettie | F | 17 | Presbyterian | Irish | Ontario | No Occupation Listed | 53 |
| 13 | ocamb | feba | F | 41 | Methodist | German | Ontario | No Occupation Listed | 40 |
| 11 | ocamb | george | M | 20 | Methodist | Blank | Ontario | No Occupation Listed | 77 |
| 12 | ocamb | john | M | 54 | Methodist | French | Ontario | Carpenters | 40 |
| 15 | ocamb | john | M | 16 | Methodist | French | Ontario | No Occupation Listed | 40 |
| 6 | ocamb | marria | F | 47 | Presbyterian | Irish | — | No Occupation Listed | 53 |
| 11 | ocamb | matilda | F | 8 | Presbyterian | Irish | Ontario | No Occupation Listed | 53 |
| 7 | ocamb | nellie | F | 23 | Presbyterian | Irish | Ontario | No Occupation Listed | 53 |
| 21 | ockerman | benjamin | M | 40 | Anglican | German | Ontario | Labourers nfs | 170 |
| 22 | ockerman | jane | F | 35 | Anglican | Irish | Ontario | No Occupation Listed | 170 |
| 23 | ockerman | john | M | 15 | Anglican | German | Ontario | No Occupation Listed | 170 |
| 24 | ockerman | wellington | M | 10 | Anglican | German | Ontario | No Occupation Listed | 170 |
| 16 | oliver | fred | M | 1 | Episcopal Methodist | German | Ontario | No Occupation Listed | 100 |
| 10 | oliver | henry | M | 35 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 100 |
| 12 | oliver | james | M | 8 | Episcopal Methodist | German | Ontario | No Occupation Listed | 100 |
| 14 | oliver | minnie | F | 5 | Episcopal Methodist | German | Ontario | No Occupation Listed | 100 |
| 15 | oliver | rosa | F | 3 | Episcopal Methodist | German | Ontario | No Occupation Listed | 100 |
| 11 | oliver | susan | F | 31 | Episcopal Methodist | Scottish | Ontario | No Occupation Listed | 100 |
| 13 | oliver | william | M | 6 | Episcopal Methodist | German | Ontario | No Occupation Listed | 100 |
| 4 | oneil | ann | F | 47 | Roman Catholic | Irish | Ireland | No Occupation Listed | 39 |
| 11 | oneil | daniel | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 9 | oneil | francis | M | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 6 | oneil | james | M | 20 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 39 |
| 3 | oneil | luke | M | 52 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 39 |
| 10 | oneil | luke | M | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 5 | oneil | mary | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 8 | oneil | thomas | M | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 7 | oneil | william | M | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 9 | ormand | abraham | M | 15 | Presbyterian | Scottish | Ontario | No Occupation Listed | 117 |
| 10 | ormand | ann | F | 32 | Presbyterian | Scottish | Scotland | Servants nfs | 117 |
| 11 | ormand | bella | F | 24 | Presbyterian | Scottish | Ontario | Servants nfs | 117 |
| 8 | ormand | george | M | 26 | Presbyterian | Scottish | Ontario | Engineers (US) nfs | 117 |
| 13 | ormand | george | M | 6 | Presbyterian | Scottish | Ontario | No Occupation Listed | 117 |
| 12 | ormand | margaret | F | 17 | Presbyterian | Scottish | Ontario | No Occupation Listed | 117 |
| 7 | ormand | thomas | M | 29 | Presbyterian | Scottish | Scotland | Stationary engineers and engine men | 117 |
| 5 | ormand | william | M | 37 | Presbyterian | Scottish | Scotland | Gardeners nfs | 117 |
| 6 | ormand | william | M | 35 | Presbyterian | Scottish | Scotland | Labourers nfs | 117 |
| 19 | orr | david | M | 19 | Presbyterian | Irish | Ontario | No Occupation Listed | 46 |
| 25 | orr | edda | M | 6 | Presbyterian | Irish | Ontario | No Occupation Listed | 46 |
| 20 | orr | emma | F | 17 | Presbyterian | Irish | Ontario | Tailors and tailoresses | 46 |
| 22 | orr | george | M | 13 | Presbyterian | Irish | Ontario | No Occupation Listed | 46 |
| 24 | orr | john | M | 8 | Presbyterian | Irish | Ontario | No Occupation Listed | 46 |
| 23 | orr | margaret | F | 10 | Presbyterian | Irish | Ontario | No Occupation Listed | 46 |
| 17 | orr | mary | F | 48 | Presbyterian | English | Ontario | No Occupation Listed | 46 |
| 21 | orr | minna | F | 15 | Presbyterian | Irish | Ontario | No Occupation Listed | 46 |
| 1 | orr | sarah | F | 3 | Presbyterian | Irish | Ontario | No Occupation Listed | 46 |
| 16 | orr | william | M | 55 | Presbyterian | Irish | Ireland | Farmers, general and nfs | 46 |
| 18 | orr | william | M | 21 | Presbyterian | Irish | Ontario | No Occupation Listed | 46 |
| 20 | orrill | edward | M | 40 | Methodist | English | England | Farmers, general and nfs | 203 |
| 21 | orrill | mary | F | 36 | Methodist | English | England | No Occupation Listed | 203 |
| 20 | oshea | james | M | 16 | Anglican | Irish | Ontario | river drivers | 191 |
| 17 | ostrom | arthur | M | 20 | Methodist | German | Ontario | Labourers nfs | 88 |
| 1 | ostrom | edith | F | 7 | Methodist | German | Ontario | No Occupation Listed | 79 |
| 25 | ostrom | frankie | F | 9 | Methodist | German | Ontario | No Occupation Listed | 79 |
| 18 | ostrom | frederick | M | 18 | Methodist | German | Ontario | No Occupation Listed | 88 |
| 23 | ostrom | george | M | 38 | Methodist | German | Ontario | Blacksmiths | 79 |
| 2 | ostrom | jane | F | 5 | Methodist | German | Ontario | No Occupation Listed | 79 |
| 24 | ostrom | mary | F | 32 | Methodist | German | Ontario | No Occupation Listed | 79 |
| 14 | outwaters | benjamin | M | 5 | Methodist | German | Ontario | No Occupation Listed | 4 |
| 13 | outwaters | blanche | F | 8 | Methodist | German | Ontario | No Occupation Listed | 4 |
| 8 | outwaters | daniel | M | 65 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 3 |
| 10 | outwaters | edgar | M | 35 | Methodist | German | Ontario | Farmers, general and nfs | 4 |
| 9 | outwaters | rachel | F | 59 | Episcopal Methodist | German | Ontario | No Occupation Listed | 3 |
| 11 | outwaters | sarah | F | 34 | Methodist | German | Ontario | No Occupation Listed | 4 |
| 12 | outwaters | steward | M | 12 | Methodist | German | Ontario | No Occupation Listed | 4 |