Residents of Barton — Sub-district C, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 7 | o_r_ | ann | F | 30 | Roman Catholic | Irish | Ireland | No Occupation Listed | 114 |
| 7 | obrien | edw | M | 56 | Roman Catholic | Irish | Ireland | Labourers nfs | 137 |
| 24 | obrien | kate | F | 35 | Roman Catholic | Irish | Ireland | Servants nfs | 114 |
| 8 | obrien | rosanna | F | 48 | Roman Catholic | Irish | Ireland | No Occupation Listed | 137 |
| 11 | obrien | wm | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 137 |
| 25 | oconell | james | M | 38 | Roman Catholic | Irish | Ireland | Stewards | 180 |
| 3 | oconnor | mary | F | 64 | Roman Catholic | Irish | Ireland | No Occupation Listed | 35 |
| 24 | oconnor | michael | M | 42 | Roman Catholic | Irish | Ontario | Blacksmiths | 293 |
| 7 | oday | dennis | M | 65 | Roman Catholic | Irish | Ireland | Tailors and tailoresses | 72 |
| 25 | oday | james | M | 41 | Roman Catholic | Irish | Ireland | Labourers nfs | 293 |
| 19 | ogg | charles | M | 32 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 252 |
| 18 | ogg | elizabeth | F | 70 | Presbyterian | Scottish | Scotland | No Occupation Listed | 252 |
| 17 | ogg | william | M | 60 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 252 |
| 21 | ogilve | jane | F | 20 | Presbyterian | Scottish | Ontario | No Occupation Listed | 231 |
| 6 | okeefe | ann | F | 37 | Roman Catholic | Irish | Ireland | Teachers (unspecified) | 293 |
| 21 | okeeffe | david | M | 55 | Roman Catholic | Irish | Ireland | Surveyors, general and nfs | 85 |
| 23 | okeeffe | david | M | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 85 |
| 25 | okeeffe | john | M | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 85 |
| 22 | okeeffe | margeret | F | 53 | Roman Catholic | Irish | Ireland | No Occupation Listed | 85 |
| 24 | okeeffe | william | M | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 85 |
| 19 | okeiff | ellin | F | 0 | | Blank | — | No Occupation Listed | 293 |
| 4 | oleary | mary | F | 36 | Roman Catholic | Blank | Ireland | No Occupation Listed | 293 |
| 13 | oliver | catherine | F | 0 | | Blank | — | No Occupation Listed | 293 |
| 5 | oliver | eliza | F | 41 | Methodist | Blank | Ireland | No Occupation Listed | 293 |
| 10 | oliver | elizabeth | F | 21 | Presbyterian | Irish | England | No Occupation Listed | 182 |
| 9 | oliver | john | M | 44 | Presbyterian | Irish | Ireland | Hotel Keepers and Managers | 182 |
| 5 | oliver | thomas | M | | Anglican | English | England | Carpenters | 293 |
| 1 | oneil | ellen | F | 52 | Roman Catholic | Irish | Ireland | No Occupation Listed | 219 |
| 2 | oneil | michael | M | 26 | Roman Catholic | Irish | Ireland | No Occupation Listed | 219 |
| 23 | orchard | elizabeth | F | 20 | Presbyterian | Dutch | Ontario | No Occupation Listed | 110 |
| 24 | orchard | nelly | F | 1 | Presbyterian | English | Ontario | No Occupation Listed | 110 |
| 22 | orchard | thomas | M | 28 | Anglican | English | England | Bakers | 110 |
| 3 | orr | john | M | 0 | | English | — | No Occupation Listed | 293 |
| 7 | orr | sabina | F | 25 | Methodist | Blank | — | No Occupation Listed | 293 |
| 20 | ortwein | alven | F | 49 | Roman Catholic | German | Germany | No Occupation Listed | 185 |
| 19 | ortwein | charles | M | 50 | Roman Catholic | German | Germany | Butchers | 185 |
| 22 | ortwein | charles | M | 18 | Roman Catholic | German | Germany | No Occupation Listed | 185 |
| 21 | ortwein | william | M | 19 | Roman Catholic | German | Germany | No Occupation Listed | 185 |
| 9 | orvis | annie | F | 20 | Methodist | Scottish | Ontario | Servants nfs | 280 |
| 3 | osullivan | allace | F | 48 | Roman Catholic | Irish | Ireland | No Occupation Listed | 90 |
| 4 | osullivan | armand | M | 24 | Roman Catholic | Irish | Ontario | Clerk, nfs | 90 |
| 7 | osullivan | cecelia | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 8 | osullivan | dominic | M | 18 | Roman Catholic | Irish | Ontario | Metal moulders and coremakers and workers in… | 90 |
| 5 | osullivan | emily | F | 23 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 6 | osullivan | frances | M | 22 | Roman Catholic | Irish | Ontario | Metal moulders and coremakers and workers in… | 90 |
| 9 | osullivan | henry | M | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 2 | osullivan | morris | M | 52 | Roman Catholic | Irish | Ireland | Metal moulders and coremakers and workers in… | 90 |
| 4 | osullivan | roderick | M | 44 | Roman Catholic | Irish | Ireland | Carpenters | 293 |
| 10 | osullivan | william | M | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 3 | ott | hiram | M | 52 | | Blank | Ontario | Farmers, general and nfs | 293 |
| 1 | ott | reuben | M | 21 | | Blank | Ontario | Farmers, general and nfs | 293 |
| 21 | oxley | allace | F | 2 | Anglican | English | Ontario | No Occupation Listed | 12 |
| 18 | oxley | anny | F | 7 | Anglican | English | Ontario | No Occupation Listed | 12 |
| 16 | oxley | emily | F | 12 | Anglican | English | England | No Occupation Listed | 12 |
| 17 | oxley | fanny | F | 9 | Anglican | English | Ontario | No Occupation Listed | 12 |
| 13 | oxley | mary | F | 38 | Anglican | English | England | No Occupation Listed | 12 |
| 14 | oxley | rachael | F | 16 | Anglican | English | England | No Occupation Listed | 12 |
| 15 | oxley | robert | M | 14 | Anglican | English | England | No Occupation Listed | 12 |
| 12 | oxley | tho | M | 40 | Anglican | English | England | Butchers | 12 |
| 20 | oxley | walter | M | 4 | Anglican | English | Ontario | No Occupation Listed | 12 |
| 19 | oxley | william | M | 6 | Anglican | English | Ontario | No Occupation Listed | 12 |