Residents of Picton, T-V — Sub-district A, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 13 | obrien | jane | F | 81 | Anglican | Irish | Ontario | No Occupation Listed | 189 |
| 2 | ohagan | daniel | M | 27 | Roman Catholic | Irish | New Brunswick | Ships Masters and captains (Sea or Inland Waterways) | 226 |
| 4 | ohagan | david | M | 25 | Roman Catholic | Irish | Ontario | Ships Masters and captains (Sea or Inland Waterways) | 226 |
| 5 | ohagan | deborah | F | 23 | Roman Catholic | Irish | Ontario | No Occupation Listed | 226 |
| 9 | ohagan | hugh | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 226 |
| 7 | ohagan | john | M | 17 | Roman Catholic | Irish | Ontario | Seamen | 226 |
| 6 | ohagan | mary | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 226 |
| 3 | ohagan | susan | F | 52 | Roman Catholic | Irish | Ireland | No Occupation Listed | 226 |
| 8 | ohagan | william | M | 14 | Roman Catholic | Irish | Ontario | Seamen | 226 |
| 2 | orchard | beatrice | F | 24 | Anglican | English | Ontario | No Occupation Listed | 7 |
| 3 | orchard | beatrice | F | 5 | Anglican | English | Ontario | No Occupation Listed | 7 |
| 1 | orchard | g | M | 31 | Anglican | English | England | No Occupation Listed | 7 |
| 11 | oreilly | jas | M | 55 | Roman Catholic | Irish | Ireland | Dealer, merchant etc. (Wholesale & retail trade) | 3 |
| 25 | orielly | ann | F | 33 | Roman Catholic | Irish | Ireland | No Occupation Listed | 277 |
| 2 | orielly | margaret | F | 35 | Roman Catholic | Irish | Ireland | No Occupation Listed | 277 |
| 1 | orielly | mary | F | 37 | Roman Catholic | Irish | Ireland | Servants nfs | 277 |
| 20 | orser | lydia | F | 26 | Methodist | English | Ontario | No Occupation Listed | 191 |
| 9 | oser | julia | F | 29 | Roman Catholic | French | Ontario | No Occupation Listed | 155 |
| 8 | oser | william | M | 28 | Roman Catholic | French | United States | Engineers (US) nfs | 155 |
| 18 | oshea | catharine | F | 35 | Roman Catholic | Irish | Ontario | No Occupation Listed | 84 |
| 21 | oshea | catharine | F | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 84 |
| 20 | oshea | daniel | M | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 84 |
| 19 | oshea | john | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 84 |
| 17 | oshea | michael | M | 57 | Roman Catholic | Irish | Ireland | Boot and shoemakers and repairers | 84 |
| 24 | ostrander | evevette | F | 3 | Methodist | Irish | Ontario | No Occupation Listed | 276 |
| 20 | ostrander | frances | F | 35 | Methodist | Irish | Ontario | No Occupation Listed | 276 |
| 21 | ostrander | georgiana | F | 15 | Methodist | Irish | Ontario | No Occupation Listed | 276 |
| 19 | ostrander | h | M | 40 | Methodist | Irish | Ontario | Farmers, general and nfs | 276 |
| 23 | ostrander | john | M | 11 | Methodist | Irish | Ontario | No Occupation Listed | 276 |
| 22 | ostrander | minnie | F | 13 | Methodist | Irish | Ontario | No Occupation Listed | 276 |
| 11 | otoole | margaret | F | 77 | Roman Catholic | Irish | Ireland | No Occupation Listed | 261 |
| 8 | owan | eliza | F | 36 | Anglican | Irish | Ontario | Milliners | 268 |
| 11 | owan | frank | M | 24 | Anglican | Irish | Ontario | Watch and Clock Makers | 268 |
| 10 | owan | louisa | F | 26 | Anglican | Irish | Ontario | No Occupation Listed | 268 |
| 9 | owan | thomas | M | 32 | Anglican | Irish | Ontario | Agent nfs | 268 |
| 21 | owens | albert | M | 18 | Anglican | Irish | Ontario | No Occupation Listed | 135 |
| 1 | owens | elizabeth | F | 48 | Presbyterian | Irish | Ontario | No Occupation Listed | 195 |
| 2 | owens | ella | F | 25 | Anglican | Irish | Ontario | No Occupation Listed | 195 |
| 18 | owens | hannah | F | 58 | Anglican | Irish | Ontario | No Occupation Listed | 135 |
| 19 | owens | hannah | F | 27 | Anglican | Irish | Ontario | No Occupation Listed | 135 |
| 20 | owens | mary | F | 24 | Anglican | Irish | Ontario | Teachers (unspecified) | 135 |
| 17 | owens | robert | M | 70 | Anglican | German | Ireland | No Occupation Listed | 292 |
| 25 | owens | william | M | 60 | Anglican | Irish | Ireland | No Occupation Listed | 195 |
| 3 | owens | william | M | 20 | Presbyterian | Irish | Ontario | No Occupation Listed | 195 |