Residents of Plympton — Sub-district K, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 5 | obrien | ann | F | 60 | Roman Catholic | Irish | Ireland | No Occupation Listed | 368 |
| 3 | obrien | catherine | F | 25 | Roman Catholic | Irish | Ontario | No Occupation Listed | 368 |
| 24 | obrien | david | M | 11 | Presbyterian | Irish | Ontario | No Occupation Listed | 231 |
| 25 | obrien | elizabeth | F | 9 | Presbyterian | Irish | Ontario | No Occupation Listed | 231 |
| 22 | obrien | j | F | 14 | Presbyterian | Irish | Ontario | No Occupation Listed | 231 |
| 4 | obrien | james | M | 23 | Roman Catholic | Irish | Ontario | No Occupation Listed | 368 |
| 2 | obrien | john | M | 28 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 368 |
| 21 | obrien | julia | F | 34 | Presbyterian | German | Ontario | No Occupation Listed | 231 |
| 20 | obrien | william | M | 44 | Presbyterian | Irish | Ontario | Labourers nfs | 231 |
| 23 | obrien | william | M | 12 | Presbyterian | Irish | Ontario | No Occupation Listed | 231 |
| 8 | obrine | bridget | F | 70 | Roman Catholic | Irish | Ireland | No Occupation Listed | 67 |
| 7 | obrine | corneilus | M | 32 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 67 |
| 22 | odell | g | M | 21 | Episcopal | German | Ontario | Labourers nfs | 276 |
| 25 | odonald | james | M | 43 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 125 |
| 15 | odonnald | ann | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 230 |
| 6 | odonnald | charles | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 21 | odonnald | edmond | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 230 |
| 20 | odonnald | eliza | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 230 |
| 4 | odonnald | james | M | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 17 | odonnald | james | M | 13 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 230 |
| 5 | odonnald | john | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 16 | odonnald | john | M | 15 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 230 |
| 3 | odonnald | maggie | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 1 | odonnald | mary | F | 45 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 2 | odonnald | mary | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 14 | odonnald | mather | M | 40 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 230 |
| 18 | odonnald | mathew | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 230 |
| 19 | odonnald | william | M | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 230 |
| 6 | oliver | e | F | 24 | Methodist | Scottish | Ontario | Dressmakers | 251 |
| 9 | oliver | john | M | 16 | Methodist | Scottish | Ontario | No Occupation Listed | 251 |
| 8 | oliver | l | F | 20 | Methodist | Scottish | Ontario | No Occupation Listed | 251 |
| 5 | oliver | lucy | F | 48 | Methodist | English | England | No Occupation Listed | 251 |
| 4 | oliver | thomas | M | 49 | Methodist | Scottish | Ontario | Carpenters | 251 |
| 7 | oliver | william | M | 22 | Methodist | Scottish | Ontario | Labourers nfs | 251 |
| 7 | omare | charles | M | 19 | Roman Catholic | Irish | Ontario | Servants nfs | 49 |
| 8 | oneil | allice | F | 21 | Methodist | Irish | Ontario | No Occupation Listed | 117 |
| 6 | oneil | ann | F | 5 | Anglican | Irish | Ontario | No Occupation Listed | 117 |
| 23 | oneil | christiana | F | 16 | Presbyterian | Irish | Ontario | No Occupation Listed | 14 |
| 4 | oneil | elizabeth | F | 42 | Anglican | Irish | Ireland | No Occupation Listed | 117 |
| 3 | oneil | george | M | 45 | Methodist | Irish | Ontario | Farmers, general and nfs | 117 |
| 5 | oneil | hariet | F | 12 | Anglican | Irish | Ontario | No Occupation Listed | 117 |
| 1 | oneil | james | M | 9 | Presbyterian | Irish | Ontario | No Occupation Listed | 14 |
| 20 | oneil | john | M | 43 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 14 |
| 2 | oneil | john | M | 7 | Presbyterian | Irish | Ontario | No Occupation Listed | 14 |
| 15 | oneil | margaret | F | 55 | Methodist | Scottish | Ontario | No Occupation Listed | 13 |
| 16 | oneil | margaret | F | 24 | Methodist | Irish | Ontario | No Occupation Listed | 13 |
| 21 | oneil | margaret | F | 41 | Presbyterian | Scottish | Ontario | No Occupation Listed | 14 |
| 22 | oneil | margaret | F | 18 | Presbyterian | Irish | Ontario | No Occupation Listed | 14 |
| 24 | oneil | mary | F | 14 | Presbyterian | Irish | Ontario | No Occupation Listed | 14 |
| 25 | oneil | neil | M | 12 | Presbyterian | Irish | Ontario | No Occupation Listed | 14 |
| 14 | oneil | robert | M | 55 | Methodist | Irish | Ontario | Farmers, general and nfs | 13 |
| 17 | oneil | robert | M | 20 | Methodist | Irish | Ontario | No Occupation Listed | 13 |
| 4 | oneil | robert | M | 1 | Presbyterian | Irish | Ontario | No Occupation Listed | 14 |
| 18 | oneil | sarah | F | 18 | Methodist | Irish | Ontario | No Occupation Listed | 13 |
| 19 | oneil | william | M | 12 | Methodist | Irish | Ontario | No Occupation Listed | 13 |
| 3 | oneil | william | M | 4 | Presbyterian | Irish | Ontario | No Occupation Listed | 14 |
| 6 | osborn | adam | M | 50 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 141 |
| 16 | osborn | adam | M | 6 | Presbyterian | Scottish | Ontario | No Occupation Listed | 141 |
| 7 | osborn | agnes | F | 44 | Presbyterian | Scottish | Ontario | No Occupation Listed | 141 |
| 13 | osborn | alexander | M | 14 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 141 |
| 15 | osborn | alfred | M | 8 | Presbyterian | Scottish | Ontario | No Occupation Listed | 141 |
| 8 | osborn | c | F | 23 | Presbyterian | Scottish | Ontario | No Occupation Listed | 141 |
| 17 | osborn | c | F | 4 | Presbyterian | Scottish | Ontario | No Occupation Listed | 141 |
| 18 | osborn | catherine | F | 2 | Presbyterian | Scottish | Ontario | No Occupation Listed | 141 |
| 14 | osborn | james | M | 10 | Presbyterian | Scottish | Ontario | No Occupation Listed | 141 |
| 24 | osborn | jane | F | 8 | Presbyterian | Scottish | Ontario | No Occupation Listed | 157 |
| 17 | osborn | jennet | F | 47 | Presbyterian | Scottish | Ontario | No Occupation Listed | 157 |
| 21 | osborn | john | M | 14 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 157 |
| 16 | osborn | joseph | M | 48 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 157 |
| 10 | osborn | m | M | 19 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 141 |
| 19 | osborn | manfred | M | 0 | Presbyterian | Scottish | Ontario | No Occupation Listed | 141 |
| 20 | osborn | martha | F | 16 | Presbyterian | Scottish | Ontario | No Occupation Listed | 157 |
| 23 | osborn | mary | F | 10 | Presbyterian | Scottish | Ontario | No Occupation Listed | 157 |
| 11 | osborn | merion | F | 17 | Presbyterian | Scottish | Ontario | No Occupation Listed | 141 |
| 22 | osborn | nelson | M | 12 | Presbyterian | Scottish | Ontario | No Occupation Listed | 157 |
| 9 | osborn | peter | M | 21 | Presbyterian | Scottish | Ontario | No Occupation Listed | 141 |
| 18 | osborn | richard | M | 20 | Presbyterian | Scottish | Ontario | No Occupation Listed | 157 |
| 19 | osborn | robert | M | 18 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 157 |
| 12 | osborn | william | M | 16 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 141 |
| 1 | otenham | e | F | 13 | Anglican | English | Ontario | No Occupation Listed | 268 |
| 3 | otenham | e | F | 9 | Anglican | English | Ontario | No Occupation Listed | 268 |
| 7 | otenham | elizabeth | F | 68 | Anglican | English | England | No Occupation Listed | 269 |
| 2 | otenham | i | F | 11 | Anglican | English | Ontario | No Occupation Listed | 268 |
| 22 | otenham | james | M | 44 | Anglican | English | England | Farmers, general and nfs | 268 |
| 5 | otenham | james | M | 4 | Anglican | English | Ontario | No Occupation Listed | 268 |
| 6 | otenham | james | M | 72 | Anglican | English | England | Farmers, general and nfs | 269 |
| 4 | otenham | m | F | 6 | Anglican | English | Ontario | No Occupation Listed | 268 |
| 23 | otenham | margaret | F | 37 | Anglican | Scottish | Ontario | No Occupation Listed | 268 |
| 25 | otenham | robert | M | 15 | Anglican | English | Ontario | Farmers, general and nfs | 268 |
| 24 | otenham | william | M | 18 | Anglican | English | Ontario | Farmers, general and nfs | 268 |