Residents of Tyendinaga — Sub-district B, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 13 | oakly | esther | F | 50 | Episcopal Methodist | German | Ontario | No Occupation Listed | 45 |
| 15 | oakly | matatia | F | 16 | Episcopal Methodist | German | Ontario | No Occupation Listed | 45 |
| 14 | oakly | nelson | M | 20 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 45 |
| 1 | ocarroll | ann | F | 72 | Roman Catholic | Irish | Ireland | No Occupation Listed | 64 |
| 25 | ocarroll | peter | M | 35 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 64 |
| 21 | oconnor | bartholomew | M | 30 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 84 |
| 18 | oconnor | bridget | F | 28 | Roman Catholic | Irish | Ontario | No Occupation Listed | 84 |
| 17 | oconnor | dennis | M | 33 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 84 |
| 20 | oconnor | george | M | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 84 |
| 19 | oconnor | thomas | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 84 |
| 3 | ohara | ellen | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 219 |
| 24 | ohara | james | M | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 219 |
| 22 | ohara | johanna | F | 31 | Roman Catholic | Irish | Ontario | No Occupation Listed | 219 |
| 23 | ohara | john | M | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 219 |
| 1 | ohara | margaret | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 219 |
| 25 | ohara | mary | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 219 |
| 21 | ohara | thomas | M | 30 | Roman Catholic | Irish | Ontario | Labourers nfs | 219 |
| 2 | ohara | william | M | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 219 |
| 25 | ohare | hanorah | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 57 |
| 1 | ohare | joseph | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 57 |
| 23 | ohare | mary | F | 25 | Roman Catholic | Irish | Ontario | No Occupation Listed | 57 |
| 2 | ohare | mary | F | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 57 |
| 24 | ohare | patrick | M | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 57 |
| 22 | oleary | cathrine | F | 23 | Roman Catholic | Irish | Ontario | No Occupation Listed | 171 |
| 4 | oleary | cathrine | F | 22 | Roman Catholic | Irish | Ontario | No Occupation Listed | 233 |
| 3 | oleary | dennis | M | 28 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 233 |
| 21 | oleary | elizabeth | F | 55 | Roman Catholic | Irish | Ireland | No Occupation Listed | 171 |
| 25 | oleary | elizabeth | F | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 171 |
| 2 | oleary | ellen | F | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 171 |
| 2 | oleary | ellen | F | 50 | Roman Catholic | Irish | Ireland | No Occupation Listed | 233 |
| 6 | oleary | ellen | F | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 233 |
| 23 | oleary | james | M | 23 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 171 |
| 20 | oleary | john | M | 74 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 171 |
| 7 | oleary | john | M | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 233 |
| 3 | oleary | mary | F | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 171 |
| 5 | oleary | mary | F | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 233 |
| 1 | oleary | michael | M | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 171 |
| 24 | oleary | oatrick | M | 20 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 171 |
| 13 | oleary | timothy | M | 80 | Roman Catholic | Irish | Ireland | No Occupation Listed | 340 |
| 13 | oliver | christopher | M | 63 | Episcopal Methodist | German | Ontario | Farmers, general and nfs | 144 |
| 10 | oneill | james | M | 20 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 120 |
| 9 | oneill | mary | F | 41 | Roman Catholic | Irish | Ireland | No Occupation Listed | 120 |
| 8 | onneill | john | M | 50 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 120 |
| 16 | orea | james | M | 70 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 116 |
| 17 | orea | jane | F | 67 | Roman Catholic | Irish | Ireland | No Occupation Listed | 116 |
| 15 | orea | mary | F | 22 | Roman Catholic | Irish | Ontario | No Occupation Listed | 116 |
| 14 | orea | patrick | M | 25 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 116 |
| 18 | oriely | bridget | F | 55 | Roman Catholic | Irish | Ireland | No Occupation Listed | 195 |
| 21 | oriely | edward | M | 23 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 195 |
| 19 | oriely | peder | M | 28 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 195 |
| 20 | oriely | philip | M | 25 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 195 |
| 11 | orr | john | M | 29 | Anglican | Irish | Ontario | No Occupation Listed | 65 |
| 10 | orr | margaret | F | 50 | Anglican | Irish | Ireland | No Occupation Listed | 65 |
| 13 | orr | mary | F | 21 | Anglican | Irish | Ontario | No Occupation Listed | 65 |
| 9 | orr | robert | M | 56 | Anglican | Irish | Ireland | Farmers, general and nfs | 65 |
| 14 | orr | robert | M | 12 | Anglican | Irish | Ontario | No Occupation Listed | 65 |
| 12 | orr | sarah | F | 24 | Anglican | Irish | Ontario | No Occupation Listed | 65 |
| 14 | osborn | abigail | F | 68 | Episcopal Methodist | English | Ontario | No Occupation Listed | 154 |
| 9 | osborn | alma | F | 14 | Episcopal Methodist | English | Ontario | No Occupation Listed | 153 |
| 22 | osborn | alvin | M | 17 | Anglican | English | England | Servants nfs | 16 |
| 11 | osborn | arther | M | 6 | Episcopal Methodist | English | Ontario | No Occupation Listed | 153 |
| 12 | osborn | benjamin | M | 27 | Episcopal Methodist | English | Ontario | Farmers, general and nfs | 77 |
| 10 | osborn | charles | M | 12 | Episcopal Methodist | English | Ontario | No Occupation Listed | 153 |
| 6 | osborn | clawrence | M | 18 | Methodist | German | Ontario | Farmers, general and nfs | 239 |
| 13 | osborn | easter | F | 28 | Episcopal Methodist | English | Ontario | No Occupation Listed | 77 |
| 4 | osborn | finley | M | 44 | Methodist | English | Ontario | Farmers, general and nfs | 239 |
| 7 | osborn | francis | M | 15 | Methodist | German | Ontario | No Occupation Listed | 239 |
| 8 | osborn | frederick | M | 11 | Methodist | German | Ontario | No Occupation Listed | 239 |
| 2 | osborn | gilbert | M | 25 | Methodist | English | Ontario | Farmers, general and nfs | 122 |
| 7 | osborn | jane | F | 39 | Episcopal Methodist | English | Ontario | No Occupation Listed | 153 |
| 12 | osborn | keathy | F | 4 | Episcopal Methodist | English | Ontario | No Occupation Listed | 153 |
| 3 | osborn | lydia | F | 40 | Methodist | English | Ontario | No Occupation Listed | 122 |
| 5 | osborn | mariah | F | 24 | Methodist | German | Ontario | Farmers, general and nfs | 239 |
| 13 | osborn | mary | F | 2 | Episcopal Methodist | English | Ontario | No Occupation Listed | 153 |
| 15 | osborn | samantha | F | 36 | Episcopal Methodist | English | Ontario | No Occupation Listed | 154 |
| 6 | osborn | samuel | M | 40 | Episcopal Methodist | English | Ontario | Farmers, general and nfs | 153 |
| 14 | osborn | wilbert | M | 0 | Episcopal Methodist | English | Ontario | No Occupation Listed | 77 |
| 11 | osborn | william | M | 33 | Episcopal Methodist | English | Ontario | Farmers, general and nfs | 77 |
| 8 | osborn | william | M | 16 | Episcopal Methodist | English | Ontario | No Occupation Listed | 153 |
| 20 | osborne | cathrine | F | 52 | Roman Catholic | Irish | Ireland | No Occupation Listed | 181 |
| 2 | osborne | charles | M | 25 | Methodist | English | Ontario | Dealer, merchant etc. (Wholesale & retail trade) | 307 |
| 5 | osborne | elizabeth | F | 62 | Episcopal Methodist | English | Ontario | No Occupation Listed | 174 |
| 3 | osborne | emma | F | 27 | Methodist | English | Ontario | Teachers (unspecified) | 307 |
| 25 | osborne | frederick | M | 57 | Methodist | English | England | Millers and related workers | 307 |
| 19 | osborne | richard | M | 59 | Roman Catholic | German | Ontario | Farmers, general and nfs | 181 |
| 3 | osborne | robert | M | 42 | Episcopal Methodist | English | Ontario | Saddler and harness maker | 174 |
| 1 | osborne | sarah | F | 41 | Methodist | English | Ontario | No Occupation Listed | 307 |
| 4 | osborne | thomas | M | 24 | Episcopal Methodist | English | Ontario | No Occupation Listed | 174 |
| 18 | osborne | thomas | M | 18 | Methodist | Blank | Ontario | river drivers | 252 |
| 20 | osborne | william | M | 17 | Anglican | English | Ontario | river drivers | 315 |
| 5 | osullivan | agnes | F | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 159 |
| 7 | osullivan | ann | F | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 35 |
| 8 | osullivan | ann | F | 37 | Roman Catholic | Irish | Ireland | No Occupation Listed | 90 |
| 9 | osullivan | ann | F | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 11 | osullivan | catherine | F | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 25 | osullivan | cathrine | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 159 |
| 8 | osullivan | cathrine | F | 75 | Roman Catholic | Irish | Ireland | No Occupation Listed | 159 |
| 4 | osullivan | ellen | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 159 |
| 8 | osullivan | james | M | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 35 |
| 7 | osullivan | james | M | 44 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 90 |
| 10 | osullivan | james | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 1 | osullivan | james | M | 19 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 159 |
| 6 | osullivan | johannah | F | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 35 |
| 12 | osullivan | john | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 22 | osullivan | john | M | 50 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 159 |
| 3 | osullivan | john | M | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 159 |
| 23 | osullivan | margaret | F | 44 | Roman Catholic | Irish | Ireland | No Occupation Listed | 159 |
| 2 | osullivan | margaret | F | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 159 |
| 9 | osullivan | marthy | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 35 |
| 4 | osullivan | mary | F | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 24 | osullivan | mary | F | 22 | Roman Catholic | Irish | Ontario | No Occupation Listed | 159 |
| 6 | osullivan | peter | M | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 159 |
| 7 | osullivan | thomas | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 159 |
| 5 | osullivan | william | M | 34 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 35 |
| 13 | osullivan | william | M | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 90 |
| 13 | otis | john | M | 15 | Anglican | Irish | Ireland | No Occupation Listed | 29 |
| 12 | otis | margaret | F | 80 | Anglican | Irish | Ireland | No Occupation Listed | 29 |