Residents of Chatham — Sub-district C, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 10 | obrien | albert | M | 13 | Presbyterian | Irish | Quebec | No Occupation Listed | 273 |
| 12 | obrien | anne | F | 8 | Presbyterian | Irish | Quebec | No Occupation Listed | 273 |
| 19 | obrien | christyanna | F | 32 | Presbyterian | Irish | Quebec | No Occupation Listed | 154 |
| 18 | obrien | edward | M | 35 | Presbyterian | Irish | Quebec | river drivers | 154 |
| 18 | obrien | emeline | F | 34 | Wesleyan Methodist | German | Ontario | No Occupation Listed | 143 |
| 17 | obrien | george | M | 36 | Presbyterian | Irish | Quebec | Farmers, general and nfs | 143 |
| 11 | obrien | george | M | 12 | Presbyterian | Irish | Quebec | No Occupation Listed | 273 |
| 14 | obrien | hannah | F | 8 | Presbyterian | Irish | Quebec | No Occupation Listed | 265 |
| 19 | obrien | hattie | F | 2 | Wesleyan Methodist | Irish | Quebec | No Occupation Listed | 143 |
| 8 | obrien | james | M | 48 | Presbyterian | Irish | Quebec | Farmers, general and nfs | 273 |
| 13 | obrien | james | M | 6 | Presbyterian | Irish | Quebec | No Occupation Listed | 273 |
| 14 | obrien | john | M | 1 | Presbyterian | Irish | Quebec | No Occupation Listed | 273 |
| 9 | obrien | kittie | F | 22 | Presbyterian | Irish | Quebec | No Occupation Listed | 273 |
| 20 | obrien | maria | F | 17 | Presbyterian | Irish | Quebec | No Occupation Listed | 154 |
| 15 | obrien | mary | F | 0 | Presbyterian | Irish | Quebec | No Occupation Listed | 273 |
| 22 | obrien | meriam | F | 12 | Presbyterian | Irish | Quebec | No Occupation Listed | 154 |
| 21 | obrien | robert | M | 16 | Presbyterian | Irish | Quebec | No Occupation Listed | 154 |
| 14 | oconner | john | M | 14 | Roman Catholic | Irish | Quebec | No Occupation Listed | 208 |
| 21 | oleneuve | henry | M | 29 | Roman Catholic | French | Quebec | Bookkeepers nfs | 14 |
| 22 | oleneuve | johanna | F | 28 | Roman Catholic | Irish | Quebec | No Occupation Listed | 14 |
| 23 | oleneuve | william | M | 2 | Roman Catholic | French | Quebec | No Occupation Listed | 14 |
| 12 | onesell | ancrelle | M | 5 | Roman Catholic | French | Quebec | No Occupation Listed | 203 |
| 10 | onesell | anne | F | 34 | Roman Catholic | French | Quebec | No Occupation Listed | 203 |
| 11 | onesell | joseph | M | 8 | Roman Catholic | French | Quebec | No Occupation Listed | 203 |
| 9 | onesell | robert | M | 31 | Roman Catholic | French | Quebec | Labourers nfs | 203 |
| 11 | onilette | agustin | M | 50 | Roman Catholic | French | Quebec | Farmers, general and nfs | 359 |
| 14 | onilette | agustin | M | 13 | Roman Catholic | French | Quebec | No Occupation Listed | 359 |
| 24 | onilette | alphonse | M | 8 | Roman Catholic | French | Quebec | No Occupation Listed | 530 |
| 1 | onilette | anxilda | F | 21 | Roman Catholic | French | Quebec | No Occupation Listed | 244 |
| 18 | onilette | baptiste | M | 44 | Roman Catholic | French | Quebec | Farmers, general and nfs | 530 |
| 25 | onilette | fidelia | F | 1 | Roman Catholic | French | Quebec | No Occupation Listed | 530 |
| 20 | onilette | flora | F | 18 | Roman Catholic | French | Quebec | No Occupation Listed | 530 |
| 21 | onilette | fred | M | 16 | Roman Catholic | French | Quebec | Farmers, general and nfs | 530 |
| 23 | onilette | joseph | M | 8 | Roman Catholic | French | Quebec | No Occupation Listed | 530 |
| 19 | onilette | margaret | F | 37 | Roman Catholic | French | Quebec | No Occupation Listed | 530 |
| 15 | onilette | matilda | F | 13 | Roman Catholic | French | Quebec | No Occupation Listed | 359 |
| 22 | onilette | nelson | M | 10 | Roman Catholic | French | Quebec | No Occupation Listed | 530 |
| 12 | onilette | rosile | F | 48 | Roman Catholic | French | Quebec | No Occupation Listed | 359 |
| 13 | onilette | rosile | F | 15 | Roman Catholic | French | Quebec | No Occupation Listed | 359 |
| 18 | oper | elizabeth | F | 0 | Roman Catholic | English | Quebec | No Occupation Listed | 159 |
| 14 | oper | mary | F | 22 | Roman Catholic | French | Quebec | No Occupation Listed | 159 |
| 17 | oper | mary | F | 3 | Roman Catholic | English | Quebec | No Occupation Listed | 159 |
| 13 | oper | richard | M | 40 | Anglican | English | England | Labourers nfs | 159 |
| 15 | oper | richard | M | 9 | Anglican | English | Quebec | No Occupation Listed | 159 |
| 16 | oper | william | M | 5 | Anglican | English | Quebec | No Occupation Listed | 159 |
| 3 | ostrom | doreas | F | 74 | Presbyterian | English | Nova Scotia | No Occupation Listed | 157 |
| 5 | ostrom | doreas | F | 42 | Presbyterian | German | Quebec | No Occupation Listed | 157 |
| 4 | ostrom | jane | F | 47 | Presbyterian | German | Quebec | No Occupation Listed | 157 |
| 2 | ostrom | john | M | 45 | Presbyterian | German | Quebec | Farmers, general and nfs | 157 |
| 13 | owens | charlotte | F | 87 | Anglican | English | England | No Occupation Listed | 543 |
| 16 | owens | denzald | F | 14 | Anglican | English | Quebec | No Occupation Listed | 118 |
| 13 | owens | george | M | 58 | Anglican | English | Quebec | Farmers, general and nfs | 118 |
| 15 | owens | john | M | 16 | Anglican | English | Quebec | No Occupation Listed | 543 |
| 14 | owens | margaret | F | 56 | Anglican | Scottish | Scotland | No Occupation Listed | 118 |
| 14 | owens | owen | M | 18 | Anglican | English | Quebec | Ships Masters and captains (Sea or Inland Waterways) | 543 |
| 12 | owens | thomas | M | 46 | Anglican | English | Quebec | Dealer, merchant etc. (Wholesale & retail trade) | 543 |
| 15 | owens | william | M | 16 | Anglican | English | Quebec | No Occupation Listed | 118 |
| 19 | owens | william | M | 41 | Anglican | English | Quebec | Dealer, merchant etc. (Wholesale & retail trade) | 544 |