Residents of Grattan — Sub-district E, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 8 | obra | virgina | F | 8 | Roman Catholic | French | Ontario | No Occupation Listed | 86 |
| 4 | obrien | john | M | 50 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 5 |
| 16 | obrien | maggie | F | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 293 |
| 5 | obrine | bridget | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 5 |
| 10 | obrine | bridget | F | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 5 |
| 2 | obrine | bridget | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 16 |
| 6 | obrine | bridget | F | 30 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 2 | obrine | bridget | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 134 |
| 4 | obrine | catherine | F | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 16 |
| 23 | obrine | charles | M | 78 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 19 |
| 13 | obrine | ellen | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 5 |
| 5 | obrine | hanora | F | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 16 |
| 25 | obrine | honorah | F | 36 | Roman Catholic | Irish | Ireland | No Occupation Listed | 16 |
| 5 | obrine | james | M | 31 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 131 |
| 8 | obrine | james | M | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 2 | obrine | james | M | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 223 |
| 8 | obrine | john | M | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 5 |
| 3 | obrine | john | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 16 |
| 24 | obrine | john | M | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 134 |
| 3 | obrine | john | M | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 223 |
| 5 | obrine | maggie | F | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 223 |
| 6 | obrine | margarette | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 16 |
| 11 | obrine | margret | F | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 5 |
| 1 | obrine | mary | F | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 16 |
| 24 | obrine | mary | F | 80 | Roman Catholic | Irish | Ireland | No Occupation Listed | 19 |
| 25 | obrine | mary | F | 57 | Roman Catholic | Irish | Ireland | No Occupation Listed | 134 |
| 1 | obrine | mary | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 134 |
| 1 | obrine | mary | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 223 |
| 7 | obrine | mary | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 223 |
| 12 | obrine | mathew | M | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 5 |
| 6 | obrine | michael | M | 23 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 5 |
| 6 | obrine | michael | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 223 |
| 4 | obrine | morrice | M | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 223 |
| 9 | obrine | patrick | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 5 |
| 12 | obrine | patrick | M | 26 | Roman Catholic | Irish | Ontario | Blacksmiths | 73 |
| 7 | obrine | patrick | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 131 |
| 3 | obrine | patrick | M | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 134 |
| 25 | obrine | patrick | M | 47 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 223 |
| 8 | obrine | patrick | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 223 |
| 7 | obrine | richard | M | 21 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 5 |
| 24 | obrine | richard | M | 52 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 16 |
| 7 | obrine | richard | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 16 |
| 11 | oconnor | annie | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 17 |
| 22 | odonnell | julia | F | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 257 |
| 20 | odonnell | margaret | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 257 |
| 19 | odonnell | mary | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 257 |
| 18 | odonnell | peter | M | 17 | Roman Catholic | Irish | Quebec | No Occupation Listed | 257 |
| 17 | odonnell | william | M | 45 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 257 |
| 21 | odonnell | william | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 257 |
| 21 | ogorman | charles | M | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 18 |
| 13 | ogorman | ellen | F | 54 | Roman Catholic | Irish | Ireland | No Occupation Listed | 18 |
| 14 | ogorman | ellen | F | 28 | Roman Catholic | Irish | Ontario | No Occupation Listed | 18 |
| 19 | ogorman | george | M | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 18 |
| 3 | ogorman | james | M | 34 | Roman Catholic | Irish | Ireland | Coach, carriage, cart and wagon makers | 255 |
| 12 | ogorman | john | M | 58 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 18 |
| 16 | ogorman | john | M | 24 | Roman Catholic | Irish | Ontario | No Occupation Listed | 18 |
| 22 | ogorman | joseph | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 18 |
| 15 | ogorman | mary | F | 26 | Roman Catholic | Irish | Ontario | No Occupation Listed | 18 |
| 4 | ogorman | mary | F | 31 | Roman Catholic | Irish | Ontario | No Occupation Listed | 255 |
| 18 | ogorman | russel | M | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 18 |
| 6 | ogorman | thomas | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 255 |
| 20 | ogorman | tomas | M | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 18 |
| 17 | ogorman | william | M | 23 | Roman Catholic | Irish | Ontario | No Occupation Listed | 18 |
| 9 | olra | alfred | M | 6 | Roman Catholic | French | Ontario | No Occupation Listed | 86 |
| 7 | olra | july | F | 30 | Roman Catholic | French | Quebec | No Occupation Listed | 86 |
| 6 | olra | lisadore | M | 40 | Roman Catholic | French | Ontario | Farmers, general and nfs | 86 |
| 11 | olra | lisadore | M | 2 | Roman Catholic | French | Ontario | No Occupation Listed | 86 |
| 12 | olra | louis | M | 0 | Roman Catholic | French | Ontario | No Occupation Listed | 86 |
| 10 | olra | oliver | M | 4 | Roman Catholic | French | Ontario | No Occupation Listed | 86 |
| 14 | oneil | catherine | F | 61 | Roman Catholic | Irish | Ireland | No Occupation Listed | 285 |
| 15 | oneil | constantine | M | 30 | Roman Catholic | Irish | Quebec | No Occupation Listed | 285 |
| 16 | oneil | elizabeth | F | 31 | Roman Catholic | Irish | Quebec | No Occupation Listed | 285 |
| 19 | oneil | james | M | 20 | Roman Catholic | Irish | Ontario | Clerk, nfs | 285 |
| 17 | oneil | john | M | 25 | Roman Catholic | Irish | Ontario | No Occupation Listed | 285 |
| 18 | oneil | josephine | F | 24 | Roman Catholic | Irish | Ontario | No Occupation Listed | 285 |
| 16 | oreiley | barnard | M | 80 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 128 |
| 5 | oreiley | john | M | 40 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 121 |
| 6 | oreiley | jubya | F | 35 | Roman Catholic | Irish | Ontario | No Occupation Listed | 121 |
| 17 | oreiley | mary | F | 74 | Roman Catholic | Scottish | Ireland | No Occupation Listed | 128 |
| 7 | oreiley | thomas | M | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 121 |
| 1 | osburne | james | M | 33 | Anglican | Irish | Ontario | Farmers, general and nfs | 197 |
| 12 | owen | abraham | M | 10 | Anglican | Irish | Ontario | No Occupation Listed | 142 |
| 10 | owen | eliza | F | 15 | Anglican | Irish | Ontario | No Occupation Listed | 142 |
| 13 | owen | john | M | 7 | Anglican | Irish | Ontario | No Occupation Listed | 142 |
| 5 | owen | joseph | M | 52 | Anglican | Irish | Ireland | Farmers, general and nfs | 142 |
| 11 | owen | joseph | M | 13 | Anglican | Irish | Ontario | No Occupation Listed | 142 |
| 7 | owen | richard | M | 21 | Anglican | Irish | Ontario | No Occupation Listed | 142 |
| 6 | owen | sarah | F | 46 | Anglican | Irish | Ontario | No Occupation Listed | 142 |
| 9 | owen | sarah | F | 17 | Anglican | Irish | Ontario | No Occupation Listed | 142 |
| 8 | owen | william | M | 19 | Anglican | Irish | Ontario | No Occupation Listed | 142 |
| 1 | owens | albert | M | 2 | Anglican | Irish | Ontario | No Occupation Listed | 156 |
| 21 | owens | edward | M | 24 | Anglican | Irish | Ontario | Farmers, general and nfs | 156 |
| 25 | owens | elizabeth | F | 13 | Anglican | Irish | Ontario | No Occupation Listed | 137 |
| 22 | owens | mary | F | 30 | Anglican | Scottish | Ontario | No Occupation Listed | 156 |