Residents of Essa — Sub-district F, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 22 | ormsby | george | M | 22 | Presbyterian | Irish | United States | Plasterers | 131 |
| 24 | orr | eliza | F | 1 | Presbyterian | Irish | Ontario | No Occupation Listed | 299 |
| 20 | orr | jane | F | 32 | Presbyterian | Irish | Ireland | No Occupation Listed | 299 |
| 21 | orr | john | M | 15 | Presbyterian | Irish | Ireland | Labourers nfs | 299 |
| 23 | orr | marey | F | 6 | Presbyterian | Irish | Ireland | No Occupation Listed | 299 |
| 22 | orr | robert | M | 12 | Presbyterian | Irish | Ireland | No Occupation Listed | 299 |
| 19 | orr | william | M | 35 | Presbyterian | Irish | Ireland | Labourers nfs | 299 |
| 13 | orser | hamilton | M | 20 | Presbyterian | German | Ontario | No Occupation Listed | 477 |
| 11 | orser | john | M | 62 | Presbyterian | German | Ontario | Farmers, general and nfs | 477 |
| 14 | orser | john | M | 26 | Presbyterian | German | Ontario | Farmers, general and nfs | 477 |
| 12 | orser | rhode | F | 16 | Presbyterian | German | Ontario | No Occupation Listed | 477 |
| 14 | orton | alvin | M | 28 | Methodist | English | Ontario | Teachers (unspecified) | 293 |
| 15 | orton | ellen | F | 23 | Methodist | English | Ontario | No Occupation Listed | 293 |
| 16 | orton | ettie | F | 3 | Methodist | English | Ontario | No Occupation Listed | 293 |
| 9 | osier | arness | M | 15 | Roman Catholic | French | Quebec | Labourers nfs | 395 |
| 12 | osier | ellen | F | 2 | Roman Catholic | French | Ontario | No Occupation Listed | 395 |
| 8 | osier | exilda | F | 17 | Roman Catholic | French | Quebec | No Occupation Listed | 395 |
| 6 | osier | joseph | M | 39 | Roman Catholic | French | Quebec | Labourers nfs | 395 |
| 7 | osier | mary | F | 38 | Roman Catholic | French | Quebec | No Occupation Listed | 395 |
| 11 | osier | mary | F | 7 | Roman Catholic | French | Ontario | No Occupation Listed | 395 |
| 10 | osier | tuff | M | 11 | Roman Catholic | French | Ontario | No Occupation Listed | 395 |