Residents of Elderslie — Sub-district M, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 20 | ogg | david | M | 54 | Church of Scotland | Scottish | Scotland | Gardeners nfs | 207 |
| 22 | ogg | david | M | 15 | Church of Scotland | Scottish | Ontario | No Occupation Listed | 207 |
| 21 | ogg | james | M | 18 | Church of Scotland | Scottish | Ontario | No Occupation Listed | 207 |
| 2 | ogram | eliza | F | 26 | Methodist | Irish | Ontario | No Occupation Listed | 111 |
| 4 | ogram | jane | F | 21 | Methodist | Irish | Ontario | No Occupation Listed | 111 |
| 1 | ogram | john | M | 31 | Methodist | English | Ontario | Farmers, general and nfs | 111 |
| 3 | ogram | mary | F | 1 | Methodist | Irish | Ontario | No Occupation Listed | 111 |
| 10 | oldrieve | eliza | F | 21 | Anglican | English | Ontario | No Occupation Listed | 101 |
| 14 | oldrieve | frances | F | 2 | Anglican | English | Ontario | No Occupation Listed | 102 |
| 11 | oldrieve | george | M | 1 | Anglican | English | Ontario | No Occupation Listed | 101 |
| 15 | oldrieve | jane | F | 0 | Anglican | English | Ontario | No Occupation Listed | 102 |
| 13 | oldrieve | margaret | F | 31 | Anglican | English | Ontario | No Occupation Listed | 102 |
| 9 | oldrieve | richard | M | 29 | Anglican | English | England | Farmers, general and nfs | 101 |
| 12 | oldrieve | seth | M | 30 | Anglican | English | England | Joiners | 102 |
| 16 | orr | cathrine | F | 50 | Methodist | Irish | Ireland | No Occupation Listed | 223 |
| 15 | orr | james | M | 77 | Anglican | Irish | Ireland | Farmers, general and nfs | 215 |
| 17 | orr | james | M | 26 | Methodist | Irish | Ireland | No Occupation Listed | 223 |
| 17 | orr | john | M | 30 | Anglican | Irish | Ontario | No Occupation Listed | 215 |
| 19 | orr | john | M | 18 | Methodist | Irish | Ontario | No Occupation Listed | 223 |
| 18 | orr | margaret | F | 23 | Methodist | Irish | Ontario | No Occupation Listed | 223 |
| 16 | orr | mary | F | 62 | Anglican | Irish | Ireland | No Occupation Listed | 215 |
| 19 | orr | robert | M | 22 | Anglican | Irish | Ontario | No Occupation Listed | 215 |
| 8 | orr | thomas | M | 25 | Episcopal Methodist | Irish | Ontario | lawyer | 72 |
| 18 | orr | thomas | M | 26 | Anglican | Irish | Ontario | No Occupation Listed | 215 |
| 15 | orr | william | M | 44 | Methodist | Irish | Ireland | Farmers, general and nfs | 223 |
| 11 | oswald | christina | F | 63 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 156 |
| 13 | oswald | john | M | 20 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 156 |
| 12 | oswald | maggie | F | 25 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 156 |
| 15 | oswald | robert | M | 15 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 156 |
| 14 | oswald | william | M | 17 | Presbyterian | Scottish | Ontario | Farmers, general and nfs | 156 |