Residents of Walkerton, T-V — Sub-district I, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 11 | obrien | cecelia | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 470 |
| 9 | obrien | james | M | 23 | Roman Catholic | Irish | Ontario | Painters, nfs | 470 |
| 10 | obrien | martha | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 470 |
| 4 | obright | andrew | M | 8 | Roman Catholic | German | Ontario | No Occupation Listed | 403 |
| 23 | obright | anna | F | 17 | Roman Catholic | German | Ontario | No Occupation Listed | 403 |
| 17 | obright | anthony | M | 49 | Roman Catholic | German | Germany | Bookmakers (Sport) | 403 |
| 19 | obright | anthony | M | 22 | Roman Catholic | German | Ontario | Bricklayers | 403 |
| 22 | obright | appy | F | 17 | Roman Catholic | German | Ontario | No Occupation Listed | 403 |
| 3 | obright | caroline | F | 6 | Roman Catholic | German | Ontario | No Occupation Listed | 403 |
| 21 | obright | george | M | 19 | Roman Catholic | German | Ontario | Bricklayers | 403 |
| 1 | obright | henry | M | 12 | Roman Catholic | German | Ontario | No Occupation Listed | 403 |
| 24 | obright | joseph | M | 15 | Roman Catholic | German | Ontario | Ambiguous responses | 403 |
| 2 | obright | libzeta | F | 10 | Roman Catholic | German | Ontario | No Occupation Listed | 403 |
| 20 | obright | solonna | F | 20 | Roman Catholic | German | Ontario | Dressmakers | 403 |
| 25 | obright | theresa | F | 14 | Roman Catholic | German | Ontario | No Occupation Listed | 403 |
| 18 | obright | victoria | F | 47 | Roman Catholic | German | Germany | No Occupation Listed | 403 |
| 6 | obright | victoria | F | 2 | Roman Catholic | German | Ontario | No Occupation Listed | 403 |
| 5 | obright | william | M | 3 | Roman Catholic | German | Ontario | No Occupation Listed | 403 |
| 8 | oconnor | douglas | M | 2 | Anglican | Irish | Ontario | No Occupation Listed | 226 |
| 3 | oconnor | fred | M | 33 | Anglican | Irish | Ontario | barrister | 225 |
| 5 | oconnor | hamilton | M | 36 | Anglican | Irish | Ontario | barrister | 226 |
| 7 | oconnor | hamilton | M | 5 | Anglican | Irish | Ontario | No Occupation Listed | 226 |
| 6 | oconnor | jane | F | 24 | Anglican | Scottish | Ontario | No Occupation Listed | 226 |
| 4 | oconnor | maria | F | 23 | Anglican | Irish | Ontario | No Occupation Listed | 225 |
| 16 | odrowsky | anna | F | 4 | Roman Catholic | German | Ontario | No Occupation Listed | 421 |
| 14 | odrowsky | anthony | M | 34 | Roman Catholic | German | Germany | Weavers | 421 |
| 18 | odrowsky | elizabeth | F | 0 | Roman Catholic | German | Ontario | No Occupation Listed | 421 |
| 17 | odrowsky | mary | F | 2 | Roman Catholic | German | Ontario | No Occupation Listed | 421 |
| 19 | odrowsky | rosina | F | 74 | Roman Catholic | German | Germany | No Occupation Listed | 421 |
| 15 | odrowsky | veronica | F | 30 | Roman Catholic | German | Germany | No Occupation Listed | 421 |
| 9 | oharra | ada | F | 25 | Methodist | Irish | Ontario | Milliners | 29 |
| 10 | oharra | gertrude | F | 15 | Methodist | Irish | Ontario | No Occupation Listed | 29 |
| 8 | oharra | sophia | F | 49 | Methodist | Scottish | Ontario | No Occupation Listed | 29 |
| 7 | oharra | walter | M | 23 | Methodist | Irish | Ontario | Tinsmiths and Tinners and Tinkers | 29 |
| 12 | omalley | john | M | 25 | Roman Catholic | Irish | United States | Dealer, merchant etc. (Wholesale & retail trade) | 92 |
| 10 | openheiser | alfred | M | 3 | Baptist | American | Ontario | No Occupation Listed | 389 |
| 8 | openheiser | john | M | 31 | Baptist | German | Ontario | Carpenters | 389 |
| 9 | openheiser | rebecca | F | 29 | Baptist | American | United States | No Occupation Listed | 389 |