Residents of Port Colborne, Village — Sub-district B, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 17 | oconnors | james | M | 18 | Roman Catholic | Irish | Ontario | Clerk, nfs | 87 |
| 14 | oconnors | john | M | 48 | Roman Catholic | Irish | Ireland | Policemen and detectives, employer unknown | 87 |
| 16 | oconnors | margaret | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 87 |
| 23 | oconnors | margaret | F | 80 | Roman Catholic | Irish | Ireland | No Occupation Listed | 198 |
| 19 | oconnors | martin | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 87 |
| 15 | oconnors | mary | F | 47 | Roman Catholic | Irish | Ireland | No Occupation Listed | 87 |
| 18 | oconnors | thomas | M | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 87 |
| 20 | oconnors | william | M | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 87 |
| 12 | oharen | bridget | F | 20 | Roman Catholic | Irish | Ireland | Seamstress | 117 |
| 15 | oharen | charles | M | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 117 |
| 19 | oharen | elizabeth | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 117 |
| 10 | oharen | emma | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 117 |
| 18 | oharen | emma | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 117 |
| 16 | oharen | francis | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 117 |
| 9 | oharen | james | M | 46 | Roman Catholic | Irish | Ireland | Labourers nfs | 117 |
| 13 | oharen | james | M | 18 | Roman Catholic | Irish | Ireland | Labourers nfs | 117 |
| 11 | oharen | john | M | 21 | Roman Catholic | Irish | Ireland | Stationary firemen and firemen nfs | 117 |
| 14 | oharen | mary | F | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 117 |
| 17 | oharen | william | M | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 117 |
| 20 | olouff | delimae | F | 25 | Roman Catholic | French | Quebec | No Occupation Listed | 34 |
| 22 | olouff | gedeas | M | 0 | Roman Catholic | French | Quebec | No Occupation Listed | 34 |
| 19 | olouff | louie | M | 28 | Roman Catholic | French | Quebec | Labourers nfs | 34 |
| 21 | olouff | louie | M | 3 | Roman Catholic | French | Quebec | No Occupation Listed | 34 |
| 16 | oneill | alice | F | 12 | Anglican | Irish | Ontario | No Occupation Listed | 300 |
| 17 | oneill | edward | M | 10 | Anglican | Irish | Ontario | No Occupation Listed | 300 |
| 20 | oneill | emma | F | 4 | Anglican | Irish | Ontario | No Occupation Listed | 300 |
| 18 | oneill | flora | F | 8 | Anglican | Irish | Ontario | No Occupation Listed | 300 |
| 19 | oneill | ida | F | 6 | Anglican | Irish | Ontario | No Occupation Listed | 300 |
| 14 | oneill | mary | F | 39 | Anglican | Irish | Ontario | No Occupation Listed | 300 |
| 15 | oneill | minnie | F | 14 | Anglican | Irish | Ontario | No Occupation Listed | 300 |
| 13 | oneill | thomas | M | 43 | Anglican | Irish | Ireland | Boot and shoemakers and repairers | 300 |
| 21 | oneill | thomas | M | 1 | Anglican | Irish | Ontario | No Occupation Listed | 300 |
| 20 | oram | candase | F | 16 | Anglican | German | Ontario | No Occupation Listed | 207 |
| 18 | oram | james | M | 35 | Anglican | German | Ontario | Labourers nfs | 207 |
| 19 | oram | mary | F | 35 | Anglican | German | Ontario | No Occupation Listed | 207 |