Residents of Port Perry, VL — Sub-district I, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 18 | obrien | mary | F | 18 | Episcopal Methodist | Irish | Ontario | Tailors and tailoresses | 175 |
| 11 | oliver | charles | M | 35 | Episcopal Methodist | German | Ontario | Labourers nfs | 115 |
| 13 | oliver | james | M | 6 | Episcopal Methodist | German | Ontario | No Occupation Listed | 115 |
| 14 | oliver | jessie | F | 1 | Episcopal Methodist | German | Ontario | No Occupation Listed | 115 |
| 12 | oliver | salvina | F | 31 | Episcopal Methodist | English | Ontario | No Occupation Listed | 115 |
| 17 | orser | christina | F | 74 | United Methodist/Bible Christian | German | Ontario | No Occupation Listed | 105 |
| 21 | owens | annie | F | 30 | Methodist | English | Ontario | No Occupation Listed | 346 |
| 23 | owens | leslie | M | 2 | Methodist | English | Ontario | No Occupation Listed | 346 |
| 22 | owens | perey | M | 4 | Methodist | English | Ontario | No Occupation Listed | 346 |
| 20 | owens | wesley | M | 30 | Methodist | English | Ontario | Blacksmiths | 346 |