Residents of London, Ward—Quartier No. 6 — Sub-district F, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 6 | oak | annie | F | 2 | Methodist | English | Canada | No Occupation Listed | 196 |
| 5 | oak | ethel | F | 4 | Methodist | English | Canada | No Occupation Listed | 196 |
| 2 | oak | henry | M | 30 | Methodist | English | Canada | Carpenters | 196 |
| 4 | oak | jane | F | 7 | Methodist | English | Canada | No Occupation Listed | 196 |
| 3 | oak | sarah | F | 29 | Methodist | English | Canada | No Occupation Listed | 196 |
| 7 | oak | william | M | 0 | Methodist | English | Canada | No Occupation Listed | 196 |
| 4 | obrien | ellen | F | 20 | Roman Catholic | Irish | Ireland | Servants nfs | 221 |
| 16 | obrien | mary | F | 21 | Roman Catholic | English | Ontario | Servants nfs | 346 |
| 16 | oconnor | mary | F | 22 | Roman Catholic | Irish | United States | Members of religious orders | 464 |
| 24 | odonohue | annie | F | 6 | Roman Catholic | Irish | Canada | No Occupation Listed | 65 |
| 19 | odonohue | catherine | F | 20 | Roman Catholic | Irish | Canada | No Occupation Listed | 65 |
| 18 | odonohue | ellen | F | 45 | Roman Catholic | Irish | Ireland | No Occupation Listed | 65 |
| 22 | odonohue | ellen | F | 15 | Roman Catholic | Irish | Canada | Dressmakers | 65 |
| 20 | odonohue | hattie | F | 18 | Roman Catholic | Irish | Canada | No Occupation Listed | 65 |
| 23 | odonohue | ida | F | 10 | Roman Catholic | Irish | Canada | No Occupation Listed | 65 |
| 17 | odonohue | john | M | 50 | Roman Catholic | Irish | Ireland | Commercial travellers | 65 |
| 21 | odonohue | mary | F | 16 | Roman Catholic | Irish | Canada | No Occupation Listed | 65 |
| 21 | omara | alice | F | 4 | Roman Catholic | Irish | United States | No Occupation Listed | 238 |
| 16 | omara | bridget | F | 36 | Roman Catholic | Irish | Ireland | No Occupation Listed | 238 |
| 17 | omara | frank | M | 14 | Roman Catholic | Irish | United States | No Occupation Listed | 238 |
| 15 | omara | hugh | M | 49 | Roman Catholic | Irish | Ireland | Gardeners nfs | 238 |
| 20 | omara | hugh | M | 7 | Roman Catholic | Irish | United States | No Occupation Listed | 238 |
| 22 | omara | john | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 238 |
| 19 | omara | kate | F | 9 | Roman Catholic | Irish | United States | No Occupation Listed | 238 |
| 18 | omara | mary | F | 11 | Roman Catholic | Irish | United States | No Occupation Listed | 238 |
| 6 | oreilly | john | M | 18 | Roman Catholic | English | Ontario | Carpenters | 269 |
| 4 | oreilly | maggie | F | 20 | Roman Catholic | English | Ontario | Servants nfs | 269 |
| 3 | oreilly | margarett | F | 50 | Roman Catholic | Irish | Ireland | No Occupation Listed | 269 |
| 5 | oreilly | patrick | M | 25 | Roman Catholic | English | Ontario | Dealer, merchant etc. (Wholesale & retail trade) | 269 |
| 13 | owen | cora | F | 22 | Anglican | English | Ontario | No Occupation Listed | 55 |
| 14 | owen | frank | M | 14 | Anglican | English | Ontario | No Occupation Listed | 55 |
| 9 | owen | hamlet | M | 29 | Anglican | English | Ontario | Engineers (US) nfs | 55 |
| 10 | owen | henry | M | 24 | Anglican | English | Ontario | Dealer, merchant etc. (Wholesale & retail trade) | 55 |
| 15 | owen | ida | F | 12 | Anglican | English | Ontario | No Occupation Listed | 55 |
| 12 | owen | loue | F | 24 | Anglican | English | Ontario | No Occupation Listed | 55 |
| 8 | owen | maryann | F | 50 | Anglican | English | Jersey | No Occupation Listed | 55 |
| 7 | owen | wade | M | 64 | Anglican | English | United States | Construction workers nec | 55 |
| 11 | owen | wade | M | 21 | Anglican | English | Ontario | Clerk, nfs | 55 |
| 16 | owens | edward | M | 20 | Anglican | Irish | Ireland | No Occupation Listed | 125 |
| 13 | owens | elizabeth | F | 28 | Anglican | Irish | Scotland | No Occupation Listed | 125 |
| 15 | owens | john | M | 22 | Anglican | Irish | England | No Occupation Listed | 125 |
| 12 | owens | mary | F | 55 | Anglican | Irish | Ireland | No Occupation Listed | 125 |
| 14 | owens | wilson | M | 24 | Anglican | Irish | Ireland | Bookkeepers nfs | 125 |