Residents of Ottawa, Victoria Ward—Quartier — Sub-district B, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 10 | oboyle | anne | F | 39 | Roman Catholic | Irish | Newfoundland | No Occupation Listed | 99 |
| 11 | oboyle | grace | F | 16 | Roman Catholic | Irish | Ontario | Governess | 99 |
| 25 | obrien | hannah | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 293 |
| 24 | obrien | william | M | 28 | Roman Catholic | Irish | Quebec | Pipe fitters | 293 |
| 1 | obrien | william | M | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 293 |
| 23 | oconnor | albert | M | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 76 |
| 19 | oconnor | elisabeth | F | 34 | Roman Catholic | Irish | Ontario | No Occupation Listed | 76 |
| 21 | oconnor | george | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 76 |
| 18 | oconnor | john | M | 35 | Roman Catholic | Irish | Ireland | Labourers nfs | 76 |
| 22 | oconnor | john | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 76 |
| 20 | oconnor | luke | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 76 |
| 23 | oconor | alice | F | 52 | Anglican | Irish | Ontario | No Occupation Listed | 134 |
| 22 | oconor | roderick | M | 29 | Anglican | Irish | Ontario | Hotel Keepers and Managers | 134 |
| 22 | odanger | andreau | F | 28 | Roman Catholic | French | Ontario | No Occupation Listed | 238 |
| 12 | ogradey | mary | F | 34 | Roman Catholic | Irish | Ontario | Servants nfs | 51 |
| 11 | ogradey | mary | F | 22 | Roman Catholic | Irish | Ontario | Servants nfs | 61 |
| 15 | ohara | john | M | 28 | Roman Catholic | Irish | Ireland | Labourers nfs | 111 |
| 12 | ohare | eva | F | 11 | Anglican | Irish | Ontario | No Occupation Listed | 89 |
| 10 | oliver | albert | M | 11 | Methodist | English | Ontario | No Occupation Listed | 261 |
| 23 | oliver | alexander | M | 6 | Presbyterian | Irish | Ontario | No Occupation Listed | 110 |
| 17 | oliver | andrew | M | 19 | Presbyterian | Irish | Ontario | Millwrights | 110 |
| 24 | oliver | annie | F | 4 | Presbyterian | Irish | Ontario | No Occupation Listed | 110 |
| 4 | oliver | antwinette | F | 2 | Roman Catholic | French | Ontario | No Occupation Listed | 207 |
| 2 | oliver | cabina | F | 6 | Roman Catholic | French | Ontario | No Occupation Listed | 207 |
| 25 | oliver | camille | M | 36 | Roman Catholic | French | Quebec | Foremen and supervisors nfs | 207 |
| 21 | oliver | charles | M | 11 | Presbyterian | Irish | Ontario | No Occupation Listed | 110 |
| 18 | oliver | christina | F | 17 | Presbyterian | Irish | Ontario | No Occupation Listed | 110 |
| 22 | oliver | ernest | M | 8 | Presbyterian | Irish | Ontario | No Occupation Listed | 110 |
| 11 | oliver | fanny | F | 8 | Methodist | English | Ontario | No Occupation Listed | 261 |
| 16 | oliver | fredrick | M | 2 | Roman Catholic | French | Ontario | No Occupation Listed | 174 |
| 13 | oliver | george | M | 45 | Roman Catholic | French | Quebec | Millwrights | 174 |
| 15 | oliver | george | M | 7 | Roman Catholic | French | Ontario | No Occupation Listed | 174 |
| 9 | oliver | henrietta | F | 13 | Methodist | English | Ontario | No Occupation Listed | 261 |
| 2 | oliver | herbert | M | 5 | Methodist | English | Ontario | No Occupation Listed | 265 |
| 24 | oliver | james | M | 32 | Methodist | English | — | Cabinet makers | 265 |
| 5 | oliver | jane | F | 46 | Methodist | Irish | Quebec | No Occupation Listed | 261 |
| 6 | oliver | jeannie | F | 23 | Methodist | English | Quebec | No Occupation Listed | 261 |
| 25 | oliver | john | M | 2 | Presbyterian | Irish | Ontario | No Occupation Listed | 110 |
| 4 | oliver | john | M | 56 | Methodist | English | England | No Occupation Listed | 261 |
| 7 | oliver | john | M | 19 | Methodist | English | Ontario | No Occupation Listed | 261 |
| 14 | oliver | letita | F | 30 | Roman Catholic | Scottish | Quebec | No Occupation Listed | 174 |
| 5 | oliver | louis | M | 0 | Roman Catholic | French | Ontario | No Occupation Listed | 207 |
| 3 | oliver | mary | F | 4 | Roman Catholic | French | Ontario | No Occupation Listed | 207 |
| 16 | oliver | mary | F | 39 | Presbyterian | Scottish | Ontario | No Occupation Listed | 110 |
| 19 | oliver | robert | M | 15 | Presbyterian | Irish | Quebec | Clerk, nfs | 110 |
| 8 | oliver | sarah | F | 18 | Methodist | English | Ontario | No Occupation Listed | 261 |
| 25 | oliver | sarah | F | 27 | Apostolic | English | Ontario | No Occupation Listed | 265 |
| 1 | oliver | virgina | F | 32 | Roman Catholic | French | Quebec | No Occupation Listed | 207 |
| 15 | oliver | william | M | 44 | Plymouth Brethren | Irish | Ontario | Millwrights | 110 |
| 20 | oliver | william | M | 13 | Presbyterian | Irish | Ontario | No Occupation Listed | 110 |
| 1 | oliver | william | M | 8 | Methodist | English | Ontario | No Occupation Listed | 265 |
| 5 | omallay | annie | F | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 135 |
| 6 | omallay | james | M | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 135 |
| 1 | omallay | john | M | 33 | Roman Catholic | Irish | Ontario | Boot and shoemakers and repairers | 135 |
| 4 | omallay | mary | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 135 |
| 2 | omallay | valirea | F | 32 | Roman Catholic | French | Ontario | No Occupation Listed | 135 |
| 3 | omallay | valirea | F | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 135 |
| 20 | omare | alexina | F | 11 | Roman Catholic | French | Quebec | No Occupation Listed | 205 |
| 16 | omare | alord | M | 57 | Roman Catholic | French | Quebec | Labourers nfs | 205 |
| 19 | omare | delore | M | 12 | Roman Catholic | French | Quebec | No Occupation Listed | 205 |
| 17 | omare | emeline | F | 49 | Roman Catholic | French | Quebec | No Occupation Listed | 205 |
| 18 | omare | george | M | 15 | Roman Catholic | French | Quebec | No Occupation Listed | 205 |
| 12 | omearan | margaret | F | 37 | Roman Catholic | Irish | Ontario | No Occupation Listed | 3 |
| 15 | omearan | margaret | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 3 |
| 11 | omearan | michael | M | 40 | Roman Catholic | Irish | Ontario | Blacksmiths | 3 |
| 14 | omearan | patrick | M | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 3 |
| 13 | omearan | phebe | F | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 3 |
| 10 | omera | charlote | F | 45 | Anglican | English | England | No Occupation Listed | 89 |
| 9 | omera | herbert | M | 45 | Roman Catholic | Irish | Quebec | Government functionaries (nfs) | 89 |
| 17 | ortin | catherine | F | 0 | Roman Catholic | English | Ontario | No Occupation Listed | 184 |
| 10 | ortin | esther | F | 30 | Roman Catholic | French | Quebec | No Occupation Listed | 184 |
| 14 | ortin | esther | F | 6 | Roman Catholic | English | Ontario | No Occupation Listed | 184 |
| 13 | ortin | felix | M | 9 | Roman Catholic | English | Ontario | No Occupation Listed | 184 |
| 9 | ortin | heber | M | 36 | Roman Catholic | English | Quebec | Carpenters | 184 |
| 15 | ortin | heber | M | 4 | Roman Catholic | English | Quebec | No Occupation Listed | 184 |
| 16 | ortin | john | M | 3 | Roman Catholic | English | Ontario | No Occupation Listed | 184 |
| 12 | ortin | mary | F | 11 | Roman Catholic | English | Ontario | No Occupation Listed | 184 |
| 11 | ortin | william | M | 13 | Roman Catholic | English | Ontario | No Occupation Listed | 184 |
| 12 | osborne | john | M | 25 | Presbyterian | English | England | Servants nfs | 29 |
| 6 | ouillette | francias | M | 34 | Roman Catholic | French | Quebec | Barbers | 125 |
| 7 | ouillette | mary | F | 23 | Roman Catholic | French | Quebec | No Occupation Listed | 125 |
| 3 | ouimette | adelaid | M | 3 | Roman Catholic | French | Ontario | No Occupation Listed | 275 |
| 4 | ouimette | laurilda | F | 2 | Roman Catholic | French | Ontario | No Occupation Listed | 275 |
| 1 | ouimette | ta | M | 30 | Roman Catholic | French | Quebec | Teamsters (inc. mine driver, etc.) | 275 |
| 2 | ouimette | welimine | F | 26 | Roman Catholic | French | Ontario | No Occupation Listed | 275 |
| 21 | oulette | archie | M | 1 | Roman Catholic | French | Ontario | No Occupation Listed | 227 |
| 18 | oulette | delia | F | 25 | Roman Catholic | French | Quebec | No Occupation Listed | 227 |
| 20 | oulette | eliza | F | 6 | Roman Catholic | French | Ontario | No Occupation Listed | 227 |
| 19 | oulette | georgina | F | 4 | Roman Catholic | French | Ontario | No Occupation Listed | 227 |
| 17 | oulette | joseph | M | 27 | Roman Catholic | French | Quebec | Labourers nfs | 227 |
| 17 | ouly | bridget | F | 67 | Roman Catholic | Irish | Ireland | No Occupation Listed | 75 |
| 16 | ouly | ellen | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 75 |
| 12 | ouly | james | M | 34 | Roman Catholic | Irish | Ireland | Millwrights | 75 |
| 13 | ouly | mary | F | 30 | Roman Catholic | Irish | England | No Occupation Listed | 75 |
| 14 | ouly | mary | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 75 |
| 15 | ouly | theresa | F | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 75 |