Residents of Halifax, Ward—Quartier No. 3 — Sub-district C, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 9 | oakes | susan | F | 26 | Presbyterian | Irish | Prince Edward Island | Servants nfs | 313 |
| 20 | oakly | albert | M | 22 | Roman Catholic | Irish | Nova Scotia | Painters, nfs | 160 |
| 19 | oakly | norman | M | 13 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 160 |
| 17 | oakly | susan | F | 40 | Anglican | English | Nova Scotia | No Occupation Listed | 160 |
| 16 | oakly | thomas | M | 57 | Roman Catholic | Irish | Nova Scotia | Fishermen | 160 |
| 18 | oakly | william | M | 24 | Roman Catholic | Irish | Nova Scotia | Labourers nfs | 160 |
| 15 | obrien | bridget | F | 50 | Roman Catholic | Irish | Ireland | Maltsters | 207 |
| 5 | obrien | james | M | 66 | Roman Catholic | Irish | Nova Scotia | Labourers nfs | 205 |
| 6 | obrien | jane | F | 62 | Roman Catholic | Scottish | Nova Scotia | No Occupation Listed | 205 |
| 7 | obrien | michal | M | 28 | Roman Catholic | Irish | Nova Scotia | Labourers nfs | 205 |
| 16 | oconell | catherin | F | 22 | Roman Catholic | Irish | Nova Scotia | Seamstress | 239 |
| 15 | oconell | catherine | F | 55 | Roman Catholic | Irish | Ireland | No Occupation Listed | 239 |
| 2 | oconell | martin | M | 27 | Roman Catholic | Irish | Nova Scotia | Painters, nfs | 244 |
| 17 | oconell | mary | F | 19 | Roman Catholic | Irish | Nova Scotia | Tailors and tailoresses | 239 |
| 3 | oconell | mary | F | 24 | Roman Catholic | Irish | Nova Scotia | Dressmakers | 244 |
| 25 | oconell | patrick | M | 58 | Roman Catholic | Irish | Ireland | No Occupation Listed | 244 |
| 5 | oconell | patrick | M | 16 | Roman Catholic | Irish | Nova Scotia | Ambiguous responses | 244 |
| 4 | oconell | sarah | F | 21 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 244 |
| 6 | oconell | sarah | F | 35 | Roman Catholic | Irish | Ireland | Dressmakers | 244 |
| 1 | oconell | winifred | F | 56 | Roman Catholic | Irish | Ireland | No Occupation Listed | 244 |
| 4 | oconnell | alice | F | 31 | Roman Catholic | Irish | Prince Edward Island | No Occupation Listed | 140 |
| 9 | oconnell | fredrick | M | 2 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 263 |
| 7 | oconnell | garth | M | 30 | Roman Catholic | Irish | Nova Scotia | Mason nfs or combined | 263 |
| 24 | oconnell | jno | M | 32 | Roman Catholic | Irish | Nova Scotia | Saddler and harness maker | 127 |
| 5 | oconnell | john | M | 4 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 140 |
| 11 | oconnell | lilly | F | 27 | Roman Catholic | Irish | New Brunswick | No Occupation Listed | 314 |
| 3 | oconnell | mich | M | 32 | Roman Catholic | Irish | Nova Scotia | Labourers nfs | 140 |
| 25 | oconnell | nora | F | 40 | Roman Catholic | German | Nova Scotia | No Occupation Listed | 127 |
| 8 | oconnell | sophia | F | 25 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 263 |
| 19 | oconnor | edwd | M | 55 | Roman Catholic | Irish | England | Clerk, nfs | 95 |
| 5 | odonell | edmund | M | 38 | | Irish | Nova Scotia | Mason nfs or combined | 43 |
| 6 | odonell | margret | F | 33 | Baptist | German | Nova Scotia | No Occupation Listed | 43 |
| 24 | odonnell | ann | F | 9 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 134 |
| 17 | odonnell | edwd | M | 40 | | Irish | Nova Scotia | Bricklayers | 40 |
| 25 | odonnell | edwd | M | 7 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 134 |
| 2 | odonnell | francis | M | 4 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 134 |
| 18 | odonnell | mary | F | 37 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 40 |
| 23 | odonnell | mary | F | 28 | Roman Catholic | Irish | Ireland | No Occupation Listed | 134 |
| 22 | odonnell | thos | M | 45 | Roman Catholic | Irish | Ireland | Tailors and tailoresses | 134 |
| 1 | odonnell | william | M | 5 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 134 |
| 2 | oldright | henry | M | 58 | Plymouth Brethren | English | New Brunswick | lawyer | 18 |
| 21 | oleary | anne | F | 5 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 164 |
| 20 | oleary | ellie | F | 10 | Roman Catholic | Irish | United States | No Occupation Listed | 164 |
| 18 | oleary | john | M | 37 | Roman Catholic | Irish | Ireland | Ship boat loaders and dock workers | 164 |
| 19 | oleary | mary | F | 17 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 164 |
| 10 | oliver | william | M | 23 | Baptist | African Origins | Nova Scotia | Labourers nfs | 381 |
| 22 | omaley | maggie | F | 4 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 255 |
| 18 | omaley | mary | F | 39 | Roman Catholic | Irish | Ireland | No Occupation Listed | 255 |
| 19 | omaley | mary | F | 14 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 255 |
| 21 | omaley | patrick | M | 11 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 255 |
| 20 | omaley | thomas | M | 13 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 255 |
| 17 | omaley | timothy | M | 40 | Roman Catholic | Irish | Ireland | Labourers nfs | 255 |
| 17 | omalley | alice | F | 0 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 376 |
| 14 | omalley | john | M | 4 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 376 |
| 10 | omalley | mary | F | 42 | Anglican | English | Ireland | No Occupation Listed | 376 |
| 13 | omalley | mary | F | 8 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 376 |
| 16 | omalley | richard | M | 12 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 376 |
| 9 | omalley | thomas | M | 37 | Roman Catholic | Irish | Ireland | Labourers nfs | 376 |
| 15 | omalley | thomas | M | 15 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 376 |
| 3 | oniel | elizabeth | F | 18 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 79 |
| 12 | osborne | bessie | F | 4 | Anglican | English | Nova Scotia | No Occupation Listed | 264 |
| 11 | osborne | elizebeth | F | 41 | Anglican | German | Nova Scotia | No Occupation Listed | 264 |
| 10 | osborne | william | M | 43 | Anglican | English | Nova Scotia | Common labourers or general labourers | 264 |