Residents of Sydney, Town—Ville — Sub-district P, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 7 | ocallaghan | ann | F | 48 | Roman Catholic | Irish | Ireland | No Occupation Listed | 150 |
| 13 | ocallaghan | annie | F | 10 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 150 |
| 12 | ocallaghan | bridget | F | 13 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 150 |
| 9 | ocallaghan | daniel | M | 18 | Roman Catholic | Irish | Nova Scotia | Telegraph operators | 150 |
| 15 | ocallaghan | isabella | F | 52 | Roman Catholic | English | Nova Scotia | No Occupation Listed | 151 |
| 6 | ocallaghan | james | M | 60 | Roman Catholic | Irish | Ireland | Hirers out | 150 |
| 8 | ocallaghan | james | M | 20 | Roman Catholic | Irish | Nova Scotia | Painters, nfs | 150 |
| 17 | ocallaghan | james | M | 22 | Roman Catholic | Irish | Nova Scotia | Postmen | 151 |
| 20 | ocallaghan | jeremiah | F | 70 | Roman Catholic | Irish | Ireland | No Occupation Listed | 151 |
| 14 | ocallaghan | john | M | 63 | Roman Catholic | Irish | Ireland | Hirers out | 151 |
| 18 | ocallaghan | john | M | 12 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 151 |
| 11 | ocallaghan | margaret | F | 15 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 150 |
| 10 | ocallaghan | maryann | F | 17 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 150 |
| 16 | ocallaghan | robert | M | 24 | Roman Catholic | Irish | Nova Scotia | Postmen | 151 |
| 22 | oconnell | agatha | F | 6 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 188 |
| 7 | oconnell | annie | F | 4 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 112 |
| 5 | oconnell | catherine | F | 7 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 112 |
| 11 | oconnell | catherine | F | 74 | Roman Catholic | Irish | Ireland | No Occupation Listed | 112 |
| 19 | oconnell | dennis | M | 22 | Roman Catholic | Irish | Nova Scotia | Seamen | 188 |
| 20 | oconnell | elizabeth | F | 15 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 188 |
| 17 | oconnell | james | M | 47 | Roman Catholic | Irish | Nova Scotia | Tailors and tailoresses | 188 |
| 18 | oconnell | jane | F | 43 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 188 |
| 6 | oconnell | john | M | 6 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 112 |
| 2 | oconnell | margaret | F | 32 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 112 |
| 9 | oconnell | margaret | F | 0 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 112 |
| 3 | oconnell | mary | F | 11 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 112 |
| 21 | oconnell | michael | M | 12 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 188 |
| 1 | oconnell | patrick | M | 40 | Roman Catholic | Irish | Prince Edward Island | Boot and shoemakers and repairers | 112 |
| 4 | oconnell | patrick | M | 9 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 112 |
| 8 | oconnell | william | M | 2 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 112 |
| 18 | ohanley | alex | M | 48 | Roman Catholic | Scottish | Nova Scotia | Farmers, general and nfs | 40 |
| 19 | ohanley | ann | F | 58 | Roman Catholic | Scottish | Nova Scotia | No Occupation Listed | 40 |
| 20 | ohanley | daniel | M | 22 | Roman Catholic | Scottish | Nova Scotia | Farmers, general and nfs | 40 |
| 21 | ohanley | john | M | 18 | Roman Catholic | Scottish | Nova Scotia | Farmers, general and nfs | 40 |
| 3 | okeefe | ann | F | 50 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 319 |
| 6 | okeefe | annie | F | 13 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 319 |
| 7 | okeefe | charles | M | 10 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 319 |
| 10 | okeefe | edward | M | 21 | Roman Catholic | Irish | Nova Scotia | Drivers (personal, for hire) | 174 |
| 7 | okeefe | elizabeth | F | 58 | Roman Catholic | German | Nova Scotia | No Occupation Listed | 174 |
| 12 | okeefe | elizabeth | F | 14 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 174 |
| 9 | okeefe | ellen | F | 4 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 319 |
| 9 | okeefe | james | M | 25 | Roman Catholic | Irish | Nova Scotia | Salespeople, wholesale or retail trade | 174 |
| 5 | okeefe | james | M | 21 | Roman Catholic | Irish | Nova Scotia | Farmers, general and nfs | 319 |
| 6 | okeefe | john | M | 60 | Roman Catholic | Irish | Ireland | Boot and shoemakers and repairers | 174 |
| 4 | okeefe | john | M | 27 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 319 |
| 1 | okeefe | lawrence | M | 34 | Roman Catholic | Irish | Nova Scotia | Boot and shoemakers and repairers | 203 |
| 17 | okeefe | maggie | F | 17 | Roman Catholic | Irish | Nova Scotia | Servants nfs | 267 |
| 2 | okeefe | margaret | F | 32 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 203 |
| 11 | okeefe | mary | F | 18 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 174 |
| 5 | okeefe | mary | F | 15 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 309 |
| 8 | okeefe | michael | M | 28 | Roman Catholic | Irish | Nova Scotia | Fishermen | 174 |
| 2 | okeefe | patrick | M | 62 | Roman Catholic | Irish | At Sea | Farmers, general and nfs | 319 |
| 3 | okeefe | thomas | M | 0 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 203 |
| 8 | okeefe | william | M | 8 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 319 |
| 7 | oneil | freeman | M | 7 | Baptist | Scottish | Nova Scotia | No Occupation Listed | 167 |
| 8 | oneil | murray | M | 5 | Anglican | German | Nova Scotia | No Occupation Listed | 167 |
| 6 | oneil | susan | F | 33 | Baptist | Scottish | Nova Scotia | Brewers | 167 |
| 10 | ormond | bridget | F | 21 | Roman Catholic | Irish | Nova Scotia | Teachers (unspecified) | 112 |
| 14 | ormond | bridget | F | 67 | Roman Catholic | Irish | Ireland | No Occupation Listed | 240 |
| 16 | ormond | bridget | F | 20 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 240 |
| 10 | ormond | cathrine | F | 64 | Roman Catholic | Scottish | Scotland | No Occupation Listed | 239 |
| 13 | ormond | james | M | 77 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 240 |
| 12 | ormond | john | M | 10 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 239 |
| 15 | ormond | mary | F | 30 | Roman Catholic | Irish | Nova Scotia | No Occupation Listed | 240 |
| 11 | ormond | patrick | M | 32 | Roman Catholic | Irish | Nova Scotia | Mason nfs or combined | 239 |
| 9 | ormond | philip | M | 72 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 239 |
| 2 | outram | edmund | M | 53 | Anglican | English | England | No Occupation Listed | 160 |
| 3 | outram | edmund | M | 22 | Anglican | English | Nova Scotia | Seamen | 160 |
| 4 | outram | frank | M | 19 | Anglican | English | Nova Scotia | Seamen | 160 |
| 5 | outram | mark | M | 17 | Anglican | English | Nova Scotia | Seamen | 160 |