Residents of Kingston, Sydenham, Ward—Quartier — Sub-district F, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 19 | _oathy | robt | M | 19 | Anglican | English | England | Clerk, nfs | 253 |
| 17 | obrien | annie | F | 17 | Roman Catholic | Irish | Ontario | Seamstress | 85 |
| 15 | obrien | elizabeth | F | 36 | Roman Catholic | Irish | Ontario | No Occupation Listed | 85 |
| 18 | obrien | elizabeth | F | 15 | Roman Catholic | Irish | Ontario | Milliners | 85 |
| 19 | obrien | isabella | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 85 |
| 5 | obrien | james | M | 22 | Roman Catholic | Irish | Ireland | Ship’s carpenter | 59 |
| 16 | obrien | james | M | 22 | Roman Catholic | Irish | Ontario | Ship’s carpenter | 85 |
| 23 | obrien | mary | F | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 85 |
| 25 | obrien | mary | F | 75 | Roman Catholic | Irish | Ireland | No Occupation Listed | 129 |
| 20 | obrien | mary | F | 37 | Roman Catholic | Irish | Ireland | No Occupation Listed | 336 |
| 22 | obrien | sarah | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 85 |
| 20 | obrien | teresa | F | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 85 |
| 14 | obrien | thos | M | 46 | Roman Catholic | Irish | Ireland | Ship’s carpenter | 85 |
| 21 | obrien | william | M | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 85 |
| 16 | oconnor | annie | F | 45 | Roman Catholic | Irish | Ireland | No Occupation Listed | 18 |
| 17 | oconnor | annie | F | 21 | Roman Catholic | Irish | Ontario | Tailors and tailoresses | 18 |
| 14 | oconnor | catherine | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 66 |
| 13 | oconnor | catherine | F | 55 | Roman Catholic | Irish | Ireland | No Occupation Listed | 151 |
| 13 | oconnor | elizabeth | F | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 66 |
| 12 | oconnor | john | M | 55 | Roman Catholic | Irish | Ireland | Labourers nfs | 151 |
| 14 | oconnor | john | M | 39 | Roman Catholic | Irish | Ontario | Boot and shoemakers and repairers | 272 |
| 17 | oconnor | john | M | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 272 |
| 11 | oconnor | mary | F | 27 | Roman Catholic | Irish | Ontario | No Occupation Listed | 66 |
| 15 | oconnor | mary | F | 29 | Roman Catholic | Irish | Ontario | No Occupation Listed | 272 |
| 16 | oconnor | mary | F | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 272 |
| 18 | oconnor | richard | M | 19 | Roman Catholic | Irish | Ontario | Cigar makers | 18 |
| 15 | oconnor | rose | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 66 |
| 10 | oconnor | thomas | M | 35 | Roman Catholic | Irish | Ontario | Ships Masters and captains (Sea or Inland Waterways) | 66 |
| 12 | oconnor | thomas | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 66 |
| 1 | odonnell | john | M | 53 | Roman Catholic | Irish | Ireland | Labourers nfs | 350 |
| 25 | oliphant | matilda | F | 59 | Anglican | English | England | No Occupation Listed | 350 |
| 17 | oliver | anne | F | 33 | Anglican | Irish | Ontario | No Occupation Listed | 346 |
| 16 | oliver | charles | M | 46 | Anglican | English | Ontario | Dealer, merchant etc. (Wholesale & retail trade) | 346 |
| 18 | oliver | charles | M | 14 | Anglican | English | Ontario | No Occupation Listed | 346 |
| 24 | oliver | edward | M | 4 | Roman Catholic | English | Ontario | No Occupation Listed | 210 |
| 21 | oliver | isaac | M | 35 | Anglican | English | England | Carpenters | 210 |
| 22 | oliver | jane | F | 31 | Roman Catholic | Irish | Ontario | No Occupation Listed | 210 |
| 9 | oliver | john | M | 46 | Anglican | English | England | Teachers (Higher education) | 321 |
| 25 | oliver | mabel | F | 1 | Roman Catholic | English | Ontario | No Occupation Listed | 210 |
| 23 | oliver | margt | F | 7 | Roman Catholic | English | Ontario | No Occupation Listed | 210 |
| 10 | oliver | mary | F | 22 | Anglican | Irish | Ontario | No Occupation Listed | 321 |
| 19 | oliver | percy | M | 9 | Anglican | English | Ontario | No Occupation Listed | 346 |
| 10 | oneile | patrick | M | 40 | Roman Catholic | Irish | Ireland | Labourers nfs | 47 |
| 16 | oneill | james | M | 50 | Roman Catholic | Irish | Ireland | Labourers nfs | 118 |
| 18 | oneill | james | M | 27 | Roman Catholic | Irish | Ontario | Labourers nfs | 118 |
| 17 | oneill | margaret | F | 50 | Roman Catholic | Irish | Ireland | No Occupation Listed | 118 |
| 19 | oneill | michael | M | 20 | Roman Catholic | Irish | Ontario | Labourers nfs | 118 |
| 9 | oreilly | margaret | F | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 349 |
| 15 | oreilly | mary | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 133 |
| 8 | oreilly | mary | F | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 349 |
| 10 | oreilly | michael | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 349 |
| 16 | oreilly | william | M | 15 | Roman Catholic | Irish | Ontario | Printers nfs | 133 |
| 6 | orroll | anne | F | 45 | Anglican | Irish | Ireland | No Occupation Listed | 304 |
| 7 | orroll | mary | F | 14 | Anglican | English | Ontario | No Occupation Listed | 304 |
| 8 | orroll | sarah | F | 12 | Anglican | English | Ontario | No Occupation Listed | 304 |
| 9 | orroll | thomas | M | 10 | Anglican | English | Ontario | No Occupation Listed | 304 |
| 20 | orser | elizabeth | F | 27 | Wesleyan Methodist | German | Ontario | Servants nfs | 322 |
| 2 | osborne | edna | F | 29 | Anglican | Dutch | United States | No Occupation Listed | 184 |
| 1 | osborne | george | M | 37 | Anglican | English | England | secretary | 184 |
| 3 | osborne | george | M | 7 | Anglican | English | Ontario | No Occupation Listed | 184 |
| 6 | osullivan | mary | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 25 |
| 5 | osullivan | william | M | 50 | Roman Catholic | Irish | Ireland | Engineers (US) nfs | 25 |