Residents of Prescott, T-V — Sub-district B, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 9 | oates | catherina | F | 13 | Roman Catholic | Irish | United States | No Occupation Listed | 84 |
| 25 | oates | john | M | 8 | Roman Catholic | Irish | United States | No Occupation Listed | 275 |
| 16 | obrien | annie | F | 31 | Roman Catholic | Irish | Ontario | No Occupation Listed | 306 |
| 11 | obrien | edith | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 47 |
| 7 | obrien | ellen | F | 45 | Roman Catholic | Irish | Ontario | No Occupation Listed | 47 |
| 2 | obrien | ellen | F | 49 | Roman Catholic | Irish | Ireland | No Occupation Listed | 166 |
| 9 | obrien | helena | F | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 47 |
| 9 | obrien | james | M | 61 | Roman Catholic | Irish | Ireland | Labourers nfs | 85 |
| 19 | obrien | john | M | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 306 |
| 8 | obrien | josephene | F | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 47 |
| 13 | obrien | lily | F | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 47 |
| 15 | obrien | m | M | 31 | Roman Catholic | Irish | Ontario | lawyer | 306 |
| 12 | obrien | margaret | F | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 47 |
| 14 | obrien | margaret | F | 22 | Roman Catholic | Irish | United States | No Occupation Listed | 178 |
| 10 | obrien | mary | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 47 |
| 11 | obrien | mary | F | 28 | Roman Catholic | Irish | Ireland | No Occupation Listed | 85 |
| 18 | obrien | michael | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 306 |
| 3 | obrien | michael | M | 17 | Roman Catholic | Irish | Ontario | Labourers nfs | 166 |
| 18 | obrien | nano | F | 56 | Roman Catholic | Irish | Ireland | Housekeeper nfs | 249 |
| 6 | obrien | richard | M | 47 | Roman Catholic | Irish | Ontario | Stone masons | 47 |
| 14 | obrien | richard | M | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 47 |
| 10 | obrien | thomas | M | 24 | Roman Catholic | Irish | Ontario | Seamen | 85 |
| 1 | obrien | timothy | M | 60 | Roman Catholic | Irish | Ireland | Labourers nfs | 166 |
| 17 | obrien | william | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 306 |
| 13 | oconnel | ann | F | 26 | Roman Catholic | Irish | Ontario | Tailors and tailoresses | 269 |
| 12 | oconnel | elizabeth | F | 70 | Roman Catholic | Irish | Ireland | No Occupation Listed | 269 |
| 20 | oconnel | mary | F | 16 | Roman Catholic | Irish | Ontario | No Occupation Listed | 217 |
| 19 | oconnel | susan | F | 39 | Roman Catholic | Irish | Ontario | Milliners | 217 |
| 2 | oconnell | dennis | M | 40 | Roman Catholic | Irish | Ireland | Labourers nfs | 286 |
| 23 | oconner | anna | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 21 |
| 19 | oconner | annie | F | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 48 |
| 2 | oconner | bridget | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 21 |
| 20 | oconner | esabella | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 48 |
| 24 | oconner | isabella | F | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 21 |
| 1 | oconner | james | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 21 |
| 22 | oconner | john | M | 60 | Roman Catholic | Irish | Ireland | Labourers nfs | 21 |
| 3 | oconner | john | M | 15 | Roman Catholic | Irish | Ontario | Seamen | 21 |
| 25 | oconner | michael | M | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 21 |
| 18 | oconner | patrick | M | 24 | Roman Catholic | Irish | Ontario | Blacksmiths | 48 |
| 22 | odonnell | martha | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 123 |
| 21 | okeefe | anna | F | 30 | Roman Catholic | Irish | Ireland | No Occupation Listed | 20 |
| 20 | okeefe | michael | M | 33 | Roman Catholic | Irish | Ontario | Other Machinery Fitters and Machine Assemblers | 20 |
| 14 | oleary | edith | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 12 | oleary | emma | F | 31 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 16 | oleary | frank | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 13 | oleary | james | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 11 | oleary | john | M | 36 | Roman Catholic | Irish | United States | Hirers out | 23 |
| 15 | oleary | john | M | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 22 | oneil | andrew | M | 13 | Roman Catholic | Irish | Ontario | Printers nfs | 203 |
| 25 | oneil | margaret | F | 36 | Roman Catholic | Irish | Ireland | No Occupation Listed | 165 |
| 21 | oneil | mary | F | 37 | Roman Catholic | Irish | Ireland | Sewers and sewing machine operators | 203 |
| 23 | oneil | mary | F | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 203 |
| 24 | oneil | terrance | M | 34 | Roman Catholic | Irish | Ontario | Railroad, railway guard or conductors | 165 |
| 4 | oriley | miles | M | 43 | Roman Catholic | Irish | Ontario | Dealer, merchant etc. (Wholesale & retail trade) | 155 |
| 8 | osullivan | ann | F | 71 | Roman Catholic | Irish | Ireland | No Occupation Listed | 94 |
| 7 | owens | caraline | F | 0 | Roman Catholic | Irish | Ontario | No Occupation Listed | 63 |
| 4 | owens | harriet | F | 27 | Roman Catholic | Irish | Ontario | No Occupation Listed | 63 |
| 3 | owens | james | M | 31 | Roman Catholic | Irish | Ontario | Seamen | 63 |
| 5 | owens | mary | F | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 63 |
| 6 | owens | william | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 63 |