Residents of Guelph — Sub-district B, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 20 | oconnell | agnes | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 14 | oconnell | andrew | M | 45 | Roman Catholic | Irish | Ireland | Labourers nfs | 39 |
| 7 | oconnell | bridget | F | 20 | Roman Catholic | Irish | Ontario | Dressmakers | 29 |
| 19 | oconnell | bridget | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 11 | oconnell | catherine | F | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 29 |
| 15 | oconnell | catherine | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 39 |
| 13 | oconnell | daniel | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 29 |
| 12 | oconnell | eliza | F | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 29 |
| 16 | oconnell | ellen | F | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 4 | oconnell | joanna | F | 50 | Roman Catholic | Irish | Ireland | No Occupation Listed | 29 |
| 5 | oconnell | john | M | 24 | Roman Catholic | Irish | Ontario | Bookkeepers nfs | 29 |
| 18 | oconnell | kate | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 17 | oconnell | mary | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 39 |
| 9 | oconnell | may | F | 17 | Roman Catholic | Irish | Ontario | Tailors and tailoresses | 29 |
| 3 | oconnell | michael | M | 50 | Roman Catholic | Irish | Ireland | Nurserymen and arboriculturalists | 29 |
| 8 | oconnell | michael | M | 18 | Roman Catholic | Irish | Ontario | Gardeners nfs | 29 |
| 6 | oconnell | nelly | F | 22 | Roman Catholic | Irish | Ontario | Milliners | 29 |
| 10 | oconnell | william | M | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 29 |
| 21 | oconnell | william | M | 91 | Roman Catholic | Irish | Ireland | No Occupation Listed | 39 |
| 1 | oconnor | david | M | 35 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 125 |
| 25 | oconnor | jeremiah | M | 35 | Roman Catholic | Irish | Ontario | No Occupation Listed | 125 |
| 14 | oconnor | margaret | F | 74 | Roman Catholic | Irish | Ireland | No Occupation Listed | 109 |
| 24 | oconnor | margaret | F | 70 | Roman Catholic | Irish | Ireland | No Occupation Listed | 125 |
| 15 | oconnor | mary | F | 10 | Roman Catholic | Irish | Ireland | No Occupation Listed | 172 |
| 24 | oconnor | mary | F | 14 | Roman Catholic | Irish | Ontario | No Occupation Listed | 182 |
| 14 | oconnor | mauris | M | 57 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 172 |
| 15 | oconnor | timothy | M | 25 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 109 |
| 14 | orourk | catherine | F | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 69 |
| 12 | orourk | christopher | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 69 |
| 8 | orourk | james | M | 22 | Roman Catholic | Irish | Ireland | No Occupation Listed | 69 |
| 9 | orourk | john | M | 19 | Roman Catholic | Irish | Ireland | Labourers nfs | 69 |
| 7 | orourk | margaret | F | 44 | Roman Catholic | Irish | Ireland | No Occupation Listed | 69 |
| 13 | orourk | mary | F | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 69 |
| 6 | orourk | patrick | M | 40 | Roman Catholic | Irish | Ireland | Labourers nfs | 69 |
| 11 | orourk | patrick | M | 14 | Roman Catholic | Irish | Ontario | Labourers nfs | 69 |
| 10 | orourk | thomas | M | 16 | Roman Catholic | Irish | Ontario | Labourers nfs | 69 |
| 19 | osborne | albert | M | 3 | Wesleyan Methodist | English | Ontario | No Occupation Listed | 121 |
| 17 | osborne | elizabeth | F | 24 | Wesleyan Methodist | Scottish | Scotland | No Occupation Listed | 121 |
| 18 | osborne | john | M | 65 | Wesleyan Methodist | English | England | Farmers, general and nfs | 121 |
| 20 | osborne | mabel | F | 1 | Wesleyan Methodist | English | Ontario | No Occupation Listed | 121 |
| 22 | osborne | susanna | F | 17 | Wesleyan Methodist | English | England | No Occupation Listed | 121 |
| 16 | osborne | william | M | 25 | Wesleyan Methodist | English | England | Farmers, general and nfs | 121 |
| 22 | otool | james | M | 71 | Roman Catholic | German | Ireland | No Occupation Listed | 182 |