Residents of Gloucester — Sub-district E, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 4 | obrian | catherine | F | 26 | Roman Catholic | Irish | Ontario | No Occupation Listed | 46 |
| 2 | obrian | ellen | F | 65 | Roman Catholic | Irish | Ireland | No Occupation Listed | 46 |
| 3 | obrian | ellen | F | 28 | Roman Catholic | Irish | Ontario | No Occupation Listed | 46 |
| 1 | obrian | thomas | M | 40 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 46 |
| 4 | obrien | jane | F | 45 | Roman Catholic | Irish | Ireland | No Occupation Listed | 271 |
| 5 | oconnell | bridget | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 172 |
| 4 | oconnell | catherine | F | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 172 |
| 1 | oconnell | edision | M | 55 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 172 |
| 6 | oconnell | edward | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 172 |
| 2 | oconnell | ellen | F | 40 | Roman Catholic | Irish | Ontario | No Occupation Listed | 172 |
| 7 | oconnell | jane | F | 40 | Roman Catholic | Irish | Ontario | No Occupation Listed | 173 |
| 3 | oconnell | john | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 172 |
| 8 | oconnell | mary | F | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 173 |
| 9 | oconnell | william | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 173 |
| 11 | oconner | annia | F | 53 | Roman Catholic | Irish | Quebec | No Occupation Listed | 266 |
| 10 | oconner | fergus | M | 34 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 266 |
| 12 | oconner | james | M | 36 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 266 |
| 25 | oconnor | frances | M | 12 | Roman Catholic | Irish | Ontario | No Occupation Listed | 148 |
| 23 | oconnor | mary | F | 40 | Roman Catholic | Irish | Ireland | No Occupation Listed | 148 |
| 22 | oconnor | richard | M | 30 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 148 |
| 14 | odoherty | florence | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 12 | odoherty | g | M | 40 | Roman Catholic | Irish | Ontario | barrister at law | 97 |
| 15 | odoherty | harold | M | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 16 | odoherty | lilian | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 97 |
| 13 | odoherty | marian | F | 26 | Roman Catholic | Irish | Quebec | No Occupation Listed | 97 |
| 25 | odonell | william | M | 48 | Roman Catholic | Irish | Quebec | Farmers, general and nfs | 24 |
| 1 | odonnell | helene | F | 46 | Roman Catholic | Irish | Ontario | No Occupation Listed | 24 |
| 3 | odonnell | j | M | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 24 |
| 4 | odonnell | j | M | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 24 |
| 2 | odonnell | wm | M | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 24 |
| 2 | odougherty | charlotte | F | 65 | Roman Catholic | English | Quebec | No Occupation Listed | 1 |
| 7 | odougherty | florance | F | 19 | Roman Catholic | Irish | Ontario | No Occupation Listed | 1 |
| 3 | odougherty | go | M | 31 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 1 |
| 4 | odougherty | janney | F | 32 | Roman Catholic | Irish | Ontario | No Occupation Listed | 1 |
| 1 | odougherty | jno | M | 64 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 1 |
| 6 | odougherty | lottie | F | 22 | Roman Catholic | Irish | Ontario | No Occupation Listed | 1 |
| 5 | odougherty | mary | F | 21 | Roman Catholic | Irish | Ontario | No Occupation Listed | 1 |
| 12 | ogelvie | adeled | F | 16 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 9 | ogelvie | agnes | F | 21 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 22 | ogelvie | agnes | F | 23 | Presbyterian | Irish | Ontario | No Occupation Listed | 45 |
| 20 | ogelvie | andrew | M | 30 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 45 |
| 24 | ogelvie | andrew | M | 19 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 45 |
| 11 | ogelvie | anny | F | 18 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 15 | ogelvie | b | M | 11 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 21 | ogelvie | cathrine | F | 25 | Presbyterian | Irish | Ontario | No Occupation Listed | 45 |
| 13 | ogelvie | christina | F | 15 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 25 | ogelvie | ephrem | M | 17 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 45 |
| 8 | ogelvie | frances | F | 22 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 14 | ogelvie | j | M | 13 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 23 | ogelvie | john | M | 21 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 45 |
| 9 | ogelvie | john | M | 42 | Presbyterian | Irish | Ireland | Farmers, general and nfs | 56 |
| 17 | ogelvie | liza | F | 8 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 19 | ogelvie | margeurite | F | 59 | Presbyterian | Scottish | Scotland | Farmers, general and nfs | 45 |
| 12 | ogelvie | nancy | F | 87 | Presbyterian | Irish | Ireland | No Occupation Listed | 58 |
| 7 | ogelvie | rebecca | F | 49 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 6 | ogelvie | robert | M | 55 | Presbyterian | Irish | Ireland | Farmers, general and nfs | 22 |
| 16 | ogelvie | s | M | 9 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 10 | ogelvie | samuel | M | 40 | Presbyterian | Irish | Ireland | No Occupation Listed | 57 |
| 11 | ogelvie | sarah | F | 30 | Presbyterian | Irish | Ontario | No Occupation Listed | 57 |
| 10 | ogelvie | wm | M | 19 | Presbyterian | Irish | Ontario | No Occupation Listed | 22 |
| 15 | okeefe | daniel | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 62 |
| 12 | okeefe | denis | M | 40 | Roman Catholic | Irish | Ireland | Labourers nfs | 62 |
| 20 | okeefe | denis | M | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 62 |
| 14 | okeefe | hannah | F | 12 | Roman Catholic | Irish | England | No Occupation Listed | 62 |
| 17 | okeefe | john | M | 7 | Roman Catholic | Irish | Ontario | No Occupation Listed | 62 |
| 13 | okeefe | julia | F | 36 | Roman Catholic | Irish | Ireland | No Occupation Listed | 62 |
| 16 | okeefe | julia | F | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 62 |
| 19 | okeefe | kate | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 62 |
| 18 | okeefe | mary | F | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 62 |
| 8 | olmstead | ann | F | 8 | Anglican | English | Ontario | No Occupation Listed | 14 |
| 7 | olmstead | anna | F | 10 | Anglican | English | Ontario | No Occupation Listed | 14 |
| 5 | olmstead | charles | M | 50 | Anglican | English | Ontario | Farmers, general and nfs | 14 |
| 6 | olmstead | delanah | F | 37 | Anglican | Scottish | Ontario | No Occupation Listed | 14 |
| 9 | olmstead | geurtrude | F | 2 | Anglican | English | Ontario | No Occupation Listed | 14 |
| 10 | olmstead | liza | F | 0 | Anglican | English | Ontario | No Occupation Listed | 14 |
| 7 | omarra | james | M | 36 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 182 |
| 6 | omera | annie | F | 8 | Roman Catholic | Irish | Ireland | No Occupation Listed | 181 |
| 1 | omera | david | M | 67 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 181 |
| 4 | omera | david | M | 26 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 181 |
| 3 | omera | john | M | 39 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 181 |
| 2 | omera | mary | F | 67 | Roman Catholic | Irish | Ireland | No Occupation Listed | 181 |
| 5 | omera | mary | F | 25 | Roman Catholic | Irish | Ireland | No Occupation Listed | 181 |
| 18 | omerra | david | M | 17 | Roman Catholic | Irish | Ontario | No Occupation Listed | 106 |
| 17 | omerra | ellen | F | 40 | Roman Catholic | Irish | Ontario | No Occupation Listed | 106 |
| 16 | omerra | james | M | 50 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 106 |
| 20 | omerra | john | M | 13 | Roman Catholic | Irish | Ontario | No Occupation Listed | 106 |
| 19 | omerra | kate | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 106 |
| 21 | omerra | mary | M | 9 | Roman Catholic | Irish | Ontario | No Occupation Listed | 106 |
| 1 | oneal | bridget | F | 10 | Roman Catholic | Irish | Ontario | No Occupation Listed | 198 |
| 25 | oneal | catherine | F | 28 | Roman Catholic | Irish | Ontario | No Occupation Listed | 198 |
| 24 | oneal | garret | M | 35 | Roman Catholic | Irish | Ontario | Hotel Keepers and Managers | 198 |
| 5 | oneal | john | M | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 198 |
| 4 | oneal | martin | M | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 198 |
| 2 | oneal | patrick | M | 8 | Roman Catholic | Irish | Ontario | No Occupation Listed | 198 |
| 6 | oneal | sarah | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 198 |
| 3 | oneal | william | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 198 |
| 3 | oriley | agnes | F | 2 | Roman Catholic | Irish | Ontario | No Occupation Listed | 14 |
| 13 | oriley | andrew | M | 13 | Roman Catholic | Irish | Quebec | No Occupation Listed | 66 |
| 9 | oriley | ann | F | 40 | Roman Catholic | Irish | Quebec | No Occupation Listed | 66 |
| 10 | oriley | annie | F | 20 | Roman Catholic | Irish | Quebec | No Occupation Listed | 66 |
| 21 | oriley | catherine | F | 42 | Roman Catholic | Irish | Ireland | No Occupation Listed | 14 |
| 22 | oriley | francis | M | 23 | Roman Catholic | Irish | Ontario | No Occupation Listed | 14 |
| 24 | oriley | george | M | 18 | Roman Catholic | Irish | Ontario | No Occupation Listed | 14 |
| 15 | oriley | hannah | F | 10 | Roman Catholic | Irish | Quebec | No Occupation Listed | 66 |
| 16 | oriley | james | M | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 66 |
| 12 | oriley | jane | F | 16 | Roman Catholic | Irish | Quebec | No Occupation Listed | 66 |
| 20 | oriley | john | M | 48 | Roman Catholic | Irish | Ontario | Government functionaries nec | 14 |
| 8 | oriley | john | M | 57 | Roman Catholic | Irish | Ireland | Labourers nfs | 66 |
| 11 | oriley | margaret | F | 18 | Roman Catholic | Irish | Quebec | No Occupation Listed | 66 |
| 23 | oriley | mary | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 14 |
| 1 | oriley | robt | M | 11 | Roman Catholic | Irish | Ontario | No Occupation Listed | 14 |
| 25 | oriley | rose | F | 15 | Roman Catholic | Irish | Ontario | No Occupation Listed | 14 |
| 14 | oriley | thomas | M | 8 | Roman Catholic | Irish | Quebec | No Occupation Listed | 66 |
| 2 | oriley | wm | M | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 14 |
| 8 | orork | mary | F | 30 | Roman Catholic | Irish | Ontario | No Occupation Listed | 121 |
| 7 | orork | patrick | M | 38 | Roman Catholic | Irish | Ireland | Farmers, general and nfs | 121 |
| 9 | osmond | estar | F | 5 | Methodist | Irish | Ontario | No Occupation Listed | 116 |
| 10 | osmond | george | M | 2 | Methodist | Irish | Ontario | No Occupation Listed | 116 |
| 3 | osmond | john | M | 44 | Methodist | Irish | Ireland | Farmers, general and nfs | 116 |
| 7 | osmond | john | M | 11 | Methodist | Irish | Ontario | No Occupation Listed | 116 |
| 8 | osmond | manasa | F | 7 | Methodist | Irish | Ontario | No Occupation Listed | 116 |
| 6 | osmond | margret | F | 14 | Methodist | Irish | Ontario | No Occupation Listed | 116 |
| 4 | osmond | mary | F | 38 | Presbyterian | Irish | Ontario | No Occupation Listed | 116 |
| 5 | osmond | richard | M | 16 | Methodist | Irish | Ontario | No Occupation Listed | 116 |
| 14 | ottersa | elizabeth | F | 32 | Roman Catholic | Irish | Ontario | No Occupation Listed | 150 |
| 12 | ottersa | george | M | 22 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 150 |
| 16 | ottersa | john | M | 65 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 150 |
| 13 | ottersa | mary | F | 61 | Roman Catholic | Irish | Ireland | No Occupation Listed | 150 |
| 15 | ottersa | rose | F | 24 | Roman Catholic | Irish | Ontario | No Occupation Listed | 150 |