Residents of Oro — Sub-district M, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 6 | oades | caroline | F | 0 | Methodist | English | Ontario | No Occupation Listed | 464 |
| 4 | oades | gertrude | F | 5 | Methodist | English | Ontario | No Occupation Listed | 464 |
| 2 | oades | james | M | 29 | Methodist | English | Ontario | Farmers, general and nfs | 464 |
| 5 | oades | mary | F | 3 | Methodist | English | Ontario | No Occupation Listed | 464 |
| 3 | oades | sarah | F | 28 | Methodist | Irish | Ontario | No Occupation Listed | 464 |
| 19 | obine | caroline | F | 25 | Anglican | English | Ontario | No Occupation Listed | 112 |
| 16 | obine | elisabeth | F | 61 | Presbyterian | English | Quebec | No Occupation Listed | 111 |
| 15 | obine | james | M | 77 | Presbyterian | Irish | Ireland | Farmers, general and nfs | 111 |
| 17 | obine | jonathon | M | 17 | Presbyterian | Irish | Ontario | Farmers, general and nfs | 111 |
| 18 | obine | william | M | 29 | Anglican | Irish | Quebec | Farmers, general and nfs | 112 |
| 20 | obine | william | M | 4 | Anglican | Irish | Ontario | No Occupation Listed | 112 |
| 20 | obrien | elizabeth | F | 43 | Anglican | English | England | No Occupation Listed | 190 |
| 21 | obrien | elizabeth | F | 5 | Anglican | Irish | Ontario | No Occupation Listed | 190 |
| 19 | obrien | wm | M | 50 | Anglican | Irish | Ontario | Farmers, general and nfs | 190 |
| 16 | oconnor | emily | F | 20 | Roman Catholic | Irish | Ontario | No Occupation Listed | 447 |
| 15 | oconnor | michael | M | 23 | Roman Catholic | Irish | Ontario | Labourers nfs | 447 |
| 17 | oherrin | barbara | F | 0 | Presbyterian | Irish | Ontario | No Occupation Listed | 80 |
| 17 | oherrin | daniel | M | 60 | Roman Catholic | Irish | Ireland | Labourers nfs | 200 |
| 15 | oherrin | martha | F | 23 | Presbyterian | Scottish | Ontario | No Occupation Listed | 80 |
| 16 | oherrin | mary | F | 1 | Presbyterian | Irish | Ontario | No Occupation Listed | 80 |
| 18 | oherrin | mary | F | 24 | Roman Catholic | Irish | Ireland | No Occupation Listed | 200 |
| 14 | oherrin | patrick | M | 29 | Roman Catholic | Irish | Ireland | Labourers nfs | 80 |
| 22 | ormsby | alferd | M | 14 | Independent | Irish | Ontario | No Occupation Listed | 200 |
| 23 | ormsby | arthur | M | 12 | Independent | Irish | Ontario | No Occupation Listed | 200 |
| 1 | ormsby | charlott | F | 7 | Independent | Irish | Ontario | No Occupation Listed | 210 |
| 23 | ormsby | edward | M | 33 | Independent | Irish | Ontario | Teamsters (inc. mine driver, etc.) | 210 |
| 19 | ormsby | emma | F | 21 | Independent | Irish | Ontario | No Occupation Listed | 200 |
| 25 | ormsby | florence | F | 11 | Independent | Irish | Ontario | No Occupation Listed | 210 |
| 17 | ormsby | george | M | 59 | Independent | Irish | Ireland | Farmers, general and nfs | 200 |
| 25 | ormsby | george | M | 30 | Independent | Irish | Ontario | Farmers, general and nfs | 201 |
| 24 | ormsby | ida | F | 9 | Independent | Irish | Ontario | No Occupation Listed | 200 |
| 18 | ormsby | jane | F | 52 | Independent | Irish | Ireland | No Occupation Listed | 200 |
| 3 | ormsby | lillie | F | 0 | Independent | Irish | Ontario | No Occupation Listed | 201 |
| 2 | ormsby | louisa | F | 1 | Independent | Irish | Ontario | No Occupation Listed | 201 |
| 20 | ormsby | margaret | F | 19 | Independent | Irish | Ontario | No Occupation Listed | 200 |
| 1 | ormsby | mary | F | 25 | Independent | German | Ontario | No Occupation Listed | 201 |
| 3 | ormsby | russle | M | 3 | Independent | Irish | Ontario | No Occupation Listed | 210 |
| 21 | ormsby | sarah | F | 16 | Independent | Irish | Ontario | No Occupation Listed | 200 |
| 24 | ormsby | susan | F | 30 | Independent | English | Ontario | No Occupation Listed | 210 |
| 2 | ormsby | ursen | M | 5 | Independent | Irish | Ontario | No Occupation Listed | 210 |
| 16 | orser | christena | F | 14 | Methodist | Dutch | Ontario | No Occupation Listed | 259 |
| 14 | orser | jeramiah | M | 38 | Methodist | Dutch | Ontario | Hotel Keepers and Managers | 259 |
| 15 | orser | sarah | F | 31 | Methodist | English | Ontario | No Occupation Listed | 259 |
| 17 | orser | walter | M | 12 | Methodist | Dutch | Ontario | No Occupation Listed | 259 |
| 10 | osborne | alliice | F | 9 | Methodist | English | Ontario | No Occupation Listed | 478 |
| 9 | osborne | andrew | M | 11 | Methodist | English | Ontario | No Occupation Listed | 478 |
| 8 | osborne | berthe | M | 13 | Methodist | English | Ontario | No Occupation Listed | 478 |
| 5 | osborne | franklin | M | 16 | Methodist | English | Ontario | Farmers, general and nfs | 478 |
| 4 | osborne | mary | F | 50 | Methodist | Dutch | Ontario | No Occupation Listed | 478 |
| 6 | osborne | mary | F | 18 | Methodist | English | Ontario | No Occupation Listed | 478 |
| 7 | osborne | nadine | F | 15 | Methodist | English | Ontario | No Occupation Listed | 478 |
| 11 | osborne | olive | F | 7 | Methodist | English | Ontario | No Occupation Listed | 478 |
| 3 | osborne | wm | M | 52 | Methodist | English | England | Farmers, general and nfs | 478 |
| 25 | osler | andrew | M | 8 | Methodist | Scottish | Ontario | No Occupation Listed | 449 |
| 1 | osler | henrietta | F | 4 | Presbyterian | Scottish | Ontario | No Occupation Listed | 449 |
| 23 | osler | james | M | 32 | Methodist | Scottish | Ontario | Carpenters | 449 |
| 2 | osler | lucy | F | 3 | Methodist | Scottish | Ontario | No Occupation Listed | 449 |
| 24 | osler | mary | F | 26 | Methodist | English | Ontario | No Occupation Listed | 449 |
| 3 | osler | mary | F | 1 | Methodist | Scottish | Ontario | No Occupation Listed | 449 |