Note: all lines on the page with surname O'Brian are listed, see the notes on the page for the specific lines they apply to.
| Suggested Surname | Transcribed Surname | Givens | Province | District | Subdistrict | Subdistrict Number | Page | Line |
|---|---|---|---|---|---|---|---|---|
| O'Brien | O'Brian | Catherine | ON | ELGIN (West/Ouest) | Orford | e-2 | 11 | 25 |
| O'Brien | O'Brian | Alma M. | ON | ELGIN (West/Ouest) | Orford | e-2 | 11 | 26 |
| O'Brien | O'Brian | Mary | ON | PRINCE EDWARD | Picton (Town/Ville) | g-7 | 14 | 1 |
| O'Brien | O'Brian | John | ON | SIMCOE (East/Est) | Orillia (Town/Ville) | i-6 | 13 | 8 |
| O'Brien | O'Brian | James | ON | TORONTO (Centre) (City/Cité) | Ward/Quartier No. 3 | a-3 | 1 | 28 |
| O'Brien | O'Brian | Cath | ON | TORONTO (Centre) (City/Cité) | Ward/Quartier No. 3 | a-3 | 1 | 29 |
| O'Brien | O'Brian | Lucy | ON | TORONTO (Centre) (City/Cité) | Ward/Quartier No. 3 | a-3 | 1 | 30 |
| O'Brien | O'Brian | Mary | ON | TORONTO (Centre) (City/Cité) | Ward/Quartier No. 3 | a-3 | 1 | 31 |
| O'Brien | O'Brian | Emma | ON | TORONTO (Centre) (City/Cité) | Ward/Quartier No. 3 | a-3 | 1 | 32 |
| O'Brien | O'Brian | Maggie | ON | TORONTO (Centre) (City/Cité) | Ward/Quartier No. 3 | a-3 | 1 | 33 |