| Oriol | J. | Cabinetmaker | Perth | 1877 | Herald Almanack |
| Oriol | J. | Cabinet Maker | Perth | 1877 | WA Almanack |
| Oriol | J. | Cabinet Maker | Perth | 1878 | Herald Almanack |
| Oriol | J. | Cabinet Maker | Perth | 1879 | Herald Almanack |
| Oriol | J. | House Proprietor | Perth | 1879 | WA Almanack |
| Oriol | J. | Cabinet Maker | Perth | 1880 | Herald Almanack |
| Oriol | J. | House Proprietor | Perth | 1880 | WA Almanack |
| Oriol | J. | Cabinet Maker | Perth | 1881 | Herald Almanack |
| Oriol | J. | House Proprietor | Perth | 1881 | WA Almanack |
| Oriol | J. | House Proprietor | Perth | 1882 | WA Almanack |
| Orkney | - | Overseer | Fortescue River | 1883 | Herald Almanack |
| Orkney | R. | Overseer | Fortescue River | 1879 | Herald Almanack |
| Orkney | R. | Overseer | Fortescue River | 1880 | Herald Almanack |
| Orkney | R. | Overseer | North-West Coast (Fortescue River) | 1880 | WA Almanack |
| Orkney | R. | Overseer | Fortescue River | 1881 | Herald Almanack |
| Orkney | R. | Overseer | North-West Coast (Fortescue River) | 1881 | WA Almanack |
| Orkney | R. | Overseer | Fortescue River | 1882 | Herald Almanack |
| Orkney | R. | Accountant | North-West Coast (Fortescue) | 1882 | WA Almanack |
| Orkney | R. | Overseer | North-West Coast (Fortescue River) | 1884 | WA Almanack |
| Orkney | R. | Overseer | North-West Coast (Fortescue River) | 1886 | WA Almanack |
| Orme | J. | | Market Street, Fremantle | 1897 | Witton's Directory |
| Orme | R. | Solicitor's Managing Clerk | Toorak (suburb), Coolgardie | 1897 | Witton's Directory |
| Ornell | J. | Painter | Geraldton | 1897 | Witton's Directory |
| Orook | Mrs. | | Mary Street, Fremantle | 1897 | Witton's Directory |
| Orr | J. | Farmer | Toodyay | 1886 | WA Almanack |
| Orr | James | Labourer | Victoria Districts (Geraldton) | 1882 | WA Almanack |
| Orr | James | Accountant; secretary, Yalgoo Hospital | Yalgoo | 1897 | Witton's Directory |
| Orr | Jas. | Warehouseman | Victoria District (Geraldton) | 1879 | WA Almanack |
| Orr | Jas. | Labourer | Victoria District (Geraldton) | 1880 | WA Almanack |
| Orr | Jas. | Labourer | Victoria District (Geraldton) | 1881 | WA Almanack |
| Orr | Jas. | Labourer | Geraldton | 1885 | Herald Almanack |
| Orr | John | Farmer | Toodyay | 1879 | Herald Almanack |
| Orr | John | Farmer | Toodyay | 1880 | Herald Almanack |
| Orr | John | Farmer | Toodyay | 1881 | Herald Almanack |
| Orr | John | Farmer | Toodyay | 1882 | Herald Almanack |
| Orr | John | Farmer | Toodyay | 1883 | Herald Almanack |
| Orr | John | Farmer/Sheepowner | Toodyay | 1884 | Herald Almanack |
| Orr | John | Farmer | Toodyay | 1885 | Herald Almanack |
| Orr | Mrs. | Housekeeper | Victoria District (Geraldton) | 1881 | WA Almanack |
| Orr | Mrs. | Housekeeper | Victoria Districts (Geraldton) | 1882 | WA Almanack |
| Orr | T. | Publican | Canning & Kelmscott | 1876 | WA Almanack |
| Orton | - | | Leeder Street, Perth | 1897 | Witton's Directory |
| Orton | Jos. | Farmer | Williams River | 1878 | Herald Almanack |
| Orton | Jos. | Farmer | Williams River | 1879 | Herald Almanack |
| Orton | Jos. | Farmer | Williams River | 1880 | Herald Almanack |
| Orton | Jos. | Farmer | Williams River | 1881 | Herald Almanack |
| Osborn | - | Gaoler & Constable | Newcastle | 1873 | Herald Almanack |
| Osborn | - | Gaoler & Constable | Newcastle | 1874 | WA Almanack |
| Osborn | C. | Blacksmith | Dongara | 1897 | Witton's Directory |
| Osborn | H. | Commissariat Carter | Perth | 1872 | WA Almanack |
