| Osborne | W. J. | Blacksmith | Irwin | 1879 | WA Almanack |
| Osborne | W. J. | Blacksmith | Irwin & Dongara | 1880 | Herald Almanack |
| Osborne | W. J. | Blacksmith | Victoria District (Dongara & Irwin) | 1880 | WA Almanack |
| Osborne | W. J. | Blacksmith | Victoria District (Dongara & Irwin) | 1881 | WA Almanack |
| Osborne | W. J. | Blacksmith | Victoria Districts (Dongara & Irwin) | 1882 | WA Almanack |
| Osborne | W. J. | Blacksmith | Irwin & Dongara | 1885 | Herald Almanack |
| Osborne | W. J. & Sons | Farmers | Dongara | 1888 | WA Almanack |
| Osborne | W. L. | Blacksmith | Dongara | 1887 | WA Almanack |
| Osborne | W.H. | PC & Goaler | York | 1881 | Herald Almanack |
| Osborne | W.J. | Blacksmith | Victoria District (Irwin & Dongara) | 1876 | WA Almanack |
| Osborne | William | Butcher | Victoria Districts (Geraldton & Suburbs) | 1866 | WA Almanack |
| Osborne | William | Butcher | Victoria District (Geraldton & Suburbs) | 1867 | WA Almanack |
| Osborne | William | Butcher | Victoria District (Geraldton & Suburbs) | 1868 | WA Almanack |
| Osborne | William | Butcher | Victoria District (Geraldton & Suburbs) | 1869 | WA Almanack |
| Osborne | William | Butcher | Victoria District (Geraldton & Suburbs) | 1870 | WA Almanack |
| Osborne | William | Butcher | Victoria District (Geraldton & Suburbs) | 1872 | WA Almanack |
| Osborne & Sons | W. J. | Farmers | Dongara | 1889 | WA Almanack |
| Osborue | Herbert | Engineer | Perth | 1876 | Herald Almanack |
| Osbourne | H. | Engineer | Perth | 1882 | Herald Almanack |
| Osbourne | J. | Carpenter | Greenough | 1878 | Herald Almanack |
| Osbourne | J. | Boarding House Keeper | Geraldton | 1881 | Herald Almanack |
| Osbourne | J. | Carpenter | Greenough | 1881 | Herald Almanack |
| Osbourne | J. | Boarding house Keeper | Geraldton | 1883 | Herald Almanack |
| Osbourne | Jas. | Broker | Victoria District (Geraldton) | 1879 | WA Almanack |
| Osbourne | R. | Engine Driver | Perth | 1869 | WA Almanack |
| Osbourne | W. | Butcher | Perth | 1882 | Herald Almanack |
| Osbourne | W. | Blacksmith | Irwin & Dongara | 1883 | Herald Almanack |
| Osbourne | W. | Blacksmith | Irwin & Dongara | 1884 | Herald Almanack |
| Osbourne | W. J. | Blacksmith | Irwin & Dongara | 1878 | Herald Almanack |
| Osbourne | W.J. | Blacksmith | Irwin & Dongara | 1881 | Herald Almanack |
| Ost | Lindsay | | "Hambledon Villa" Howick Street, Perth | 1897 | Witton's Directory |
| Osterlund | F. | Miner | Nannine | 1897 | Witton's Directory |
| Ostler | N. | Labourer | Newcastle | 1888 | WA Almanack |
| Ostler | N. | Labourer | Newcastle | 1889 | WA Almanack |
| Ostler | Norh. | Labourer | Newcastle | 1887 | WA Almanack |
| Oswell | F. J. A. | | Rokeby Road, Perth | 1897 | Witton's Directory |
| Oswell | W. | Clerk | Geraldton | 1897 | Witton's Directory |
| Ottaway | W. E. | | Roe Street, Perth | 1897 | Witton's Directory |
| Ottey | G. W. | Landing Waiter | Cossack | 1897 | Witton's Directory |
| Otto | J. H. | Auctioneer, Accountant and Interpreter | Albany | 1887 | WA Almanack |
| Otto | J. H. | Photographer & Interpreter | Albany | 1888 | WA Almanack |
| Otto | J. H. | Photographer & Interpreter | Albany | 1889 | WA Almanack |
| Otto | J. H. | Schoolmaster | Broome Hill | 1897 | Witton's Directory |
| Otway | M. | Farmer | Beverley | 1883 | Herald Almanack |
| Otway | M. | Farmer | Beverley | 1884 | Herald Almanack |
| Otway | M. | Farmer | Beverley | 1886 | WA Almanack |
| Otway | M. | Farmer | Beverley | 1887 | WA Almanack |
| Otway | M. | Farmer | Beverley | 1888 | WA Almanack |
| Otway | M. | Farmer | Beverley | 1889 | WA Almanack |
| Otway | Mary | Farmer | Beverley | 1879 | Herald Almanack |
