| Oakley | T. W. | Miller | Fremantle | 1882 | WA Almanack |
| Oakley | T. W. | Miller | Fremantle | 1883 | WA Almanack |
| Oakley | T. W. | Miller | Fremantle | 1884 | Herald Almanack |
| Oakley | T. W. | Miller | Fremantle | 1884 | WA Almanack |
| Oakley | T.W. | Miller | Fremantle | 1876 | WA Almanack |
| Oakley | Wm. | | Shark Bay | 1897 | Witton's Directory |
| Oasis Hotel (Poyne, J. T.) | | | Mount Magnet | 1897 | Witton's Directory |
| Oaten | J. | Greengrocer | Guildford | 1897 | Witton's Directory |
| Oaten | S . | Farmer | Fremantle | 1883 | Herald Almanack |
| Oaten | S. | Farmer | Fremantle | 1878 | Herald Almanack |
| Oaten | S. | Farmer | Fremantle | 1879 | Herald Almanack |
| Oaten | S. | Farmer | Fremantle | 1879 | WA Almanack |
| Oaten | S. | Farmer | Fremantle | 1880 | Herald Almanack |
| Oaten | S. | Farmer | Fremantle | 1880 | WA Almanack |
| Oaten | S. | Farmer | Fremantle | 1881 | Herald Almanack |
| Oaten | S. | Farmer | Fremantle | 1881 | WA Almanack |
| Oaten | S. | Farmer | Fremantle | 1882 | Herald Almanack |
| Oaten | S. | Farmer | Fremantle | 1882 | WA Almanack |
| Oaten | S. | Farmer | Fremantle | 1884 | Herald Almanack |
| Oaten | S. | Farmer | Fremantle | 1885 | Herald Almanack |
| Oaten | S. | Farmer and Limeburner | Fremantle | 1886 | WA Almanack |
| Oaten | S. | Farmer and Limeburner | Fremantle | 1887 | WA Almanack |
| Oaten | S. | Farmer and Limeburner | Fremantle | 1888 | WA Almanack |
| Oaten | S. | Farmer and Limeburner | Fremantle | 1889 | WA Almanack |
| Oaten | Samuel | | Rockingham | 1897 | Witton's Directory |
| Oaten | W. | | South Street, Beaconsfield | 1897 | Witton's Directory |
| Oates | C. | | Raphael Street, Perth | 1897 | Witton's Directory |
| Oates | J. | | off Goderich Street, Perth | 1897 | Witton's Directory |
| Oatley | W. | | Roe Street, Perth | 1897 | Witton's Directory |
| Oats | Captain W. | | Mount's Bay Road, Perth | 1897 | Witton's Directory |
| Oats | T. | Clerk National Bank | Perth | 1867 | WA Almanack |
| Oats | W. H. | | Christmas Mine | 1897 | Witton's Directory |
| Oberthur | Tom | Plumber, Tinsmith & Ironworker | Maritana Street, Kalgoorlie | 1897 | Witton's Directory |
| OBrian | M. | Farmer | Victoria District (Greenough) | 1880 | WA Almanack |
| Obrien | J. | | James Street, Perth | 1897 | Witton's Directory |
| OBrien | M. | Farmer | Victoria District (Greenough) | 1881 | WA Almanack |
| OBrien | M. | Farmer | Victoria District (Greenough) | 1884 | WA Almanack |
| OBrien | M. | Farmer | Greenough | 1889 | WA Almanack |
| OBrien | P. | Farmer | Greenough | 1889 | WA Almanack |
| OBrien | W. | Hotel Assistant | Perth | 1889 | WA Almanack |
| OBryan | James | Tailor | Wellington (Blackwood Road) | 1880 | WA Almanack |
| Obryan | James | Tailor | Wellington District (Blackwood River) | 1886 | WA Almanack |
| OBryan | James | Tailor | Bunbury (Blackwood River) | 1888 | WA Almanack |
| OBryan | Jas. | Tailor | Wellington District (Blackwood River) | 1884 | WA Almanack |
| OBryne | J. | Labourer | Fremantle | 1889 | WA Almanack |
| OBryne | P. | House Proprietors | Fremantle | 1875 | WA Almanack |
| OBryne | P. | House Proprietor | Fremantle | 1880 | WA Almanack |
| OBryne | P. | Hotel Assistant | Fremantle | 1889 | WA Almanack |
| OBryne | P. | House Proprietor | Fremantle | 1889 | WA Almanack |
| OByrne | J. | Labourer | Fremantle | 1881 | WA Almanack |
