| 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 |
| OByrne | J. | Labourer | Fremantle | 1882 | WA Almanack |
| OByrne | J. | Carter | Perth | 1884 | WA Almanack |
| OByrne | J. | Labourer | Fremantle | 1884 | WA Almanack |
| OByrne | P. | House Proprietor | Fremantle | 1881 | WA Almanack |
| OByrne | P. | House Proprietor | Fremantle | 1882 | WA Almanack |
| OByrne | P. | House Proprietor | Fremantle | 1884 | WA Almanack |
| OCallaghan | F. | Schoolmaster | Perth | 1879 | WA Almanack |
| OCallaghan | F. | Schoolmaster | Perth | 1880 | WA Almanack |
| OCallaghan | F. | Schoolmaster | Perth | 1881 | WA Almanack |
| OCallaghan | F. | Schoolmaster | Perth | 1884 | WA Almanack |
| OCallaghan | J. F. | R.Cath Schoolmaster | Fremantle | 1874 | WA Almanack |
| OCallaghan | J. F. | Accountant | Perth | 1889 | WA Almanack |
| OCallaghan | J.F. | Principal Roman Catholic School | Perth | 1886 | WA Almanack |
| OCallaghan | Mrs. | Householder | Perth | 1886 | WA Almanack |
| Occidental Hotel, Booth A. | | | 90 Mackie Street, Perth | 1897 | Witton's Directory |
| Ocle | R. | Brickmaker | Guildford | 1877 | Herald Almanack |
| OConnel | D. | P.C. | Road Between Perth & Albany (Gordon(Mt. Barker)) | 1872 | WA Almanack |
| OConnel | J. | Singer Sewing Co. | Fremantle | 1884 | WA Almanack |
| OConnell | D. | P.C. | Albany Road (Gordon) (Mountt Barker) | 1873 | WA Almanack |
| OConnell | D. | Sergeant of Police | Victoria District (Greenough) | 1880 | WA Almanack |
| OConnell | D. | Sergeant of Police | Victoria District (Greenough) | 1881 | WA Almanack |
| OConnell | D. | Segt. of Police | Victoria District (Greenough) | 1884 | WA Almanack |
| OConnell | D. | Sergeant. Police | York | 1889 | WA Almanack |
| OConnell | Daniel | P.C. Mt Barker | Road between Perth & Albany (Gordon)(Mt Barker) | 1869 | WA Almanack |
| OConnell | J. | Telegraph Msgnr. | Victoria District (Greenough) | 1884 | WA Almanack |
| OConnell | John | Agt. Singer Machine Co. | Perth | 1889 | WA Almanack |
| OConnor | H. | Master Mariner | North-West Coast (Cossack) | 1884 | WA Almanack |
| OConnor | H. | Master Mariner | North-West (Cossack) | 1889 | WA Almanack |
| OConnor | J. | Store Assistant | Fremantle | 1872 | WA Almanack |
| OConnor | J. | - | Fremantle | 1873 | WA Almanack |
| OConnor | J. | - | Fremantle | 1874 | WA Almanack |
| OConnor | J. | Tidewaiter | Fremantle | 1880 | WA Almanack |
| OConnor | J. | Tidewaiter | Fremantle | 1881 | WA Almanack |
| OConnor | J. | Tidewaiter | Fremantle | 1882 | WA Almanack |
| OConnor | J. | Tidewater Customs | Fremantle | 1884 | WA Almanack |
