| ONeil | P. | Carpenter | North-West Coast (Roeburne & Cossack) | 1879 | WA Almanack |
| ONeil | Peter | Shoemaker | Victoria District (Geraldton) | 1884 | WA Almanack |
| ONeil | Peter | Shoemaker | Victoria District (Geraldton) | 1886 | WA Almanack |
| ONeil | Peter | Bootmaker | Geraldton | 1889 | WA Almanack |
| ONeil | Peter. | Shoemaker | Victoria District (Geraldton) | 1881 | WA Almanack |
| ONeil | T. | - | Toodyay (Culham) | 1874 | WA Almanack |
| ONeil | T. | Farmer | Toodyay | 1875 | WA Almanack |
| ONeil | T. | Farmer | Toodyay | 1877 | WA Almanack |
| ONeil | T. | Farmer | Newcastle & Toodyay District | 1880 | WA Almanack |
| ONeil | T. | Farmer | Gingin, Bindoon &c. | 1881 | WA Almanack |
| ONeil | T. | Farmer | Newcastle & Toodyay District | 1881 | WA Almanack |
| ONeil | T. | Farmer | Gingin, Bindoon | 1882 | WA Almanack |
| ONeil | T. | Farmer and Sheepowner | Toodyay | 1886 | WA Almanack |
| ONeil | T. & J. | Farmers | Toodyay | 1874 | WA Almanack |
| ONeil | T. & J. | Farmers | Toodyay | 1877 | WA Almanack |
| ONeil | T. & J. | Farmer and Sheepowner | Toodyay | 1886 | WA Almanack |
| ONeil | T. jun. and J. | Farmers | Toodyay | 1875 | WA Almanack |
| ONeil | Thos. | Foreman | Eucla Telegraph Line (Esperance Bay) | 1884 | WA Almanack |
| ONeill | J. | Builder and Contrctr. | Newcastle & Toodyay District | 1884 | WA Almanack |
| ONeill | J. | Builder and Contractor | Newcastle | 1889 | WA Almanack |
| ONeill | M. | Farmer | Northam | 1875 | WA Almanack |
| ONeill | M. | Farmer | Northam | 1884 | WA Almanack |
| ONeill | Miss. | Post and Telegraph Mistress | Victoria District (Dongara) | 1884 | WA Almanack |
| ONeill | T. | Farmer | Toodyay | 1869 | WA Almanack |
| ONeill | T. | Farmer | Toodyay | 1870 | WA Almanack |
| ONeill | T. | Farmer | Toodyay | 1872 | WA Almanack |
| ONeill | T. | Farmer & Grazier | Toodyay | 1873 | WA Almanack |
| ONeill | T. | Farmer | Newcastle & Toodyay District | 1884 | WA Almanack |
| ONeill | T. | Farmer | Newcastle | 1889 | WA Almanack |
| ONeill | W. | Police Constable | York | 1889 | WA Almanack |
| ONiel | - | Police Constable | Murray | 1880 | WA Almanack |
| ONiel | M. | Farmer | Northam | 1874 | WA Almanack |
| Onions | E. | Moulder | Jarrahdale | 1887 | WA Almanack |
| Onions | T. | Grocer | Barrack Street, Perth | 1897 | Witton's Directory |
| Onions | Thomas | | Ellen Street, Perth | 1897 | Witton's Directory |
| Onslow | A. C. | Attorney General | Perth | 1881 | WA Almanack |
| Onslow | A. C. | Attorney General | Perth | 1882 | WA Almanack |
| Onslow | A. C. | Chief Justice | Perth | 1884 | WA Almanack |
| Onslow | A.C. | Chief Justice | Perth | 1884 | Herald Almanack |
| Onslow | His Honor A. C. | Chief Justice | Perth | 1887 | WA Almanack |
| Onslow | His Honor A. C. | Chief Justice | Perth | 1888 | WA Almanack |
| Onslow | His Honour A. C. | Chief Justice | Perth | 1889 | WA Almanack |
| Onslow | Hon. A C. | Chief Justice | Perth | 1886 | WA Almanack |
| Onslow | Hon. A. C. | Chief Justice | Perth | 1885 | Herald Almanack |
| Onslow | Sir A. | Chief Justice | Saint George's Terrace, Perth | 1897 | Witton's Directory |
| OOonnor | J. | Tidewaiter | Fremantle | 1877 | WA Almanack |
| Ooran | J. von | Gardener | Guildford | 1897 | Witton's Directory |
| Oram | N. R. | Sec, Coolgardie Club | Sylvester Street, Coolgardie | 1897 | Witton's Directory |
| Orchard | W. | Clerk | Peak Hill | 1897 | Witton's Directory |
| Ord | B. D. | Clerk Governers Office | Perth | 1888 | WA Almanack |
