| Duffy | J. | Bootmaker | Kojonup | 1884 | Herald Almanack |
| Duffy | J. | Bootmaker | Kojonup | 1885 | Herald Almanack |
| Duffy | James | Shoemaker (single, age 28, born in Ireland) | York | 1859 | 1859 Census |
| Duffy | Peter | Carpenter | York | 1882 | WA Almanack |
| Duffy | Peter | Carpenter | York | 1884 | WA Almanack |
| Duffy | W. V. | | Douro Street, Perth | 1897 | Witton's Directory |
| Duffy | Wm. | Boot & Shoemaker | Road between Perth & Albany (Kojonup) | 1870 | WA Almanack |
| Dufpey | J. | Bootmaker | Kojonup | 1878 | Herald Almanack |
| Dugan | T. | Labourer | Guildford | 1880 | WA Almanack |
| Dugan | T. | Labourer | Guildford | 1881 | WA Almanack |
| Dugan | T. | Labourer | Guildford | 1882 | WA Almanack |
| Dugan | T. | Labourer | Guildford | 1883 | WA Almanack |
| Dugan | T. | Labourer | Guildford | 1884 | WA Almanack |
| Dugan | T. | Labourer | Guildford | 1886 | WA Almanack |
| Dugan | Thos. J. | | William Street, Fremantle | 1897 | Witton's Directory |
| Duggan | - | Teacher Government Boys' School | Newcastle & Toodyay District | 1882 | WA Almanack |
| Duggan | J. D. | | Victoria Avenue, North Fremantle | 1897 | Witton's Directory |
| Duggan | P. | | Smiths's Mill | 1897 | Witton's Directory |
| Duggan | T. | - | Newcastle & Toodyay District | 1884 | WA Almanack |
| Duggan | T. | - | Newcastle | 1887 | WA Almanack |
| Duggan | Thos. | Tutor | Newcastle | 1888 | WA Almanack |
| Duggan | Thos. | Tutor | Newcastle | 1889 | WA Almanack |
| Duglas | W. | Laborer | Karridale | 1897 | Witton's Directory |
| Duke | F. | Faller | Jarrahdale Timber Co. | 1883 | Herald Almanack |
| Duke | F. | Faller | Jarrahdale Timber Co. | 1884 | Herald Almanack |
| Duke | J. | | William Street, Beaconsfield | 1897 | Witton's Directory |
| Duke of York Restaurant | Casas, E. R. | Proprietor | 20-24 Murray Street, Perth | 1897 | Witton's Directory |
| Dulley | E. | Farmer | Northam | 1876 | Herald Almanack |
| Dumaresq | John G. | Miner | Kanowna | 1897 | Witton's Directory |
| Dumaresq | O. | Miner | Abbott's, Nannine | 1897 | Witton's Directory |
| Dumsday | Geo. | Estate Agent | Havelock Street, Perth | 1897 | Witton's Directory |
| Dunbar | James | Carter | McDonald Street, Coolgardie | 1897 | Witton's Directory |
| Dunbell & Dunn | | Contractors | Roebourne | 1897 | Witton's Directory |
| Duncan | - | Police Constable | Albany | 1878 | Herald Almanack |
| Duncan | - | Police Constable | Albany | 1879 | Herald Almanack |
| Duncan | - | Police Constable | Albany | 1880 | Herald Almanack |
| Duncan | - | Police Constable | Albany | 1881 | Herald Almanack |
| Duncan | - | Police Constable | Albany | 1882 | Herald Almanack |
| Duncan | - | Constable | Albany | 1883 | Herald Almanack |
| Duncan | - | Constable | Albany | 1884 | Herald Almanack |
| Duncan | A. | Baker | Mount Magnet | 1897 | Witton's Directory |
| Duncan | Charles | Carrier | Greenough | 1897 | Witton's Directory |
| Duncan | Chas. | Farmer | Greenough | 1888 | WA Almanack |
| Duncan | Chas. | Farmer | Greenough | 1889 | WA Almanack |
| Duncan | David | Farmer | Victoria District (Greenough) | 1886 | WA Almanack |
| Duncan | David | Farmer | Greenough | 1887 | WA Almanack |
| Duncan | David | Farmer | Greenough | 1888 | WA Almanack |
| Duncan | David | Farmer | Greenough | 1889 | WA Almanack |
| Duncan | David | Farmer | Greenough | 1897 | Witton's Directory |
| Duncan | E. | Sarmer & Grazier | Beverley | 1882 | Herald Almanack |
