| DuBoulay | A. H. | Accountant | Geraldton | 1877 | Herald Almanack |
| DuBoulay | A. H. | Solicitor | Victoria District (Geraldton) | 1877 | WA Almanack |
| DuBoulay | A. H. | Accountant | Victoria District - Geraldton | 1878 | Herald Almanack |
| DuBoulay | A. H. | Solicitor | Victoria District (Geraldton) | 1879 | WA Almanack |
| DuBoulay | A. H. | Accountant | Geraldton | 1880 | Herald Almanack |
| DuBoulay | A. H. | Solicitor | Victoria District (Geraldton) | 1880 | WA Almanack |
| DuBoulay | A. H. | Solicitor | Victoria District (Geraldton) | 1881 | WA Almanack |
| DuBoulay | A. H. | Solicitor | Geraldton | 1882 | Herald Almanack |
| DuBoulay | A. H. | Solicitor | Victoria Districts (Geraldton) | 1882 | WA Almanack |
| DuBoulay | A. H. | Solicitor | Victoria District | 1884 | Herald Almanack |
| duBoulay | A. H. | Solicitor | Victoria District (Geraldton) | 1884 | WA Almanack |
| DuBoulay | A. H. | Solicitor | Geraldton | 1885 | Herald Almanack |
| duBoulay | A. H. | Solicitor | Victoria District (Geraldton) | 1886 | WA Almanack |
| DuBoulay | A. H. | Solicitor | Geraldton | 1887 | WA Almanack |
| DuBoulay | A. H. | Solicitor | Geraldton | 1888 | WA Almanack |
| DuBoulay | A. H. | Solicitor | Geraldton | 1889 | WA Almanack |
| DuBoulay | A. H. | Solicitor | Geraldton | 1897 | Witton's Directory |
| DuBoulay | F. & A. | Farmer & Graziers | Victoria District (Geraldton & Suburbs) | 1867 | WA Almanack |
| DuBoulay | F. & A. | Farmers and Graziers | Victoria District (Geraldton & Suburbs) | 1868 | WA Almanack |
| Duboulay | H. H. | Clerk of Courts | Mullewa | 1897 | Witton's Directory |
| DuBoulay | J. | Stockowner | Victoria Districts (Geraldton & Suburbs) | 1866 | WA Almanack |
| Ducas | Alfred | Laundry | Lord Street, Perth | 1897 | Witton's Directory |
| Duce | J. | | Bunbury | 1897 | Witton's Directory |
| Duck | E. | Farmer | Mount Barker | 1897 | Witton's Directory |
| Duck | E. J. | Farmer | Mount Barker | 1897 | Witton's Directory |
| Duck | H. Y. | Farmer | Mount Barker | 1897 | Witton's Directory |
| Duckham | - | Brickmaker | York | 1874 | WA Almanack |
| Duckham | Alfred | Porter | York | 1897 | Witton's Directory |
| Duckham | H | Bricklayer | York | 1879 | WA Almanack |
| Duckham | H. | Bricklayer | York | 1876 | Herald Almanack |
| Duckham | H. | Bricklayer | York | 1876 | WA Almanack |
| Duckham | H. | Brickmaker | York | 1877 | Herald Almanack |
| Duckham | H. | Bricklayer | York | 1877 | WA Almanack |
| Duckham | H. | Brickmaker | York | 1878 | Herald Almanack |
| Duckham | H. | Bricklayer | York | 1879 | Herald Almanack |
| Duckham | H. | Bricklayer | York | 1880 | Herald Almanack |
| Duckham | H. | Bricklayer | York | 1880 | WA Almanack |
| Duckham | H. | BrickLayer | York | 1881 | Herald Almanack |
| Duckham | H. | Bricklayer | York | 1881 | WA Almanack |
| Duckham | H. | Bricklayer | York | 1882 | Herald Almanack |
| Duckham | H. | Bricklayer | York | 1882 | WA Almanack |
| Duckham | H. | Bricklayer | York | 1883 | Herald Almanack |
| Duckham | H. | Bricklayer | York | 1884 | Herald Almanack |
| Duckham | H. | Brickman | York | 1884 | WA Almanack |
| Duckham | H. | Bricklayer | York | 1886 | WA Almanack |
| Duckham | H. | Brickmaker | York | 1887 | WA Almanack |
| Duckham | H. | Brickmaker | York | 1888 | WA Almanack |
| Duckham | H. | Brickmaker | York | 1889 | WA Almanack |
| Duckham | Henry | Brickmaker | York | 1885 | Herald Almanack |
| Duckham | John | Brickmaker | York | 1880 | WA Almanack |
