| Duff | W. & P. | Northcliffe | Chevrolet Truck | WA ● 159 | Manjimup Road Board | 1926-27 |
| Duff | W. & P. | Northcliffe | Chevrolet Truck | WA ● 159 | Manjimup Road Board | 1927-28 |
| Duff & Co | E. M. | Merredin | Ford Truck | MD ● 247 | Merredin Road Board | 1926-27 |
| Duff & Co | E. M. | Merredin | Ford Truck | MD ● 247 | Merredin Road Board | 1927-28 |
| Duff Bros | - | Balfour Street | Ford | K ● 32 | Kalgoorlie Road Board | 1926-27 |
| Duffell | J. J. | 12 Kershaw Street | - | S 62 | Subiaco Municipality | 1916 |
| Duffell | J. J. | Hamersley Road | Car | S 56 | Subiaco Municipality | 1917-18 |
| Duffell | J. J. | 135 Hamersley Road | - | S 56 | Subiaco Municipality | 1919 |
| Duffell | James | Salisbury Street, Subiaco | Vauxhall 15 H.P. | P 758 | Perth Municipality | 1917-18 |
| Duffell | Joseph | 135 Hammersley Road | Car | S 56 | Subiaco Municipality | 1916 |
| Duffell | T. | Woolwich Street, Leederville | Ford | 6300 | Metro Private Car | 1924-25 |
| Duffell & Sons | - | 24 Heytesbury Road | Studebaker 25 H.P. | S 56 | Subiaco Municipality | 1915 |
| Duffell & Sons | - | 24 Heytesbury Road | - | S 139 | Subiaco Municipality | 1919 |
| Duffield | E. F. | 180 Beach Street, Fremantle | Argyle | 1617 | Metro Private Car | 1922-23 |
| Duffield | E. F. | 180 Beach Street, Fremantle | Argyle | 1617 | Metro Private Car | 1923-24 |
| Duffield | Edwin | Beach Street | Overland 20 H.P. | F 37 | Fremantle Municipal Council | 1919 |
| Duffield | Edwin Fose | 180 Beach Street | Argyle 12 H.P. | F 37 | Fremantle Municipality | 1915 |
| Duffield | Edwin Fose | 180 Beach Street | Argyle 12 H.P. | F 37 | Fremantle Municipality | 1916 |
| Duffield | F. B. | Leake Street, Cottesloe | Overland | 6076 | Metro Private Car | 1924-25 |
| Duffield | F. B. | Leake Street, Cottesloe | Overland | 6076 | Metro Private Car | 1925-26 |
| Duffield | F. C. | 131 Hay Street, Perth | Ford | 9126 | Metro Private Car | 1926-27 |
| Duffield | F. J. | 1110 Hay Street, Perth | Ford | 9126 | Metro Private Car | 1925-26 |
| Duffield | F. J. | 131 Hay Street, Perth | Ford | 9126 | Metro Private Car | 1927-28 |
| Duffield | Harold | 26 Heytesbury Road, Subiaco | Studebaker | 127 | Metro Private Car | 1923-24 |
| Duffield | R. T. | Beach Street | Argyle 12 H.P. | F 37 | Fremantle Municipal Council | 1917-18 |
| Duffield | T. | Woolwich Street, Leederville | Ford | 6300 | Metro Private Car | 1925-26 |
| Duffield | W. A. | Northcliffe | Chevrolet | WA ● 163 | Manjimup Road Board | 1926-27 |
| Duffield | W. A. | Tyrell Street, Nedlands | Chevrolet | 2778 | Metro Private Car | 1927-28 |
| Duffy | E. J. | Three Springs | Ford | MI ● 26 | Mingenew Road Board | 1922-23 |
| Duffy | E. J. | Three Springs | Ford | MI ● 26 | Mingenew Road Board | 1923-24 |
| Duffy | E. J. | Three Springs | Ford | CA ● 26 | Carnamah Road Board | 1925-26 |
| Duffy | E. J. | Three Springs | Ford | CA ● 26 | Carnamah Road Board | 1926-27 |
| Duffy | E. J. | Three Springs | Ford | CA ● 26 | Carnamah Road Board | 1927-28 |
| Duffy | J. S. | Bowman Street, South Perth | Ansalda | 877 | Metro Private Car | 1923-24 |
| Duffy | J. S. | Bowman Street, South Perth | Ansolda | 877 | Metro Private Car | 1924-25 |
| Duffy | J. S. | Bowman Street, South Perth | Ansolda | 877 | Metro Private Car | 1925-26 |
| Duffy | J. S. | 23 Bowman Street, South Perth | Armstrong Siddeley | 11299 | Metro Private Car | 1926-27 |
| Duffy | J. S. | 23 Bowman Street, South Perth | Armstrong Sidderley | 11299 | Metro Private Car | 1927-28 |
| Duffy | L. | 104 Railway Parade, West Perth | Gomme | 9124 | Metro Private Car | 1925-26 |
| Duffy | L. | 104 Railway Parade, West Perth | Gomme | 9124 | Metro Private Car | 1926-27 |
| Duffy | L. | 104 Railway Parade, West Perth | Gncme | 9124 | Metro Private Car | 1927-28 |
| Duffy | Maurice. M | Moora | Dodge | M ● 16 | Moora Road Board | 1923-24 |
| Duffy | Mrs E. | Three Springs | Ford | CA ● 26 | Carnamah Road Board | 1924-25 |
| Duffy | R. | 252 William Street, Perth | Fiat | 13157 | Metro Private Car | 1926-27 |
| Duffy | R. | 252 William Street, Perth | Fiat | 13157 | Metro Private Car | 1927-28 |
| Dugdale | A. E. | Nungarin | Willys-Knight | NA ● 16 | Nungarin Road Board | 1925-26 |
| Dugdale | G. R. | Fairway Nedlands | Motorcycle | S 120 | Subiaco Municipality | 1917-18 |
| Dugdale | G. R. | Fairway, Nedlands | - | S 120 | Subiaco Municipality | 1919 |
| Dugdale | John Norman | Nungarin | Willys Knight | NA ● 16 | Nungarin Road Board | 1923-24 |
| Dugdale | John Norman | Nungarin | Willys Knight | NA ● 16 | Nungarin Road Board | 1924-25 |
