| Duff | J. | Fremantle Road, Victoria Park | Ford Wagon | 6176 | Metro Private Car | 1924-25 |
| Duff | J. | Fremantle Road, Victoria Park | Ford Wagon | 6176 | Metro Private Car | 1925-26 |
| Duff | J. | Fremantle Road, Victoria Park | Ford Wagon | 6176 | Metro Private Car | 1926-27 |
| Duff | J. | Fremantle Road, Victoria Park | Ford Wagon | 6176 | Metro Private Car | 1927-28 |
| Duff | J. A. | Kununoppin | Rugby | KTY ● 48 | Kununoppin-Trayning Road Board | 1927-28 |
| Duff | J. J. | - | Ford 15 H.P. | K 32 | Kalgoorlie Road Board | 1916 |
| Duff | J. J. | - | Ford 15 HP | K ● 32 | Kalgoorlie Road Board | 1917-18 |
| Duff | J. J. | - | Ford 15 H.P. | K ● 32 | Kalgoorlie Road Board | 1919 |
| Duff | J. J. | Balfour Street | Foed 20 H.P. | K ● 32 | Kalgoorlie Road Board | 1922-23 |
| Duff | J. J. | Balfower street | Ford | K ● 32 | Kalgoorlie Road Board | 1923-24 |
| Duff | J. J. | Balfour Street | Ford | K ● 32 | Kalgoorlie Road Board | 1924-25 |
| Duff | J. J. | Balfour Street, Kalgoorlie | Ford | K ● 32 | Kalgoorlie Road Board | 1925-26 |
| Duff | John | 87 Fremantle Road, Victoria Park | Willys-Knight | 8362 | Metro Private Car | 1927-28 |
| Duff | K. | Merredin | Ford 19 H.P. | MD ● 32 | Merredin Road Board | 1922-23 |
| Duff | K. | Merredin | Dodge | MD ● 32 | Merredin Road Board | 1923-24 |
| Duff | K. | Merredin | Dodge | MD ● 32 | Merredin Road Board | 1924-25 |
| Duff | K. | Merriden | Fiat | MD ● 32 | Merredin Road Board | 1925-26 |
| Duff | K. | Merredin | Flat | MD ● 32 | Merredin Road Board | 1926-27 |
| Duff | K. R | Grammar School | Douglas 2½ H.P. Motorcycle | G 13 | Guildford Municipality | 1915 |
| Duff | K. R. | Grammar School, Guildford | Douglas | G 13 | Guildford Municipality | 1916 |
| Duff | K. R. | 1300 Hay Street | Triumph 3½ H.P. Motorcycle | P 936 | Perth Municipality | 1916 |
| Duff | K. R. | C.T.A. Club Perth | Fiat | 14045 | Metro Private Car | 1926-27 |
| Duff | K. R. | C.T.A. Perth | Nash | 147 | Metro Private Car | 1927-28 |
| Duff | L. A. | Balfour Street | Ford | K ● 176 | Kalgoorlie Road Board | 1927-28 |
| Duff | R. R. | McNeil Street, Cottlesloe | Morris-Oxford 6-8 H.P. | PG 18 | Peppermint Grove Road Board | 1919 |
| Duff | T. | View Street | Sunbeam 12-16 H.P. | PG ● 47 | Peppermint Grove Road Board | 1917-18 |
| Duff | T. | View Street | Sunbeam 16 H.P. | PG ● 47 | Peppermint Grove Road Board | 1919 |
| Duff | T. | Pemberton | Ford Truck | WA ● 51 | Manjimup Road Board | 1925-26 |
| Duff | T. | Merriden | Fiat | MD ● 140 | Merredin Road Board | 1925-26 |
| Duff | T. | Merredin | Fiat | MD ● 140 | Merredin Road Board | 1926-27 |
| Duff | T. | Yandanooka | Dodge | MI ● 114 | Mingenew Road Board | 1926-27 |
| Duff | T. | Merredin | Nash | MD ● 140 | Merredin Road Board | 1927-28 |
| Duff | T. | Yandanooka | Dodge | MI ● 114 | Mingenew Road Board | 1927-28 |
| Duff | Thomas | Pemberton | Ford Truck | WA ● 51 | Warren Road Board | 1924-25 |
| Duff | Thos. | 44 Ventnor Avenue, West Perth | Sunbeam 12-16 H.P. | P 328 | Perth Municipality | 1916 |
| Duff | W. | Hovea Terrace, Perth | Ford Wagon | 6448 | Metro Private Car | 1924-25 |
| 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 |
