| Duck | James H. | Mount Barker | Triumph Motorcycle | PL ● 11 | Plantagenet Road Board | 1922-23 |
| Duckenson | K. J. | 43 Colin Street, West Perth | Dodge | 490 | Metro Private Car | 1926-27 |
| Duckenson | K. J. | 43 Colin Street, West Perth | Dodge | 490 | Metro Private Car | 1927-28 |
| Ducksworth | - | Connells's Mill | Ford | CO ● 164 | Collie Road Board | 1927-28 |
| Ducksworth | H. | Margaret River | Ford | AU ● 35 | Augusta Road Board | 1926-27 |
| Duckworth | E. | Lake Grace | Ford | LG ● 108 | Lake Grace Road Board | 1927-28 |
| Duckworth | H. | Margaret River | Ford | AU ● 35 | Augusta Road Board | 1927-28 |
| Duckworth | M. | Alco | Ford | WA ● 190 | Manjimup Road Board | 1926-27 |
| Duckworth | M. | Alco | Ford | WA ● 190 | Manjimup Road Board | 1927-28 |
| Duckworth | Mary | Pindalup | Ford | MR ● 36 | Marradong Road Board | 1925-26 |
| Duckworth | Mary | Pindalup | Ford | MR ● 36 | Marradong Road Board | 1926-27 |
| Duddell | G. | 101 Angelo Street, South Perth | Morris-Oxford | 11220 | Metro Private Car | 1926-27 |
| Dudley | A. | Northam | Chevrolet | N ● 84 | Northam Road Board | 1926-27 |
| Dudley | A. | Northam | Chevrolet | N ● 84 | Northam Road Board | 1927-28 |
| Dudley | A. E. | Northam | Chevrolet | N ● 84 | Northam Road Board | 1924-25 |
| Dudley | A. E. | Northam | Ford | N ● 88 | Northam Road Board | 1924-25 |
| Dudley | A. E. | Northam | Chevrolet | N ● 84 | Northam Road Board | 1925-26 |
| Dudley | A. E. | Northam | Ford | N ● 88 | Northam Road Board | 1925-26 |
| Dudley | A. E. | Northam | Ford | N ● 88 | Northam Road Board | 1927-28 |
| Dudley | C. G. | Economic Chrs William Street, Perth | Morris Cowley | 14441 | Metro Private Car | 1927-28 |
| Dudley | J. | Northam | Ford | N ● 224 | Northam Road Board | 1927-28 |
| Dudley | Mrs M. M. | 4 Woodroyd Street, Mount Lawley | Morris-Oxford | 11649 | Metro Private Car | 1926-27 |
| Dudley | Mrs M. M. | 4 Woodreyd Street, Mount Lawley | Moriss Oxford | 11649 | Metro Private Car | 1927-28 |
| Dudley | R. | Northam | Chevrolet | N ● 260 | Northam Road Board | 1927-28 |
| Dudley | T. | Barrack Street | Veloce 2½ H.P. Motorcycle | P 670 | Perth Municipality | 1915 |
| Dudley | T. A. | 237 Nicholson Road | - | S 19 | Subiaco Municipality | 1916 |
| Dudley | T. A. | 237 Nicholson Road | Motorcycle | S 19 | Subiaco Municipality | 1917-18 |
| Dudley | Thos A. | 237 Nicholson Road, Subiaco | Ford | 643 | Metro Private Car | 1922-23 |
| Dudley | W. | Notham | Ford | N ● 38 | Northam Road Board | 1922-23 |
| Dudley | W. | Northam | Buick | N ● 64 | Northam Road Board | 1925-26 |
| Dudley | W. | Southern Brook | Buick | N ● 67 | Northam Road Board | 1926-27 |
| Dudley | W. | Southern Brook | Buick | N ● 64 | Northam Road Board | 1927-28 |
| Dudley | William | Southern Brook | Ford 20 H.P. | N 38 | Northam Road Board | 1919 |
| Dudley | Wm. | Northam | Buick | N ● 64 | Northam Road Board | 1923-24 |
| Dudley | Wm. | Northam | Buick | N ● 64 | Northam Road Board | 1924-25 |
| Dudley & Dwyer | - | Economic Chambers, Perth | Ford | 643 | Metro Private Car | 1924-25 |
| Dudley & Dwyer | - | Economic Chambers, Perth | Ford | 7834 | Metro Private Car | 1925-26 |
| Dudley & Dwyer | - | Economic Chambers, Perth | Ford | 8259 | Metro Private Car | 1925-26 |
| Dudley & Dwyer | - | Economic Chambers, William St | Morris-Cowley | 11147 | Metro Private Car | 1926-27 |
| Dudley & Dwyer | - | Economic Chambers, Perth | Chevrolet | 7848 | Metro Private Car | 1926-27 |
| Dudley & Dwyer | - | Economic Chrs William St. Perth | Morr's Truck | 14904 | Metro Private Car | 1927-28 |
| Dudley & Dwyer | - | William Street, Perth | Clyno | 4989 | Metro Private Car | 1927-28 |
| Dudley & Dwyer Economic Chambers | - | William Street | Morris-Cowley | 11147 | Metro Private Car | 1927-28 |
| Dudley and Dwyer | - | Economic Buildings, Perth | Ford | 643 | Metro Private Car | 1923-24 |
| Duff | A. | 86 Barker Road, Subiaco | Chevrolet | 4220 | Metro Private Car | 1924-25 |
| Duff | A. | 86 Barker Street, Subiaco | Chevrolet | 4220 | Metro Private Car | 1925-26 |
| Duff | A. | 86 Barker Road, Subiaco | Chevrolet | 4220 | Metro Private Car | 1926-27 |
| Duff | Arthur | 86 Barker Road, Subiaco | Chevrolet | 4220 | Metro Private Car | 1923-24 |
| Duff | E. | Bunbury | Buick | BY 9 | Bunbury Municipality | 1926-27 |
| Duff | E. | Bunbury | Buick | BY 9 | Bunbury Municipality | 1927-28 |
