| Abernathy | Dr K. F. | Kojonup | Dodge | KO ● 49 | Kojonup Road Board | 1924-25 |
| Abernethy | Doctor K. F. | - | Dodge | KO ● 49 | Kojonup Road Board | 1923-24 |
| Abernethy | Dr K. F. | Kojonup | Maxwell | KO ● 99 | Kojonup Road Board | 1925-26 |
| Abernethy | Dr K. F. | Kojonup | Maxwell | KO ● 99 | Kojonup Road Board | 1926-27 |
| Abernethy | Dr K. F. | Kojonup | Maxwell | KO ● 99 | Kojonup Road Board | 1927-28 |
| Abernethy | John | Byford | Pontiac | A-K ● 157 | Armadale-Kelmscott Road Board | 1927-28 |
| Abernethy | K. | Merredin | Dodge | MD ● 78 | Merredin Road Board | 1922-23 |
| Aboriginal Department | - | Halls Creek, Moola Bulla Station | - | - | Halls Creek Road Board | 1919 |
| Aborigines Department | - | Moola Boola | Ford 20 H.P. | HC ● 1 | Halls Creek Road Board | 1922-23 |
| Aborigines Department | - | Moola Boola, Halls Creek | Ford | HC ● 1 | Halls Creek Road Board | 1924-25 |
| Abott | A. F. G. | Beatty Avenue, Carleye | Chevrolet | 4575 | Metro Private Car | 1923-24 |
| Abraham | A. R. | Kwolyin | Chevrolet | BK ● 114 | Bruce Rock Road Board | 1925-26 |
| Abraham | B. | Cnr. Vincent & Biger streets, Perth | Dodge | 823 | Metro Private Car | 1925-26 |
| Abraham | D W. | Janet Street, West Perth | Citroen | 7008 | Metro Private Car | 1926-27 |
| Abraham | D. | 10 Janet Street, West Perth | Austin | 7008 | Metro Private Car | 1927-28 |
| Abraham | D. | Basinghall Street, Victoria Park | Pontiac | 716 | Metro Private Car | 1927-28 |
| Abraham | J. M. | Kwolyin | Ford | BK ● 114 | Bruce Rock Road Board | 1924-25 |
| Abraham | J. M. R. | Kwolyin | Chevrolet | BK ● 114 | Bruce Rock Road Board | 1926-27 |
| Abraham | J. M. R. | Kwolyin | Chevrolet | BK ● 114 | Bruce Rock Road Board | 1927-28 |
| Abrahams | O. T. | 245 Walcott Street. Mount Lawley | Citroen | 4339 | Metro Private Car | 1923-24 |
| Acaborough | A. | Katanning | Austin | KA ● 123 | Katanning Road Board | 1926-27 |
| Ace | T. G. | Gwalia | Durant | LM ● 35 | Leonora-Malcolm Road Board | 1926-27 |
| Ace | T. G. | Gwalla | Durant | LM ● 35 | Leonora-Malcolm Road Board | 1927-28 |
| Ace & Hicks | - | Gwalia | Durant | LM ● 35 | Leonora-Malcolm Road Board | 1925-26 |
| Achimevich | S. R. | 10 Clarence Street, Mount Lawley | Morris-Cowley | 8366 | Metro Private Car | 1926-27 |
| Achimovich | S. R. | 10 Clarence Street, Perth | Ford | 2706 | Metro Private Car | 1924-25 |
| Achimovich | S. R. | 10 Clarence Street, Mount Lawley | Morris-Cowley | 8366 | Metro Private Car | 1925-26 |
| Achimovich | S. R. | 112 Clarence Street, Highgate Hill | Morris Cowley | 8366 | Metro Private Car | 1927-28 |
| Ackinson | H. B. | Armadale | Ford Ton Truck | A-K ● 35 | Armadale-Kelmscott Road Board | 1922-23 |
| Ackinson | H. B. | Armadale | Ford Ton Truck | A-K ● 35 | Armadale-Kelmscott Road Board | 1923-24 |
| Ackland | J. H | Wongan Hills | Buick | WB ● 25 | Wongan-Ballidu Road Board | 1926-27 |
| Ackland | J. H. | Wogan Hill | Hillman | WB ● 25 | Wongan-Ballidu Road Board | 1927-28 |
| Ackland | R. R. B | Wongan Hills | Ford | WB ● 30 | Wongan-Ballidu Road Board | 1926-27 |
| Ackland | W. H. | Broome Street, Cottesloe | Overland 20 H.P. | Ce 75 | Municipality of Cottesloe | 1919 |
| Acme Rubber Co | - | 933 Hay Street | Napier 15 H.P. | P 178 | Perth Municipality | 1917-18 |
| Acme Rubber Co | - | 933 Hay Street | B.S.A. 4½ H.P. Motorcycle | P 983 | Perth Municipality | 1919 |
| Acme Rubber Co | - | Hay Street, Perth | Ford | 375 | Metro Private Car | 1923-24 |
| Acme Rubber Mfg. Co | - | 933 Hay Street, Perth | Ford | 4856 | Metro Private Car | 1923-24 |
| Action | T. | 60 Ellen Street, Fremantle | Overland | 1630 | Metro Private Car | 1925-26 |
| Acton | H. & B. | 60 Ellen Street, Fremantle | Triumph | 1369 | Metro Motorcycle | 1922-23 |
| Acton | S. J. | Lalla Rookh G.M via Port Hedland | Ford | PH ● 14 | Port Hedland Road Board | 1924-25 |
| Acton | Thos. | 60 Ellen Street Fremantle | Overland | 1630 | Metro Private Car | 1923-24 |
| Acton | Thos. | 60 Ellen Street, Fremantle | Overland | 1630 | Metro Private Car | 1924-25 |
| Adair | J. | Kojonup | Buick | KO ● 70 | Kojonup Road Board | 1924-25 |
| Adair | J. | Kojonup | Buick | KO ● 70 | Kojonup Road Board | 1925-26 |
| Adair | J. | Kojonup | Buick | KO ● 70 | Kojonup Road Board | 1926-27 |
| Adair | J. | Kojonup | Buick | KO ● 70 | Kojonup Road Board | 1927-28 |
| Adair Clara | - | Woolundra | Chevrolet Truck | KE ● 137 | Kellerberrin Road Board | 1925-26 |
| Adam | B. R. | 20 Mccourt Street, Perth | Chevrolet | 4269 | Metro Private Car | 1926-27 |
| Adam | B. R. | 20 McCourt Street, West Leederville | Chevrolet | 4269 | Metro Private Car | 1927-28 |
