| Prosser | Theo. | Bunbury | Chevrolet | BY 64 | Bunbury Municipality | 1926-27 |
| Prosser | Thomas Edward | Karragullen | Talbot Truck | A-K ● 28 | Armadale-Kelmscott Road Board | 1923-24 |
| Prosser | Thomas Edwards | Karragullen | Talbot Truck | A-K ● 28 | Armadale-Kelmscott Road Board | 1922-23 |
| Prosser | Thos. H. | Wickepin | Ford | WK ● 17 | Wickepin Road Board | 1923-24 |
| Prosser | Thos. J. | Wickepin | Studebaker 20 H.P. | WK ● 17 | Wickepin Road Board | 1919 |
| Prosser Scott & Co | - | 351 Hay Street, Subiaco | Hudson Hearse | 563 | Metro Private Car | 1927-28 |
| Prosser Scott & Co | - | 351 Hay Street, Subiaco | Hudson | 1081 | Metro Private Car | 1927-28 |
| Prost | F. R. | 883 Hay Street, Perth | Dealers | 20022 | Metro Dealers Car | 1924-25 |
| Protherce Fremantle Trading Co | - | - | Buick | CU ● 30 | Upper Chapman Road Board | 1926-27 |
| Proud | Annie | The Terrace Fremantle | Ford | 12358 | Metro Private Car | 1927-28 |
| Proudfoot | G. A. | City Hotel | Overland 20 H.P. | P 630 | Perth Municipality | 1917-18 |
| Proudfoot | G. A. | Hay Street | Maxwell 16 H.P. | P 630 | Perth Municipality | 1919 |
| Proudfoot | G. A. | King Street, Perth | Dort | 9127 | Metro Private Car | 1927-28 |
| Proudfoot | G. T. | 90 Coghlan Road | - | S 152 | Subiaco Municipality | 1919 |
| Proudfoot | George | 52 Leake Street, Cottesloe | Singer | 7377 | Metro Private Car | 1927-28 |
| Proudfoot & Manning | - | 36 King Street, Perth | Maxwell | 649 | Metro Private Car | 1922-23 |
| Pround | Ernest | 3 Russell Street, West Leederville | Ford | 12832 | Metro Private Car | 1927-28 |
| Prout | A. | Jarrahdale | Overland 25 H.P. | SJ ● 11 | Serpentine-Jarrahdale Road Board | 1917-18 |
| Prout | A. | Jarrahdale | Overland 20 H.P. | SJ ● 11 | Serpentine-Jarrahdale Road Board | 1919 |
| Providing Co | - | Leake Street, Fremantle | Vulcan Wagon | 10128 | Metro Hire or Trade | 1927-28 |
| Providoring Co | - | Leake Street, Fremantle | Vulcan Wagon | 10128 | Metro Hire or Trade | 1926-27 |
| Prowse | A. E. C | Doodlakine | Buick | KE ● 52 | Kellerberrin Road Board | 1922-23 |
| Prowse | A. E. C | Doodlakine | Buick | KE ● 52 | Kellerberrin Road Board | 1924-25 |
| Prowse | A. E. C. | Doodlakine | Buick | KE ● 52 | Kellerberring Road Board | 1923-24 |
| Prowse | A. E. C. | Doodlakine | Willys-Knight | KE ● 387 | Kellerberrin Road Board | 1927-28 |
| Prowse | B. W. | Capel | Dodge | CP ● 26 | Capel Road Board | 1925-26 |
| Prowse | B. W. | Capel | Austin | CP ● 26 | Capel Road Board | 1926-27 |
| Prowse | B. W. | Capel | Austin | CP ● 26 | Capel Road Board | 1927-28 |
| Prowse | J H. | 67 Cleaver Street, West Perth | Buick | 9026 | Metro Private Car | 1926-27 |
| Prowse | J. H. | Cleaver Street, West Perth | Dodge | 4772 | Metro Private Car | 1923-24 |
| Prowse | J. H. | Clever Street, West Perth | Dodge | 4772 | Metro Private Car | 1924-25 |
| Prowse | J. H. | 67 Cleaver Street, Perth | Buick | 9026 | Metro Private Car | 1925-26 |
| Prowse | J. H. | Cleaver Street, West Perth | Dodge | 4772 | Metro Private Car | 1925-26 |
| Prowse | J. H. | 67 Cleaver Street, West Perth | Buick | 9026 | Metro Private Car | 1927-28 |
| Prowse | M. A. | 61 Cambridge Street, West Leederville | Ford | 5911 | Metro Private Car | 1925-26 |
| Prowse | M. A. | 61 Cambridge Street, West Leederville | Ford | 5911 | Metro Private Car | 1926-27 |
| Prowse Bros | - | Doodlakine | Ford Truck | KE ● 90 | Kellerberrin Road Board | 1924-25 |
| Prowse Bros | - | Doodlakine | Buick | KE ● 52 | Kellerberrin Road Board | 1925-26 |
| Prowse Bros | - | Doodlakine | Ford Truck | KE ● 90 | Kellerberrin Road Board | 1925-26 |
| Prowse Bros | - | Doodlakine | Buick | KE ● 52 | Kellerberrin Road Board | 1926-27 |
| Prowse Bros | - | Doodlakine | Ford Truck | KE ● 90 | Kellerberrin Road Board | 1926-27 |
| Prowse Bros | - | Doodlakine | Buick | KE ● 52 | Kellerberrin Road Board | 1927-28 |
| Prowse Bros | - | Doodlakine | Ford Truck | KE ● 90 | Kellerberrin Road Board | 1927-28 |
| Pruce | Alf. J. | Kojonup | Triumph Motorcycle | KO ● 9 | Kojonup Road Board | 1922-23 |
| Pruice | Harold | Jarrahwood | Buick | SU ● 17 | Sussex Road Board | 1923-24 |
| Prunnetts joinery Ltd | - | 98 Smith Street, Perth | Oakland | 515 | Metro Private Car | 1927-28 |
| Prunster | J. H. | York | International | Y 120 | York Municipality | 1923-24 |
| Prunster | J. H. | York | International | Y 120 | York Municipality | 1924-25 |
| Prunster | J. H. | York | International Truck | Y 120 | York Municipality | 1925-26 |
| Prunster | J. H. | York | International Truck | Y 121 | York Municipality | 1925-26 |
