| Ross | W. A. | Broome Street, Cottesloe | Citroen | 5829 | Metro Private Car | 1927-28 |
| Ross | W. E. | 52 Wood Street, Swanbourne | Chevrolet | 14525 | Metro Private Car | 1927-28 |
| Ross | W. M. | High Street, Fremantle | Maxwell | 4321 | Metro Private Car | 1924-25 |
| Ross | W. McL. | High Street, Fremantle | Darracq | 1839 | Metro Private Car | 1922-23 |
| Ross | William McLean | High Street, Fremantle | Maxwell | 4321 | Metro Private Car | 1923-24 |
| Ross & Cohen | - | 1 Throssell Street, Perth | Ford Wagon | 13102 | Metro Private Car | 1926-27 |
| Ross & Cohen | - | 1 Throssell Street, Perth | Ford Wagon | 14508 | Metro Private Car | 1927-28 |
| Ross Heale | C. H. | 23 View Way, Nedlands | Hupmobile | 4681 | Metro Private Car | 1923-24 |
| Ross W A. | - | Broome Street, Cottesloe | Citroen | 5829 | Metro Private Car | 1924-25 |
| Rosser | Elizabeth | Mogumber | Buick | VP ● 31 | Victoria Plains Road Board | 1925-26 |
| Rosser | Elizabeth | Mogumber | Buick | VP ● 31 | Victoria Plains Road Board | 1926-27 |
| Rosser | T. H. | Northampton | Chevrolet | NR ● 90 | Northampton Road Board | 1925-26 |
| Rosser | T. H. | Northampton | Chevrolet | NR ● 90 | Northampton Road Board | 1926-27 |
| Rosser | T. H. | Northampton | Chevrolet | NR ● 90 | Northampton Road Board | 1927-28 |
| Rosser | Thos. | Northhampton | Chevrolet | NR ● 90 | Northampton Road Board | 1924-25 |
| Rosser | W. E. | 19 Emerald Hill Terrace, West Perth | Chevrolet | 14338 | Metro Private Car | 1927-28 |
| Rossi | G. | - | Buick | BE ● 191 | Beverley Road Board | 1924-25 |
| Rossi | G. | Beverley | Buick | BE ● 191 | Beverley Road Board | 1925-26 |
| Rossi | G. B. | Pithara | Buick | DL ● 150 | Dalwallinu Road Board | 1926-27 |
| Rossi | G. B. | Pithara | Buick | DL ● 150 | Dalwallinu Road Board | 1927-28 |
| Rossiter | Cyrill | 518 Fitzgerald Street, North Perth | Morris Cowley | 12930 | Metro Private Car | 1927-28 |
| Rossiter | W. O. | Ravensthorpe | Ford Wagon | PR ● 38 | Phillips River Road Board | 1927-28 |
| Rossman Lake View & Star | E. C. | - | Austin | K ● 107 | Kalgoorlie Road Board | 1925-26 |
| Rothery | F. T. | 184 Barker Road, Subiaco | Chevrolet | 5364 | Metro Private Car | 1927-28 |
| Rothery | T. R. | 184 Barker Road, Subiaco | Essex | 13593 | Metro Private Car | 1926-27 |
| Roudin | J. | Moora | Chevrolet Truck | M ● 124 | Moora Road Board | 1927-28 |
| Roulston & Hore | - | Nungarin | Ford | NA ● 25 | Nungarin Road Board | 1927-28 |
| Roulston & Horp | - | Nungarin | Ford | NA ● 25 | Nungarin Road Board | 1925-26 |
| Roulston & Horro | - | Naungarin | Chevrolet | NA ● 25 | Nungarin Road Board | 1924-25 |
| Roulstone & Horn | - | Nungarin | Ford | NA ● 25 | Nungarin Road Board | 1924-25 |
| Roulstone and Home | - | Nungarin | Ford | NA ● 25 | Nungarin Road Board | 1923-24 |
| Rourke | Harry | Tambellup | Ford 20 H.P. | TA ● 6 | Tambellup Road Board | 1917-18 |
| Rourke | Harry | Tambellup | Ford 20 H.P. | TA ● 6 | Tambellup Road Board | 1919 |
| Rourke | W. | Throssell Street, Collie | Rugby | CM 1 | Collie Municipality | 1926-27 |
| Rourke | W. H. | Pemberton | Rugby | WA ● 264 | Manjimup Road Board | 1927-28 |
| Rourke | Wm. | 28 Walcott Street, Mount Lawley | Indian | 1166 | Metro Motorcycle | 1922-23 |
| Rouse | J. W. | Walliston | Overland | DR ● 34 | Darling Range Road Board | 1924-25 |
| Rouse | Jas. William | Kalamunda | Overland | DR ● 34 | Darling Range Road Board | 1923-24 |
| Rouse | W. H. | 116 York Road, Midland Junction | Chevrolet | 1556 | Metro Private Car | 1923-24 |
| Rouse | W. H. | 116 York Road, MIdland | Chevrolet | 1556 | Metro Private Car | 1924-25 |
| Rouse | W. H. | 56 Railway Crescent, Mount Lawley | Overland | 8519 | Metro Private Car | 1925-26 |
| Rouse | W. H. | 116 York Road, Midland Junction | Chevrolet | 1556 | Metro Private Car | 1926-27 |
| Rouse | W. H. | 3 Dene Street, Mount Lawley | Overland | 8519 | Metro Private Car | 1926-27 |
| Rouse | W. H. | 3 Dene Street, Mount Lawley | Overland | 8519 | Metro Private Car | 1927-28 |
| Rouse | W. H. | 116 York Road, Midland Junction | Chevrolet | 1556 | Metro Private Car | 1927-28 |
| Rout | B. | Gnowangerup | Gray | GN ● 98 | Gnowangerup Road Board | 1925-26 |
| Rout | B. | Gnowangerup | Gray | GN ● 98 | Gnowangerup Road Board | 1926-27 |
| Rout | B. | Gnowangerup | Gray | GN ● 98 | Gnowangerup Road Board | 1927-28 |
| Rout | B. A. | Borden | Graham Truck | GN ● 119 | Gnowangerup Road Board | 1927-28 |
| Rout | C. A. | Moora | Dodge | M ● 160 | Moora Road Board | 1926-27 |
