| Roach | Thos. | 41 Pier Street, Perth | Hudson | 600 | Metro Private Car | 1923-24 |
| Roach | V. L. | 67 Carnarvon Street, Victoria Park | Ford | 11370 | Metro Private Car | 1927-28 |
| Roach | W. A. | Narembeen | Ford | NB ● 117 | Nareembeen District Road Board | 1926-27 |
| Roach | W. A. J. | Narembeen | Ford | NB ● 116 | Narembeen Road Board | 1927-28 |
| Roach | W. A. J. | Narembeen | Ford | NB ● 129 | Narembeen Road Board | 1927-28 |
| Roack | A. P. | Fitzgerald Street, Geraldton | Buick | GN 198 | Geraldton Municipality | 1927-28 |
| Road | Board | Marble Bar | Ford Truck | MB ● 33 | Marble Bar Road Board | 1927-28 |
| Road Board | - | - | Chevrillet | NA ● 2 | Nungarin Road Board | 1924-25 |
| Road Board | - | Narrogin | Ford Truck | NO ● 71 | Narrogin Road Board | 1925-26 |
| Road Board | - | Marble Bar | Ford Truck | MB ● 33 | Marble Bar Road Board | 1925-26 |
| Road Board | - | Meekatharra | Ford Truck | MK ● 1 | Meekatharra Road Board | 1926-27 |
| Road board | - | Meekatharra | Overland | MK ● 43 | Meekatharra Road Board | 1926-27 |
| Road Board | - | Pinjarra | Vulcan Truck | MY ● 204 | Murray Road Board | 1926-27 |
| Road Board | - | Narrogin | Ford Truck | NO ● 71 | Narrogin Road Board | 1926-27 |
| Road Board | - | Wyalkatchem | International Truck | WM ● 250 | Wyalkatchem Road Board | 1926-27 |
| Road Board | - | Marble Bar | Ford Truck | MB ● 20 | Marble Bar Road Board | 1926-27 |
| Road Board | - | Marble Bar | Ford Truck | MB ● 33 | Marble Bar Road Board | 1926-27 |
| Road Board | - | Katanning | Ford Truck | KA ● 269 | Katanning Road Board | 1926-27 |
| Road Board | - | Narrogin | Ford Truck | NO ● 71 | Narrogin Road Board | 1927-28 |
| Road Board | - | Meekatharra | Ford Truck | MK ● 1 | Meekatharra Road Board | 1927-28 |
| Road Board | - | Meekatharra | International Truck | MK ● 43 | Meekatharra Road Board | 1927-28 |
| Road Board | - | Northam | Vulcan Truck | N ● 139 | Northam Road Board | 1927-28 |
| Road Board | - | Wogan Hill | Ford | WB ● 47 | Wongan-Ballidu Road Board | 1927-28 |
| Road Board | - | Wongan Hills | Ford Truck | WB ● 212 | Wongan-Ballidu Road Board | 1927-28 |
| Road Board | - | Marble Bar | Ford Truck | MB ● 20 | Marble Bar Road Board | 1927-28 |
| Road Board | - | Pinjarra | Vulcan Truck | MY ● 204 | Murray Road Board | 1927-28 |
| Road Board | - | Wyalkatchem | International Truck | WM ● 250 | Wyalkatchem Road Board | 1927-28 |
| Road Board | M. & D. | Meckering | Ford 20 H.P. | ME ● 1 | Meckering Road Board | 1917-18 |
| Roadhead | H. M. | Minninooka | Dodge | GH ● 7 | Greenough Road Board | 1926-27 |
| Roadhead | H. M. | Minninooka | Dodge | GH ● 7 | Greenough Road Board | 1927-28 |
| Roadhead | T. R. | Minninooka | Dodge | GH ● 16 | Greenough Road Board | 1925-26 |
| Roadhead & Son | T. R. | Minninooka | Overland Truck | GH ● 13 | Greenough Road Board | 1925-26 |
| Roadhead & Son | T. R. | Minninooka | Overland Truck | GH ● 13 | Greenough Road Board | 1926-27 |
| Roads | S. | Bridgetown | Ford | B ● 185 | Bridgetown Road Board | 1927-28 |
| Roads Board | - | Gnowangerup | Ford Truck | GN ● 80 | Gnowangerup Road Board | 1924-25 |
| Roads Board | - | Gomalling | Chevrolet Truck | GO ● 238 | Goomalling Road Board | 1927-28 |
| Robartson | R. H. | Nangeenan | Stewart Truck | MD ● 192 | Merredin Road Board | 1927-28 |
| Robartson | W. | Nangeenan | Chevrolet | MD ● 79 | Merredin Road Board | 1927-28 |
| Robartson | W. | Nangeenan | Graham Truck | MD ● 114 | Merredin Road Board | 1927-28 |
| Robb | S. | Throssell Street, Collie | Overland | CM 76 | Collie Municipality | 1925-26 |
| Robb | S. | Venn Street, Collie | Overland | CM 76 | Collie Municipality | 1926-27 |
| Robb | W. | Cardiff | Overland | CO ● 51 | Collie Road Board | 1925-26 |
| Robb | W. | Cardiff | Overland | CO ● 51 | Collie Road Board | 1926-27 |
| Robb | W. | Cardiff | Overland | CO ● 51 | Collie Road Board | 1927-28 |
| Robb | William | Cardiff | Ford | CO ● 8 | Collie Road Board | 1923-24 |
| Robb | Wm. | Cardiff | Ford | CO ● 8 | Collie Road Board | 1922-23 |
| Robb | Wm. | Cardiff | ford | CO ● 8 | Collie Road Board | 1924-25 |
| Robbin | A. T. | 301 High Street, Fremantle | Republic Wagon | 10746 | Metro Hire or Trade | 1927-28 |
| Robbins | A. A. | Thomas Street, Subiaco | Columbia | 7490 | Metro Private Car | 1925-26 |
| Robbins | A. A. | Thomas Street, Subiaco | Columbia | 7490 | Metro Private Car | 1926-27 |