| Orr | W. J. | Arther River | Overland | AW ● 75 | West Arthur Road Board | 1927-28 |
| Orr | W. James | Kulikup | Overland | BU ● 9 | Blackwood (Upper) Road Board | 1923-24 |
| Orr | W. T. | Reserve Street, Wembley Park | Overland | 1668 | Metro Private Car | 1927-28 |
| Orr | Wallace | 48 Rupert Street, Subiaco | Studebaker 35 H.P. | Ce 87 | Municipality of Cottesloe | 1919 |
| Orr | Wilfred James | Kulikup | Overland | BU ● 9 | Upper Blackwood Road Board | 1922-23 |
| Orr | Wm. J. | Leederville | Ford | 976 | Metro Private Car | 1922-23 |
| Orrock | M. G. | 1238 Hay Street, Perth | Ford | 1198 | Metro Private Car | 1922-23 |
| Orrock | M. G. | Canning Beach Road, Canning Bridge | Ford | 1098 | Metro Private Car | 1923-24 |
| Orrock | M. G. | 1238 Hay Street, Perth | Ford | 1198 | Metro Private Car | 1923-24 |
| Orsalti | J. | Shotts | Studebaker | CO ● 68 | Collie Road Board | 1926-27 |
| Orsatti | J. | Shotts | Studebaker | CO ● 68 | Collie Road Board | 1925-26 |
| Orton | A. | Nembudding | Dodge | WM ● 210 | Wyalkatchem Road Board | 1926-27 |
| Orton | A. | Nembudding | Dodge | WM ● 210 | Wyalkatchem Road Board | 1927-28 |
| Orton | A. E. | Rockingham | Studebaker Truck | RO ● 65 | Rockingham Road Board | 1927-28 |
| Orton | C. L. E. | - | Dodge | M ● 77 | Moora Road Board | 1925-26 |
| Orton | C. L. E. | - | Dodge | M ● 77 | Moora Road Board | 1926-27 |
| Orton | C. L. E. | - | Dodge | M ● 77 | Moora Road Board | 1927-28 |
| Orton | J. | Mundijong | Reo Truck | SJ ● 47 | Serpentine-Jarrahdale Road Board | 1925-26 |
| Orton | J. | Jarrahdale | Graham Truck | SJ ● 109 | Serpentine-Jarrahdale Road Board | 1927-28 |
| Orton | J. | Mundijong | Reo Truck | SJ ● 134 | Serpentine-Jarrahdale Road Board | 1927-28 |
| Osborn | H. | Bruce Rock | Dodge | BK ● 169 | Bruce Rock Road Board | 1924-25 |
| Osborn | H. | Bruce Rock | Dodge | BK ● 169 | Bruce Rock Road Board | 1925-26 |
| Osborn | H. | Bruce Rock | Dodge | BK ● 169 | Bruce Rock Road Board | 1926-27 |
| Osborn | H. | Bruce Rock | Dodge | BK ● 169 | Bruce Rock Road Board | 1927-28 |
| Osborn | J. | Bruce Rock | Indian 7-9 H.P. | BR ● 2 | Bruce Rock Road Board | 1919 |
| Osborn | L. H. | Bruce Rock | Ford | BK ● 268 | Bruce Rock Road Board | 1927-28 |
| Osborn | S. | Guildford | Argyle 20 H.P. | MJ 33 | Midland Junction Municipality | 1916 |
| Osborne | A. | Allanson | Cleveland | CO ● 121 | Collie Road Board | 1926-27 |
| Osborne | A. J. | 55 Fremantle Road, Victoria Park | Overland | 5755 | Metro Private Car | 1926-27 |
| Osborne | A. J. | 55 Fremantle Road, Victoria Park | Overland | 5755 | Metro Private Car | 1927-28 |
| Osborne | D. K. | Fremantle Road, Gosnells | Fiat | 9252 | Metro Private Car | 1927-28 |
| Osborne | E. C. | Nedlands Park | Car | CL ● 23 | Claremont Road Board | 1917-18 |
| Osborne | E. C. | Nedlands Park | - | CL ● 23 | Claremont Road Board | 1919 |
| Osborne | G. W. | Meekatharra | Dodge 18-20 H.P. | MK 4 | Meekatharra Roads Borad | 1916 |
| Osborne | H. W. | Mortigalup | Overland Van | PL ● 137 | Plantagenet Road Board | 1927-28 |
| Osborne | L. V. | Mortigalup | Overland Truck | PL ● 109 | Plantagenet Road Board | 1927-28 |
| Osborne | M. H. | Bunbury | Chevrolet | BY 180 | Bunbury Municipality | 1927-28 |
| Osborne | N. | Darkan | Commerce Truck | AW ● 92 | West Arthur Road Board | 1927-28 |
| Osborne | S. | Merredin | Essex | MD ● 219 | Merredin Road Board | 1926-27 |
| Osborne | S. | Merredin | Essex | MD ● 219 | Merredin Road Board | 1927-28 |
| Osborne | T. | - | Chevrolet | CU ● 106 | Upper Chapman Road Board | 1926-27 |
| Osborne | T. | - | Chevrolet | CU ● 106 | Upper Chapman Road Board | 1927-28 |
| Osborne | W. H. | Bruce Rock | Essex for Trade or Hire | BK ● 11 | Bruce Rock Road Board | 1922-23 |
| Osborne | W. H. | Bruce Rock | Essex | BK ● 11 | Bruce Rock Road Board | 1924-25 |
| Osborne | W. H. | Bruce Rock | Buick | BK ● 172 | Bruce Rock Road Board | 1924-25 |
| Osborne | W. H. | Bruce Rock | Jewett | BK ● 11 | Bruce Rock Road Board | 1925-26 |
| Osborne | W. H. | Bruce Rock | Jewett | BK ● 11 | Bruce Rock Road Board | 1926-27 |
| Osborne | W. H. | Bruce Rock | Jewett | BK ● 11 | Bruce Rock Road Board | 1927-28 |
| Osborne | W. O. | Albany Road | Flanders 20 H.P. | VP 7 | Victoria Park Municipality | 1915 |
| Osborne | W. O. | Albany Road | Flanders 20 H.P. | VP 7 | Victoria Park Municipality | 1916 |
