| Ogden | W. W. | Coyrecup | Overland | KA ● 159 | Katanning Road Board | 1925-26 |
| Ogden | W. W. | Coyrecup | Rugby | KA ● 159 | Katanning Road Board | 1926-27 |
| Ogden | W. W. | Katanning | Rugby | KA ● 159 | Katanning Road Board | 1927-28 |
| Ogden | Wm. | - | Studebaker 12-16 H.P. | KMC 25 | Kalgoorlie Municipality | 1915 |
| Ogen | E. | 364 Egan Street | Studebaker 16 H.P. | KMC 25 | Kalgoorlie Municipality | 1916 |
| Ogg | John | York | Ford | Y 119 | York Municipality | 1923-24 |
| Ogg | John | York | Ford | Y 119 | York Municipality | 1924-25 |
| Ogilvie | A. | Phillip Street, Maddington | Whippet | 14033 | Metro Private Car | 1926-27 |
| Ogilvie | A. | Phillip Street, Maddington | Whippet | 14033 | Metro Private Car | 1927-28 |
| Ogilvie | E. M. | Broome | Chevrolet | BM ● 66 | Broome Road Board | 1926-27 |
| Ogler | C. E. | 49 Perth-Fremantle Road, Claremont | Chevrolet | 15919 | Metro Private Car | 1927-28 |
| Oglesby | H. M. | 57 Rupert Street, Subiaco | Overland | 6739 | Metro Private Car | 1925-26 |
| Oglesby | H. M. | 57 Rupert Street, Subiaco | Overland | 6739 | Metro Private Car | 1926-27 |
| Oglesby | H. N. | 57 Rupert Street, Subiaco | Whippet | 6739 | Metro Private Car | 1927-28 |
| Ogston | B. | Buntine | Ford | DL ● 202 | Dalwallinu Road Board | 1927-28 |
| Ohe | P. | Mandurah | Fiat | MY ● 195 | Murray Road Board | 1926-27 |
| Ohensloger | T. E. Miss | 1158 Hay Street, Perth | Ford | 2684 | Metro Private Car | 1923-24 |
| Ohisson | C. | 173 Newcastle Street, Perth | Ford | 9698 | Metro Private Car | 1926-27 |
| Ohisson | C. | 173 Newcastle Street, Perth | Ford | 9698 | Metro Private Car | 1927-28 |
| Ohl | P. | Mandurah | Essex | MY ● 101 | Murray Road Board | 1924-25 |
| Ohl | P. | Mandurah | Essex | MY ● 101 | Murray Road Board | 1925-26 |
| Ohl | P. | Mandurah | Fiat | MY ● 195 | Murray Road Board | 1927-28 |
| Ohl | Paul | Mandurah | Ford | MY ● 42 | Murray Road Board | 1922-23 |
| Ohl | Paul | Mandurah | Ford | MY ● 42 | Murray Road Board | 1923-24 |
| Ohman | A. | Queens Chambers, William Street, Perth | Buick | 1092 | Metro Private Car | 1927-28 |
| Ohyte | Q. | Cnr. Beaufort Street & Grosvernor Road, Mount Lawley | Whippet | 12858 | Metro Private Car | 1927-28 |
| Oilver | N. T. | Wellington Street | Ford Light Lorry | N 77 | Northam Municipality | 1927-28 |
| Oiney | G. H. | 187 Roberts Road, Subiaco | Buick | 1483 | Metro Private Car | 1926-27 |
| Okely | M. | North Beach | Ford Truck | P ● 2 | Perth Road Board | 1922-23 |
| Okes | F. | Gascoyne Junction | Ford Truck | GU ● 57 | Upper Gascoyne Road Board | 1926-27 |
| Okley | A. | Hector Street, Osborne Park | Chevrolet Truck | P ● 181 | Perth Road Board | 1927-28 |
| Old | C. E. | Brookton | Chevrolet | BO ● 79 | Brookton Road Board | 1925-26 |
| Old | J. | Katanning | Ford | KA ● 141 | Katanning Road Board | 1923-24 |
| Old | J. | Katanning | Ford | KA ● 141 | Katanning Road Board | 1924-25 |
| Old | J. | Katanning | Ford | KA ● 141 | Katanning Road Board | 1925-26 |
| Old | J. | Katanning | Ford | KA ● 141 | Katanning Road Board | 1926-27 |
| Old | James | Katanning | Chevrolet Truck | KA ● 141 | Katanning Road Board | 1927-28 |
| Old & Comish | - | Katanning | Maxwell | KA ● 72 | Katanning Road Board | 1917-18 |
| Old and Comish | - | Katanning | Dodge | KA 72 | Katanning Road Board | 1919 |
| Olden | A. C. W. | Labouchere Road, South Perth | Oakland | 2346 | Metro Private Car | 1927-28 |
| Olden | Mrs A | Mooliabeenee | Oakland | CH ● 8 | Chittering Road Board | 1924-25 |
| Olden | Mrs A. | MooliaBeenie | Chevrolet | CH ● 8 | Chittering Road Board | 1923 - 1924 |
| Olden | Mrs A. | Meadow Street, Guildford | Chevrolet | 2528 | Metro Private Car | 1923-24 |
| Olden | Mrs A. | Mooliabeenee | Oakland | CH ● 8 | Chittering Road Board | 1925-26 |
| Olden | Mrs A. | Mooliabeenee | Oakland | CH ● 8 | Chittering Road Board | 1926-27 |
| Oldfield | A. | Kellerberrin | Nash | KE ● 156 | Kellerberrin Road Board | 1927-28 |
| Oldfield | R. G. | Keane Street | Ford 20 H.P. | MJ 17 | Midland Junction Municipality | 1916 |
| Oldfield | R. G. | Keane Street | Ford 20 H.P. | MJ 17 | Midland Junction Municipality | 1917-18 |
| Oldfield | R. G. | Keane Street | Ford 20 H.P. | MJ 17 | Midland Junction Municipality | 1919 |
| Oldfield | R. G. | Market Street,Guildford | Buick | 1557 | Metro Private Car | 1923-24 |
