| Treeby & Sons | J. | Forrest Road, Jandakot | International Wagon | 6109 | Metro Private Car | 1925-26 |
| Treeby & Sons | J. | Forrest Road, Jandakot | International Wagon | 6109 | Metro Private Car | 1926-27 |
| Treehowan | Dr Wm. | 367 Saint George's Terrace Perth | Chevrolet | 1189 | Metro Private Car | 1927-28 |
| Treeleaven | N. C. | Katanning | Overland 26 H.P. | KA ● 55 | Katanning Road Board | 1922-23 |
| Treen | W. L. | 20 Union Street, Subiaco | Ford | 5732 | Metro Private Car | 1924-25 |
| Treen | W. L. | 20 Union Street, Subiaco | Ford | 5732 | Metro Private Car | 1925-26 |
| Treen | W. L. | 20 Union Street, Subiaco | Ford | 5732 | Metro Private Car | 1926-27 |
| Treen | W. L. | 20 Union Street, Subiaco | Ford | 5732 | Metro Private Car | 1927-28 |
| Trefort | A. H. | Narrogin | Dodge | NA ● 38 | Narrogin Road Board | 1924-25 |
| Trefort | A. H. | Narrogin | Dodge | NO ● 38 | Narrogin Road Board | 1925-26 |
| Trefort | A. H. | Narrogin | Dodge | NO ● 38 | Narrogin Road Board | 1926-27 |
| Trefort | A. H. | Narrogin | Chevrolet Truck | NO ● 81 | Narrogin Road Board | 1926-27 |
| Trefort | A. H. | Narrogin | Dodge | NO ● 38 | Narrogin Road Board | 1927-28 |
| Trefort | A. H. | Narrogin | Chevrolet Truck | NO ● 81 | Narrogin Road Board | 1927-28 |
| Treganza | J. | Dangin | Ford | Q ● 33 | Quairading Road Board | 1922-23 |
| Treganza | J. | Dangin | Ford | Q ● 33 | Quairading Road Board | 1923-24 |
| Tregaskis | Bruce | 298 Perth StreetSubiaco | Excelsior | 51 | Metro Motorcycle | 1922-23 |
| Tregear | J. H. | Wickepin | Chevrolet Truck | WK ● 219 | Wickepin Road Board | 1927-28 |
| Tregenning | Dr | 12 Claremont Avenue, Claremont | Morris Oxford | 11207 | Metro Private Car | 1927-28 |
| Tregenza | J. | Dangin | Ford | Q ● 113 | Quairading Road Board | 1925-26 |
| Tregenza | J. | Dangin | Essex | Q ● 126 | Quairading Road Board | 1925-26 |
| Tregenza | J. | Dangin | Ford | Q ● 113 | Quairading Road Board | 1927-28 |
| Tregenza | J. | Dangin | Essex | Q ● 126 | Quairading Road Board | 1927-28 |
| Tregenza | Mrs M. E. | Dangin | Oldsmobile | Q ● 33 | Quairading Road Board | 1924-25 |
| Tregenza | Mrs M. E. | Dangin | Oldsmobile | Q ● 33 | Quairading Road Board | 1925-26 |
| Tregenza | Mrs M. E. | Dangin | Oldsmobile | Q ● 33 | Quairading Road Board | 1926-27 |
| Tregoning | W. C. | Morowa | Ford | PM ● 17 | Perenjori-Morawa Road Board | 1924-25 |
| Tregonning | D. R. | Claremont Avenue, Claremont | - | C 3 | Claremont Municipality | 1919 |
| Tregonning | Dr | 12 Claremont AvenueClaremont | Morris-Oxford | 11207 | Metro Private Car | 1926-27 |
| Tregonning | Dr | Claremont Avenue, Claremont | Morris Oxford | 11261 | Metro Private Car | 1927-28 |
| Tregonning | Dr | Claremont | Chevrolet | 7769 | Metro Private Car | 1927-28 |
| Tregonning | Dr D. | Claremont Avenue, Claremont | Singer | 504 | Metro Private Car | 1922-23 |
| Tregonning | Dr D. | Claremont Avenue, Claremont | Bean | 505 | Metro Private Car | 1922-23 |
| Tregonning | Dr D. | Claremont Avenue, Claremont | Dodge | 2672 | Metro Private Car | 1924-25 |
| Tregonning | F. | Perth - Fremantle Road, Claremont | Chevrolet | 7769 | Metro Private Car | 1925-26 |
| Tregonning | F. | Perth-Frementle Road, Claremont | Chevrolet | 7769 | Metro Private Car | 1926-27 |
| Tregonning | W. C. | Morowa | Ford | PM ● 17 | Perenjori-Morawa Road Board | 1925-26 |
| Tregurtha | H. | Kulin | Armstrong-Siddeley | 13883 | Metro Private Car | 1926-27 |
| Tregurtha | H. E. | Kulin | Armstrong Siddeley | KU ● 120 | Kulin Road Board | 1927-28 |
| Tregurtha | J. E. | 21 Chatsworth Road | Ford 20 H.P. | P 128 | Perth Municipality | 1915 |
| Tregurtha | J. E. | 21 Chatsworth Road | Ford 20 H.P. | P 128 | Perth Municipality | 1916 |
| Tregurtha | J. E. | 21 Chatsworth Road, North Perth | Overland | 8797 | Metro Private Car | 1925-26 |
| Tregurtha | J. E. | 21 Chatsworth Road, North Perth | Overland | 8797 | Metro Private Car | 1926-27 |
| Tregurtha | J. E. | 21 Chatsworth Road, North Perth | Overland | 8797 | Metro Private Car | 1927-28 |
| Tregurthe | C. G. | Gnarming | Overland | RE ● 31 | Roe Road Board | 1925-26 |
| Treleavan | N. J. C | Katanning | Overland | KA ● 55 | Katanning Road Board | 1924-25 |
| Treleaven | N. C. | Katanning | Overland 30 H.P. | KA 55 | Katanning Road Board | 1916 |
| Treleaven | N. C. | Katanning | Overland 30 H.P. | KA ● 55 | Katanning Road Board | 1917-18 |
| Treleaven | N. C. | Katanning | Overland 30 H.P. | KA 55 | Katanning Road Board | 1919 |
| Treleaven | N. J. C. | Katanning | Overland | KA ● 55 | Katanning Road Board | 1925-26 |
