| Trimmer | R. | Wickepin | Durant | WK ● 176 | Wickepin Road Board | 1927-28 |
| Trimming | Alf | Woodanilling | Ford | WO ● 24 | Woodanilling Road Board | 1924-25 |
| Trimming | Alf | Tambellup | Ford | TA ● 19 | Tambellup Road Board | 1926-27 |
| Trimming | Alf | Tambellup | Ford | TA ● 19 | Tambellup Road Board | 1927-28 |
| Trimming | Alf. | Tambellup | Ford | TA ● 19 | Tambellup Road Board | 1925-26 |
| Trimming | M. W. | Woodanilling | Overland | WO ● 3 | Woodanilling Road Board | 1925-26 |
| Trimming | M. W. | Woodanilling | Overland | WO ● 3 | Woodanilling Road Board | 1926-27 |
| Trimming | M. W. | Woodanilling | Overland | WO ● 3 | Woodanilling Road Board | 1927-28 |
| Trimming Bros | - | - | Ford | WO ● 3 | Woodanilling Road Board | 1917-18 |
| Trimming Bros | - | Woodanilling | Overland | WO ● 3 | Woodanilling Road Board | 1924-25 |
| Trimming Bros. | - | Woodanilling | Ford 20 H.P. | WO 3 | Woodanilling Road Board | 1916 |
| Trimming Bros. | - | - | Ford | WO ● 3 | Woodanilling Road Board | 1919 |
| Trimms | - | Gnowangerup | Dodge | GN ● 23 | Gnowangerup Road Board | 1922-23 |
| Trindale | Robt. | 875 Wellington Street, Perth | Fiat | 2860 | Metro Private Car | 1927-28 |
| Trindall | A. M. S | Minnivale | Essex | D ● 41 | Dowerin Road Board | 1926-27 |
| Trindall | A. M. S. | Minnivale | Essex | D ● 41 | Dowerin Road Board | 1922-23 |
| Trindall | A. M. S. | Minnivale | Essex | D ● 41 | Dowerin Road Board | 1923-24 |
| Trindall | A. M. S. | Minnivale | Essex | D ● 41 | Dowerin Road Board | 1924-25 |
| Trindall | A. M. S. | Minnivale | Essex | D ● 41 | Dowerin Road Board | 1925-26 |
| Tringer | S. | Brawside Road, Mount Lawley | Nash | 11245 | Metro Private Car | 1927-28 |
| Trinidad | L. | Dowerin | Overland 15 H.P. | D ● 23 | Dowerin Road Board | 1922-23 |
| Trinidad | L. | Dowerin | Oakland | D ● 23 | Dowerin Road Board | 1923-24 |
| Trinidad | L. | Dowerin | Oakland | D ● 23 | Dowerin Road Board | 1924-25 |
| Trinidad | L. | Dowerin | Oakland | D ● 23 | Dowerin Road Board | 1925-26 |
| Trinidad | L. | Dowerin | Oakland | D ● 23 | Dowerin Road Board | 1926-27 |
| Trinidad | L. | Dowerin | Oakland | D ● 23 | Dowerin Road Board | 1927-28 |
| Trinity Church | - | Northampton | Ford | NR ● 27 | Northampton Road Board | 1925-26 |
| Trinity Church | - | Northampton | Ford | NR ● 27 | Northampton Road Board | 1926-27 |
| Triplett | E. H. | Central Avenue, Chester Park | Chevrolet | 12569 | Metro Private Car | 1927-28 |
| Triplett | G. H. | Central Avenue, Beaconsfield | Ford Truck | 10119 | Metro Hire or Trade | 1926-27 |
| Tripp | Ashby | Fitzgerald Street | Ford | N 48 | Northam Municipality | 1924-25 |
| Tripp | C. H. | Broadway, Nedlands | Rugby | 1425 | Metro Private Car | 1927-28 |
| Tripp | W. A. | Fitzgerald Street | Chevrolet | N 158 | Northam Municipality | 1926-27 |
| Tripp | W. A. | Fitzgerald Street | Essex | N 15 | Northam Municipality | 1927-28 |
| Tripp | W. A. | Fitzgerald Street | Chevrolet | N 158 | Northam Municipality | 1927-28 |
| Tripp | W. A. | Fitzgerald Street | Demonstration | N 245 | Northam Municipality | 1927-28 |
| Tripplet | W. F. | Greenbushes | Ford Truck | GR ● 42 | Greenbushes Road Board | 1927-28 |
| Triscott | J. | Fitzgerald Street | B.S.A. 3½ H.P. Motorcycle | N 1 | Northam Municipality | 1915 |
| Triscott | J. | Fitzgerald Street | B.S.A. 3½ H.P. Motorcycle | N 1 | Northam Municipality | 1916 |
| Triscott | J. | Fitzgerald Street | Dodge | N 17 | Northam Municipality | 1919 |
| Triscott | J. | 19 Regent Street, Mount Lawley | Buick | 2606 | Metro Private Car | 1924-25 |
| Triscott | J. | 19 Regent Street, Mount Lawley | Buick | 2606 | Metro Private Car | 1925-26 |
| Triscott | J. H. | Fitzgerald Street | Dodge | N 17 | Northam Municipality | 1917-18 |
| Triscott | James | 19 Regent Street, Mount Lawley | Buick | 2398 | Metro Private Car | 1923-24 |
| Triscott | Jas. | - | Triumph | N 1 | Northam Municipality | 1919 |
| Triscott | Jas. | Fitzgerald Street | Dodge | N 17 | Northam Municipality | 1922-23 |
| Triscott | Jas. | 19 Regent Street, Mount Lawley | Buick | 2398 | Metro Private Car | 1922-23 |
| Triscott | Jas. | Fitzgerald Street | Dodge | N 17 | Northam Municipality | 1923-24 |
| Triscott | Jas. | 19 Regent Street, Mount Lawley | Buick | 2606 | Metro Private Car | 1923-24 |
| Trivett-Morris | - | National Hotel, Fremantle | Ford | 1956 | Metro Private Car | 1923-24 |
