| Trinidad | Louisa E. | Leases 8345/68, etc., Ejanding Road, via Dowerin | L8T | 1924 |
| Trinidad | Marg. | Commonage, Collie Burn, Collie | T9N | 1924 |
| Triplett | G. R. | Loc. 493, Denmark | 7GT and 9D, 38E | 1962 |
| Triplett | J. R. | Avon Loc.23995, Kondinin | 3JT and 46B, 38A | 1962 |
| Triplett | W. F | Hilda-Mia, Denmark | W4T and 10B, 118E | 1962 |
| Triplett & Son | J. H. C. | Silver Coin, Kondinin | DR2 and 19D, 38E | 1962 |
| Trobridge | A. L. | Woodville, Donnybrook | 5TV | 1924 |
| Tropiano | G. | Coridale, Morawa | 7JT and 17D, 110E | 1962 |
| Tropiano | P. | Emu Soak, Morawa | T5P and 21C, 107E | 1962 |
| Trotman | Albert H. | Somme Valley Orchard | T3V | 1924 |
| Trott | Geo. | Bowinga, Balladonia | GT0 | 1912 |
| Trott | Geo. | Bowinga, Balladonia | GT0 | 1924 |
| Trott | J. | Paddock-Beach Road, Bunbury | 5OT | 1962 |
| Trott | J. & E. E. | Emohruo, Gnowangerup | J2T and 49B, 19E | 1962 |
| Trott | J. & M. | Rhizanthella and Melalevea, Corrigan | Z6N and 5D, 46E | 1962 |
| Trott | Jas. | Commonage, Bunbury | 5OT | 1924 |
| Trott | P. M. | Helena, Smith's Mill | 3PM | 1912 |
| Trott | P. M. | Helena, Smith's Mill | 3PM | 1924 |
| Trotter | A. E. | 846, Wagerup | T6X and 71B, 21E | 1962 |
| Trotter | G. W. | Loc. 8129, Balingup | X6T | 1924 |
| Trotter | John | Esperance Lots 863 and 929, Scaddan | 5JT | 1926 |
| Trotter | R. | part Brooklands Estate, Balingup | R9X | 1924 |
| Trotter | R. | Dangenup, Balingup | R9X | 1962 |
| Trotter | R. M. | Perillup Estate, Perillup | 5RT and 102B, 50A | 1962 |
| Trotter | Ralph | Fernhollow, Bedfordale | T6X | 1924 |
| Trotter | Simon F. | Barbabilling Farm, via Wickepin | TO6 | 1924 |
| Troup | Alex. | Block 9186, Kukerin, East Wagin | A9T | 1924 |
| Trowbridge | Geo. | 137 Albany Road, Victoria Park | XT0 | 1924 |
| Trowse | G. L. | 461-2, 718, Denmark | YP2 | 1962 |
| Troy | E. C. | Woodloes and Caraban, Gingin | WG6 and 13C, 18E | 1962 |
| Troy | Flora E. | P. O., Gingin | 6EY | 1925 |
| Troy | Hubert Leslie | Chitnar, Gingin Brook | OU5 | 1924 |
| Troy | L. & M. | Aldershot, Gingin | 9LT | 1962 |
| Troy | L. M. A. | Mt. Hill 419, Gingin Brook, via Gingin | T3J | 1962 |
| Troy | L. T. | Chitna, Gingin Brook, via Gingin | LT7 and 8D, 15E | 1962 |
| Troy | Lionel | Chitna, Gingin | LT7 | 1912 |
| Troy | Lionel | Chitna, Gingin | LT7 | 1924 |
| Troy | M. F. | Indarra, via Tenindewa | 7TY | 1924 |
| Troy | R. J. | Coolara, Wannamal | KT0 | 1962 |
| Troy & Lionel | Hubert L. & Thos. | Chitnar, Gingin Brook | 5LU | 1924 |
| Truarn | Mary T. | Dwellingup | 2TO | 1924 |
| Trudgeon | Arthur | Trevisky Farm, Manjimup | T3X | 1924 |
| Trufitt | D. E. & A. | Avon 18268, 18299, Kwolyin | D6T and 17C, 113A | 1962 |
| Truman | Freda | Randall's Siding, Kalgoorlie | 9TF | 1924 |
| Truman | G. W. | Jarrahdale | GN9 | 1912 |
| Truman | G. W. | Jarrahdale | GN9 | 1924 |
| Truman | John | Hillside, Calcarra, via Bolgart | 0QT | 1924 |
| Trundle | H. J. | Duncans Avon 25725, Karlgarin | T9L and 6B, 111A | 1962 |
| Trundle | H. J. & M. | White House Farm and Plantagenet Loc.1415, Kulin and Mt. Barker | 8HT and 44C, 7A | 1962 |
| Trundle | R. E. | Roe 1716, Kulin | R4T and 38C, 117A | 1962 |
