| Tree | Rosetta | Yenringa, Kojonup | TO5 | 1924 |
| Treeby | E. F. & M. | Peel Estate 671, 722-3, Mandogallup | TB2 and 110B, 103A | 1962 |
| Treeby Bros. | - | Block 220, Banjupp | B5T | 1912 |
| Treeby Bros. | - | Block No. 220, Banjup | B5T | 1924 |
| Treeby Bros. | - | 220, Banjup | B5T | 1962 |
| Treffone | M. J. | 7837, 6452, Buntine | 9ME and 44B, 43E | 1962 |
| Treffone | R. H. | 333, Belmont | R7T | 1962 |
| Treffone & Marshall | R. H. & R. J. | Blocks 76, 95, 167, Yallingup | C5H and 21C, 23A | 1962 |
| Trefort | A. H. | Hillside Farm, Narrogin | AT4 | 1912 |
| Trefort | A. H. | Hillside Farm, Narrogin | AT4 | 1924 |
| Trefort | H. A. | Hillside Farm, Narrogin | AT4 and 50D, 21E | 1962 |
| Trefort | J. H. | Rocklyn, Narrogin | JT4 and 13D, 116E | 1962 |
| Tregear | J. H. | Goodlands, Coolup | J2V | 1962 |
| Tregear | R. A. R. | Auburn Grove, Wickepin | RD1 | 1926 |
| Tregear & Matthews | - | Kooringa Farm, via Wickepin | M5T | 1912 |
| Tregear & Matthews | - | Kooringa Farm, via Wickepin | M5T | 1924 |
| Tregenza | J. M. | Elsa Farm, Dangin | ZA1 | 1912 |
| Tregenza | J. M. | Elsa Farm, Dangin | ZA1 | 1924 |
| Tregenza | John | Pareora, Dangin | TZ6 | 1912 |
| Tregenza | John | Pareora, Dangin | TZ6 | 1924 |
| Tregenza | M. | Hukurere, South Caroling | 7MT and 13B, 109A | 1962 |
| Tregenza & Son | J. M. | Clarevale, Dangiu | ZA1 and 20B, 42A | 1962 |
| Tregilles | C. C. | Tree-Tops, North Dandalup | 2CT and 40B, 25E | 1962 |
| Tregilles | L. A. | Treedale, West Coolup | L7T and 16C, 106E | 1962 |
| Tregonning | Walter C. | Vict. Loc. 3932, Morawa, via Mingenew | U0T | 1924 |
| Treloar | D. | Summer Hills, Dangin | 2FT and 3C, 119A | 1962 |
| Treloar | Frank | Kelvin Grove, Mount Kokeby | 4FT | 1912 |
| Treloar | Frank | Kelvin Grove, Mt. Kokeby | 4FT | 1924 |
| Treloar | G F. | Whangooma, Kukerin | 4FT and 3B, 13E | 1962 |
| Treloar | G. F. | Beda, Boyup Brook | TZ1 and 16B, 21E | 1962 |
| Treloar | G. F. | Hillview, Boyup Brook | TZ1 and 21C, 71E | 1962 |
| Treloar | H. W. | Goodlands, Boyup Brook | 5GL and 39B, 50E | 1962 |
| Treloar | L. K. F. & R. J. | Allanoska, Woodanilling | N7T and 111B, 10A | 1962 |
| Treloar | Matthew | Ayrshire Dairy, Boulder | MT7 | 1912 |
| Treloar | Matthew | Ayrshire Dairy, Boulder | MT7 | 1924 |
| Treloar | P. E. | Roe Locs. 211, 216, Narembeen | 0PT and 21B, 7A | 1962 |
| Treloar | R. S. | Locs. 18326, 18319, Narembeen | RT5 and 3B, 28E | 1962 |
| Treloar | Thos. | Gracedale, Capel | V2T | 1924 |
| Treloar | W. G. | Cockburn Sound Loc. 835, Byford | W3T and 80B, 23E | 1962 |
| Treloar | W. J. | Beda, Bridgetown | TZ1 | 1912 |
| Treloar | W. J. | Beda, Bridgetown | TZ1 | 1924 |
| Treloar | Wm. | Hillgrove, Katanning | N7T | 1924 |
| Treloar, McKinnon & Treloar | - | Victoria Locs. 98, 852, 1158, 115, 2071, Nanson, via Geraldton | X4L and 22B, 14E | 1962 |
| Tremain | K. | A.827C, Ongerup | 0KT and 113D, 33E | 1962 |
| Tremain & Co. | L. E. | Forest Glen, Bruswick Junction | 8LT and 15B, 107A | 1962 |
| Trembath | W. N. | Inglewood Farm, Kondinin | 2NT | 1924 |
| Trembath | Wm. | Meadows of Cornwall, Trafalgar | TV5 | 1924 |
| Tremlett | A. F. & E. M. | Hope Farm, Tammin | 4TA and 20B, 111A | 1962 |
| Tremlett | G. & B. | Orana, A705F, Winchester | 8GT and 31B, 111A | 1962 |
| Tremlett | W. E. | Tammin | W7T | 1912 |
