| Timbrell | C. Hy. | Roath Park, Balingup | X2T | 1924 |
| Timmins | E. | Avon 16016 and 21189, Clackline | ET3 and 27B, 67E | 1962 |
| Timmins | James | Ashburton, Onslow | 0TJ | 1924 |
| Timmins | Jas. | Ashburton, Onslow | 0TJ | 1912 |
| Timmins & Sons | F. J. | Avon 14467, Kulin | FT8 and 43D, 50E | 1962 |
| Timmis | J. S. C. | Kirk's Rock, Yealering | F1A and 7B, 19E | 1962 |
| Timms | Est. of the Late H. O. | Moyallen, Gnowangerup | 0HT and 14C, 30A | 1962 |
| Timms | F. | Reserve, Watheroo | QT8 | 1924 |
| Timms | F. J. B. | Carinya 12226 Kojonup, Qualeup | JT1 and 37D, 13E | 1962 |
| Timms | G. O. & N. L. | Dinninup Downs, Kojonup | 6GT and 33D, 105E | 1962 |
| Timms | H. O. | Glengarry, Broomehill | 0HT | 1912 |
| Timms | H. O. | Gengarry, Broome Hill | 0HT | 1924 |
| Timperley | D. A. | Hastings, Kukerin | 4PT and 11C, 7E | 1962 |
| Timperley | F. B. | Chiltern, Northam | FT4 | 1912 |
| Timperley | F. B. | Chiltern, Northam | FT4 | 1924 |
| Timperley | M. J. | Williams 9134-5, 14302, 7012-3, 8644-5, Kukerin | FK4 and 21B, 20E | 1962 |
| Timperley & Son | - | Hastings, Kukerin | 4PT | 1924 |
| Tindale | A. | Locs. 3120, 4655, 5523, Kent River, Denmark | A6T | 1962 |
| Tindale | D. O. & C. | Plantagenet 5736 | O5T and 7B, 19A | 1962 |
| Tindale | Jackson S. | Avon Locs. 22721 and 24662, Muckinbudin | Q0E | 1925 |
| Tindale | T. E. | 44 Gargill Street, Victoria Park | V9T | 1924 |
| Tindale & Coade | - | Lambton, East Narrogin | T8C | 1912 |
| Tindale & Coade | - | Lambton, East Narrogin | T8C | 1924 |
| Tink | G. F. | Wonnulla Homestead, Manjimup | F4T | 1962 |
| Tink | Wm. R. | Yarramony Siding | 4TX | 1924 |
| Tinker & Lindley | - | Cudnarra, Tammin | TL0 | 1912 |
| Tinker & Lindley | - | Cudnarra, Tammin | TL0 | 1924 |
| Tippet & Moir | C. L. & K. B. | 18157-8, 20509, 18151, 20147-8, Narembeen | T1L and 48B, 25E | 1962 |
| Tippet & Son | G. | Ynoo, Shackleton | T1P and 48D, 40E | 1962 |
| Tippett | Geo. | Laverton | TT7 | 1924 |
| Tippett | George | Laverton | TT7 | 1912 |
| Tippett | John | Common, P. O., Mt. Magnet | UT5 | 1924 |
| Tipton | P. T. | West View, Corrigin | 7PT and 10C, 67E | 1962 |
| Titchener | Frank S. | Avon Locs. 14538, Kukerin, via Bruce Rock | 5FT | 1924 |
| Titchener & Richards | - | Bilgading, Yarrmony, via Northam, North | 4KR | 1924 |
| Titley | J. A. | Lease 152202, Newcarnie | 6TK | 1924 |
| Titley | Owen Addison | Brunswick Estate, Brunswick Junction | A0T | 1926 |
| Titterton | F. A. S. & P. E. | 3095, Rosa Glen | YT2 and 80B, 114A | 1962 |
| Tobias | T. H. & E. R. | Caermanor Farm, Yorkrakine | E6T | 1924 |
| Todd | C. S. | Ditchin, Lake Needo Coorow | S5T | 1912 |
| Todd | C. S. | Ditchin, Lake Needo, Coorow | S5T | 1924 |
| Todd | Charles | Canning Loc. 2, Lots 262 and 263, York | DR4 | 1925 |
| Todd | E. (Mrs) | Forest View Farm, Rosa Glen, Margaret River | 6ET and 113B, 24A | 1962 |
| Todd | J. A. & E. M. | Wimmera, Dowerin | 9TX and 10C, 32E | 1962 |
| Todd | Jas. Richard | Big Karri, Denmark | TV4 | 1924 |
| Todd | Thos. B. | Koongawa, Wagin West | ZD8 | 1924 |
| Todd | Thos. John | Mali Brae, Nungarin | 0TU | 1924 |
| Todhunter | M. | Hillside, Margaret River | J8T | 1962 |
| Toesland | W. R. | Jibherding, Dalwallinu | U4D | 1924 |
| Tognela | D. | 296-270, 158, 274 1150, 484, Waroona | DT4 and 21B, 8A | 1962 |
