| Trigg | A. H. & M. | Youngs 5187, Torbay 125, Bornholm, via Albany | A2T and 48B, 45E | 1962 |
| Trigg | Arthur T. | Kalbyamba, Cannington | AT6 | 1928 |
| Trigg | Frank | Adsett Park, Kwollyinn | F8T | 1912 |
| Trigg | Frank | Adsett Park, Kwolyin | F8T | 1924 |
| Trigwell | A. R | Haddleton, Dinninup | 3AT and 47D, 50E | 1962 |
| Trigwell | Alf | Lansdale, Donnybrook | 7AT | 1912 |
| Trigwell | Alf. | Landsdale, Donnybrook | 7AT | 1924 |
| Trigwell | Arthur | The Springs, Boyanup | ZT2 | 1924 |
| Trigwell | Arthur Thos. | Commonage, Bunbury | Y3T | 1924 |
| Trigwell | B. | Palmdale, Donnybrook | B1T | 1912 |
| Trigwell | B. | Palmdale, Donnybrook | R1T | 1924 |
| Trigwell | B. A. | Wellington Loc. 2239, Boyamup | ZT2 and 116B, 112A | 1962 |
| Trigwell | C. (Mrs) | 550, 245, Port 36, Donnybrook | WT4 | 1962 |
| Trigwell | C. R. | The Range, Donnybrook | CT1 | 1912 |
| Trigwell | C. R. | The Range, Donnybrook | CT1 | 1924 |
| Trigwell | C. W. | 3298, 2750, 3192, 3375, 269, Donnybrook | T9M and 11C, 32E | 1962 |
| Trigwell | E. P. & L. F. | Boedup, Boyanup | 5EP | 1912 |
| Trigwell | E. P. & L. F. | Boedup, Boyanup | 5EP | 1924 |
| Trigwell | E. W. M. | Brentwood, Donnybrook | K4Q and 54F, 104D | 1962 |
| Trigwell | G. (exrs. of) | Ferndale, Preston | GT8 | 1924 |
| Trigwell | Jesse A. | Landsdale, Donnybrook | JT1 | 1927 |
| Trigwell | L. F. | Millside, Donnybrook | L9T and 8B, 108A | 1962 |
| Trigwell | P. D. | Sussex 2541-2, Metricup | P5T and 103B, 71E | 1962 |
| Trigwell | R. E. | Palmdale, Donnybrook | B1T | 1962 |
| Trigwell | R. W. | Loc. 3750, Dinninup | V1T and 10C, 56F | 1962 |
| Trigwell | S. S. | Palmdale, Donnybrook | ST7 | 1912 |
| Trigwell | S. S. | Palmdale, Donnybrook | ST7 | 1924 |
| Trigwell | S. S. | Palmdale, Donnybrook | ST7 and 8B, 25A | 1962 |
| Trigwell | T. A. | Reinscourt Farm, Busselton | NV5 | 1924 |
| Trigwell | T. C. | Stenelees, Boyanup | 3TO and 26D, 16E | 1962 |
| Trigwell | T. C. | Glen View, Boyanup | T5T and 21B, 21A | 1962 |
| Trigwell | T. F. | Brooklyns, Donnybrook | T9M | 1912 |
| Trigwell | T. P. | Brooklyns, Donnybrook | T9M | 1924 |
| Trigwell | Thos. | Lilydale, Boyanup | 3TO | 1924 |
| Trigwell | W. E. | 3452, 2438, 2449, Dinniup | 1ET and 6B, 71E | 1962 |
| Trigwell | W. J. R. | Glenely, Dinninup | 7JT and 47B, 45E | 1962 |
| Trigwell | W. W. | Lucknow, Deningup | V1T | 1912 |
| Trigwell | W. W. | Lucknow, Deningup | V1T | 1924 |
| Trigwell | Wm. Jas. | Barcombe Valley Farm, Gnowangerup | XT8 | 1924 |
| Trigwell & Sons | R. J. | Landsdale, Donnybrook | 7AT and 19D, 18E | 1962 |
| Trigwell Bros | - | Glenramsay and Lillydale, Boyamup | 0TX and 6C, 84A | 1962 |
| Trimble | M. | Swan 1317 Lot 91, Mt. Helena | M9T and 37C, 108E | 1962 |
| Trimble | N. | Sumerset Valley, Mt. Helena | YG6 and 84B, 84A | 1962 |
| Trimming | Alfred | Woodnote, Tambellup | A5T | 1927 |
| Trimming | W. | Woodlands, Woodanilling | TJ4 | 1912 |
| Trimming | W. | Woodlands, Woodanilling | TJ4 | 1924 |
| Trindall | A. M. S | Bristol Farm, Minnievale via Dowerin | A2T | 1912 |
| Trindall | A. M. S. | Bristol Farm, Minnivale, via Dowerin | A2T | 1924 |
| Trindall | E. R. | Bristol Farm, Minnievale via Dowerin | E9T | 1912 |
| Trindall | E. R. | Bristol Farm, Minnivale | E9T | 1924 |
