| Duckworth | A. R. & J. M. | Glen Orrin, Harrismith | 2JF and 45E, 23D | 1962 |
| Duckworth | E. K. | Edwin, Lake Grace | 7KD and 45C, 103E | 1962 |
| Duckworth | Edward | Williams Loc. 9516, Lake Grace | D8U | 1924 |
| Duckworth | G. | Allanlea, Lake Grace | 1GD and 118A, 15B | 1962 |
| Duckworth | J. | Ultra- Vires, Lake Grace | D8U and 46D, 17E | 1962 |
| Dudley | A. E. | Darlington, Malabaine, via Northam | ED2 | 1912 |
| Dudley | A. E. | Darlington, Malabaine, via Northam | ED2 | 1924 |
| Dudley | A. E. R. | Darlington, Northam | ED2 and 5D, 57F | 1962 |
| Dudley | D. J. | Mount Joy, Jennapullen | 0YD | 1924 |
| Dudley | G. T. | 4261, Kentdale, Denmark | CU2 and 38C, 10E | 1962 |
| Dudley | H. | Plant. 2417, Kentdale, Denmark | YP5 and 20A, 110B | 1962 |
| Dudley | K. P. | Glen Field, Northam | KD2 and 17A, 40B | 1962 |
| Dudley | Richard | Rock Park, Northam | RD2 | 1924 |
| Dudley | Richd. | Rock Park, Northam | RD2 | 1912 |
| Dudley | Wm. | Glenfield, Southern Brook, via Dowerin | 1ZD | 1924 |
| Dudley & Sons | T. V. | Sussex 2121-2, 2301-6, and 2308, Ambergate | TD7 and 12D, 106E | 1962 |
| Duerden | G. | Bundarra, Northcliffe | 1GD and 48B, 113E | 1962 |
| Dufall | L. G. | Midland Abattoirs, Midland Junction | 5OX | 1924 |
| Duff | A. J. | Glen Echo, Kendenup | AJ2 and 104B, 18A | 1962 |
| Duff | A.W. & B. | Cheeryna, Williams | 0DW and 33D, 46E | 1962 |
| Duff | D. H. | Lock Ellen, Kendenup | W3W | 1928 |
| Duff | D. H. | Lock Ellen, Kendenup | W3W and 7D, 25E | 1962 |
| Duff | T. | Bacton, Mingenew | 8DX and 3C, 12A | 1962 |
| Duff | Thomas | Palin Hill, Pemberton | TD1 | 1926 |
| Duff | Thos. | Block 15212, Merredin | 4TD | 1912 |
| Duff | Thos. | Block 15212, Merridan | 4TD | 1924 |
| Duff | Thos. | Strathmore Yandanooka | 8DX | 1924 |
| Duff & Sons | John | Hillside Farm, Lower Warren, Manjimup | Z1N | 1924 |
| Duffield | A. A. | Devauden Farm, Muchea | 6AA and 43B, 117E | 1962 |
| Duffield | A. H. | Avon 13997, 20450-1, Burracoppin | 1AD and 48B, 8E | 1962 |
| Duffield | E. K. | Wellington 1594-5, 2578-9, Darkan | KK3 and 106D, 47E | 1962 |
| Duffield | H. F. | Wynolma, East Narrogin | 4DW | 1924 |
| Duffield | S. | Glenmoy, Darkan | SD7 and 26B, 52F | 1962 |
| Duffield Bros. | - | Rivermead, Manjimup | UD2 | 1924 |
| Duffy | Edward | Bulleanna Springs, Peak Hill | E1D | 1912 |
| Duffy | Edward | Bulleanna Springs, Peak Hill | E1D | 1924 |
| Duffy | Ernest | Balcatta, Wanneroo | ED7 | 1924 |
| Duffy | Eva | Lillydale, Wanneroo | E1D | 1927 |
| Duffy | F. J. | Location 110, Wanneroo | FD1 | 1912 |
| Duffy | F. J. | Location 110, Wanneroo | FD1 | 1924 |
| Duffy | H. | Perthshire Loc. 103, Lot 25, Wanneroo | 5DU and 84B, 11E | 1962 |
| Duffy | J. B. | Market Gardener, Wanneroo | D3Y | 1912 |
| Duffy | J. B. | Market Gardiner, Wanneroo | D3Y | 1924 |
| Duffy | K. J. | St. Gerards, Bruce Rock | K4D and 32B, 84E | 1962 |
| Duffy | Leo N. | P. O., Bullfinch | LD0 | 1927 |
| Duffy & Sons | C. E. | Loc. 103, Wanneroo | 7XD and 102B, 67A | 1962 |
| Dufly | A. D. | Rocky Glen, Duranillin | 4DD and 31B, 33E | 1962 |
| Dugdale | A. E. | C. P. 24603, H.F. 13417/74, Nangeenan | DG3 | 1912 |
| Dugdale | A. E. | H.F. 13417/74, Nangeenan | DG3 | 1924 |
| Dugdale | J. N. | Locs. 11131, 11144-5, Nungarin | J07 and 34C, 46E | 1962 |
