| Antonio | T. J. & J. C. | Myrtle Grove Farm, Katanning | A2B | 1912 |
| Antonio | T. J. & J. C. | Myrtle Grove Farm, Katanning | A2B | 1924 |
| Antonio | Thos. J. | Brooklyn Farm, Southern Brook | 5BT | 1926 |
| Antonio & Co. | B. G. | Lakeview, Three Springs | 1ZN and 1C, 113A | 1962 |
| Antonio & Co. | J. C. | Loma Langi, Katanning | A2B and 16C, 15A | 1962 |
| Antonio & Co. | J. T. | Greenwoods, Meckering | 4WH and 20C, 35A | 1962 |
| Antonio & Sons | R. V. | Brooklyn Farm, Southern Brook | 5BT and 31B, 17A | 1962 |
| Antony | R. F. & E. R. | Habbies Howe, Meckering | 6FA | 1924 |
| Antwis | N. W & B. J. | Millinup, Narakup | ZA6 and 44C, 21A | 1962 |
| Anwar | Kaked | Anwar, Meenaar | A3A | 1924 |
| Anwar Kaked | - | Anwar, Meenaar | A3A | 1912 |
| Apenes | Erling O. | Seaforth, P.O. Box 63, Katanning | E0A | 1928 |
| Appleford | A. H. | Shotts, via Collie | 3YF | 1924 |
| Applegate & Co | R. | Ning. Loc 1700 1708, 1711, Cadoux | RA6, and 44B, 28E | 1962 |
| Appleton | Bertram | Arcadia, Wellington Mills | BA1 | 1928 |
| Appleton | E. C. | Kordinup Farm, Cape Riche | K0A | 1924 |
| Appleton | Thomas | Sans Souci, Popanyinning | T8A | 1924 |
| Appleton & Co. | - | Wyuna Estate, Wagin | NA7 | 1924 |
| Appleton & Wray | - | Burdett, Dangin | 2WA | 1912 |
| Appleton & Wray | - | Burdett, Dangin | 2WA | 1924 |
| Appleyard | G. M. | Wiaraway, Kununoppin | 4XA, and 26B, 80A | 1962 |
| Appleyard | M. H. | Kununoppin | 4XA | 1924 |
| Appleyard | T. J. & G. N. | Gimlet Valley, Kununoppin | T7A | 1924 |
| Applin | T. | Koj. Loc. 138 Katanning | A4V and 19B, 108E | 1962 |
| Applin | V. P. | Monks Green Stud, Katanning | TA5 | 1962 |
| Applin Bros. | - | Loc 33104/55 & 33233/55, Nyabing | 9VB | 1924 |
| Arber | Geo. | Boyup, Mt. Barker | AL3 | 1912 |
| Arber | George | Boyup, Mount Barker | AL3 | 1924 |
| Arber | George | Boyup Estate, Mount Barker | VA4 | 1924 |
| Arber | Preedena | Boyup and Combellup, Mt. Barker | P1A | 1912 |
| Arber | Preedena | Boyup & Combellup, Mount Barker | P1A | 1924 |
| Arbery | Walter Wm. | Victoria Loc 7601, Buntine | XA2 | 1924 |
| Arbuckle | Alfred | The Pines, Dalwallinu | A0U | 1924 |
| Arbuckle | H. L. | The Pines, Dalwallinu | A0U and 6D, 28E | 1962 |
| Arbuckle | J. H. | Lot 88, Balcatta | 7KC | 1962 |
| Arbuthnot | Henry | Montrose, Malyalling, via Wickepin | KA9 | 1924 |
| Arbuthnot & Son | J. W. & J. P. | Nelson 12395 12150, Tone River Mill, via Manjimup | 2JO and 108D, 31E | 1962 |
| Archer | C. T. | Wattle Farm, Tenterden | TA8 | 1924 |
| Archer | Ed | The Bungalow, Harvey | E7A | 1912 |
| Archer | Ed. | The Bungalow, Harvey | E7A | 1924 |
| Archer | Henry Douglas | Kwobrup, Katanning | U5K | 1924 |
| Archer | J. | 90381, Manjimup | H7F | 1962 |
| Archer | J. A. | Melb. 1068, Dalwallinu | L2Z and 106B, 45A | 1962 |
| Archer | J. W. | Loc 3103, Manjimup | V3O | 1924 |
| Archer | L. | Nelson Loc. 7074, manjimup | 6LA | 1962 |
| Archer | Lionel R. | Caljardup Park, Caves Road, Margaret River | KU7 | 1925 |
| Archer | T. C. | Highgate, Tenterden | TA8 and 11C, 115A | 1962 |
| Archer | Thos. | Laurivell Farm, Dardanup | TU8 | 1924 |
| Archer | W. | Derry Downs, Manjimup | V3O and 16D, 32E | 1962 |
| Archer | W. J. | Clearview, Tenterden | WA1 and 37B, 28A | 1962 |
