| Jarvis | Joseph | 120 Sewell Street, East Fremantle | 5AJ | 1912 |
| Jarvis | Joseph | 120 Sewell Street, E. Fremantle | 5AJ | 1924 |
| Jarvis | L. E. | Block 6608, 23335, Burracoppin | 7J4 and 30A, 48B | 1962 |
| Jarvis | L.E. | Block 6608, Burracoppin. | LJ4 | 1912 |
| Jarvis | L.E. | Block 6608, Burracoppin | LJ4 | 1924 |
| Jarvis | W. E. | Loc. 7360, Wedin | 9VJ | 1924 |
| Jarvis & Son | Henry | 30 Acres, Harvey | QV7 | 1925 |
| Jasper | A. & E. | Leithdale, Cunderdin | J2J | 1912 |
| Jasper | A. J. (jnr.) | Glenroe, Cunderdin | 5AJ and 28B, 5E | 1962 |
| Jasper | C. D. | Timaru, Cunderdin | XC7 and 44A, 45B | 1962 |
| Jasper | C. M. | Fairview, Cunderdin | AJ1 and 31E, 27D | 1962 |
| Jasper | E. | Norward Farm, Cunderdin | J2J | 1924 |
| Jasper | G. S. | Loc. 7523, Cunderdin | OJ5 | 1924 |
| Jasper | H. A. | Fairview, Cunderdin | XH1 and 35A, 45C | 1962 |
| Jasper | N. A. | Ploverdale, Cunderdin | P3J and 39E, 19B | 1962 |
| Jasper | S. H. W. | Prospect Farm, Cunderdin | 7JQ and 6B, 9E | 1962 |
| Jasper | Samuel | Glen Hartley, Swan Lagoon, via Norseman | KV8 | 1925 |
| Jasper | T. W. | Prospect Farm, Cunderdin | 7JQ | 1924 |
| Jasper & Son | E. R. | Wyola, Cunderdin | OJ5 and 119D, 39E | 1962 |
| Jasper & Son | G. E. | Norwood, Cunderdin | G4J and 12B, 104A | 1962 |
| Jaurdi Station | - | Juardi Station, Boorabbin | KP6 and 43D, 107E | 1962 |
| Javens | A. & V. W. | Eriswell & Kenilworth, Upper Blackwood, via Kojonup | V3J | 1912 |
| Javens | A. & V. W. | Eriswell & Kenilworth, Upper Blackwood, via Kojonup | V3J | 1924 |
| Javens | David | Scott's Brook, Bridgetown | A4Z | 1924 |
| Javens | H. P. | Nelson Loc. 7963, Kulikup | 2YP | 1924 |
| Jay | Hubert Frank | Sleepy Hollow, Yanmah, Manjimup | H1J | 1928 |
| Jay | J. W. R. | Locs. 8881-7-8, Northcliffe | J7Y | 1962 |
| Jay | Mrs A. | Yeediboolja, Youanme | Q0J | 1924 |
| Jay Bros. | - | Yorbu, Pigeon Rocks via Mt. Jackson | JY0 | 1912 |
| Jay Bros. | - | Yorbu, Pigeon Rocks, via Mt. Jackson | JY0 | 1924 |
| Jeanes | Mrs C. C. | Lockyer avenue, West Northam | LN9 | 1924 |
| Jebarjup Pastoral Co. | - | Nukenullup and Jebarjup, Mt. Barker and Cranbrook | JP6 and 54F, 10D | 1962 |
| Jebb | A. | Avon Loc. 16971-7, Muntadgin | EJ4 and 3D, 48E | 1962 |
| Jecks | Alfred | Block 10, Panoramic Estate, Kalamunda | UJ1 | 1912 |
| Jecks | Alfred | Block 10, Panoramic Estate, Kalamunda | UJ1 | 1924 |
| Jecks | S. D. | Lot 123, Hazelmere | SJ9 | 1962 |
| Jeedamya Pastoral Co. | - | Jeedamya Station, Jeedayma Siding, Kalgoorlie | EA2 and 24E, 14B | 1962 |
| Jeeks | William | Swan Loc. 9, Maida Vale | 5YJ | 1924 |
| Jefferies | A. G. & E. M. | The Morrells, Woodanilling | 9JF and 19D, 55F | 1962 |
| Jefferies | A. L. & L. | 8731 Victoria Loc., Watheroo | A3J and 103A, 2C | 1962 |
| Jefferies | G. L. | Homestead, Katanning | 9JF | 1912 |
| Jefferies | G. L. | Homestead, Katanning | 9JF | 1924 |
| Jefferies | J. C. | Warrah, Wagin | 8JU and 115A, 47B | 1962 |
| Jefferies | J. J. | Bakers Wells, Northampton | JY1 | 1962 |
| Jefferies | N. C. | Hay Locs. 1005, 850, 616, Tenderden | Z3J and 25B, 32E | 1962 |
| Jefferies | W. H. & M. L. | Warrah, Latham' Siding | Z7J | 1924 |
| Jefferies & Co. | V. E. & M. E. | Treetops, Waroona | BZ6 and 84C, 4A | 1962 |
| Jefferies & Coppin | Jno. & C. W. & H. C. J. | Lalla Rook, via Pt. Hedland | E7O | 1924 |
| Jefferson | George | Yongerup, Mt. Many Peaks, View Street, Albany | Z7Q | 1925 |
| Jefferson | J. H. | Nourning Spring, Brookton | 0JJ and 57F, 24B | 1962 |
