| Jefferson | J. S. | Sunny Hill, Mullalyup | J8J | 1912 |
| Jefferson | J. S. | Sunny Hill, Mullalyup | J8J | 1924 |
| Jeffery | A. E. | Block 77, Stephen Street, Queen's Park | 4PJ | 1912 |
| Jeffery | Albert | Hazeldene, Tambellup | Q2J | 1924 |
| Jeffery | James | Yarranup, Kojonup | 0JJ | 1912 |
| Jeffery | James | Yarranup, Kojonup | 0JJ | 1924 |
| Jeffery | James | The Downs Farm, South Yuna | Z0J | 1924 |
| Jeffery | James | Gisborne Park, Wagin | A2W | 1925 |
| Jeffery | Jas. H. | Stratham, Donnybrook | J9Y | 1924 |
| Jeffery | R. | Springdale Farm, Boundain, Narrogin | 8GQ | 1927 |
| Jeffery | Wm. | Marranup, Kojonup | FJ3 | 1912 |
| Jeffery | Wm. | Marranup, Kojonup | FJ3 | 1924 |
| Jefferyes | Eustace | The Glen, Allanson, via Collie | EY4 | 1924 |
| Jefferys | J. E. | Newlands, Walgooian | 4EJ and 119A, 19B | 1962 |
| Jeffree | C. E. | Faraway, Kellerberrin | CJ1 and 71D, 120E | 1962 |
| Jeffrey | A. E. | Block 77, Stephen Street, Queen's Park | 4PJ | 1924 |
| Jeffrey | Chas. | Diorite King via Leonora | C2J | 1912 |
| Jeffrey | Chas. | Diorite King, Leonora | C2J | 1924 |
| Jeffrey | Est. of J. H. | Stratham, Doonybrook | J9Y | 1962 |
| Jeffrey | G. L. | Yallambee Loc. 16899, 17612, Bilbarin | P7P and 32C, 34E | 1962 |
| Jeffrey | H. B. | Iona (Block 203, 255), Thomsons Brook | 8HJ and 9B, 40E | 1962 |
| Jeffrey | J. A. | Rockville, Kudardup | J6V | 1962 |
| Jeffrey | J. V. | Runnymeade, East Pingelly | S1P and 11B, 55F | 1962 |
| Jeffrey | M. R. & A. F. | Victory Valley, Yuna | Z0J and 39D, 27E | 1962 |
| Jeffrey | W. L. & O. N. | Rocky Rise, Victoria Loc. 9464 & 9898, East Yuna | W4J and 26D, 10E | 1962 |
| Jeffrey & Co. | F. | Trretops, Waroona | BZ6 and 84C, 4A | 1962 |
| Jeffrey & Sons | - | Newleyine, Northam | P7P | 1924 |
| Jeffrey Bros. | - | Bosulval Grange, Wagin, East | 2JV | 1912 |
| Jeffrey Bros. | - | Bosulval Grange, Wagin East | 2JV | 1924 |
| Jeffrey Bros. | - | Stockdale, Fremantle | J1Y | 1962 |
| Jeffreys | G. G. | 1007 Spion-Kop, Toodyay | G9J and 50B, 17E | 1962 |
| Jeffries | G. F. | Summee Valley, Koojan | 4JV and 33D, 102E | 1962 |
| Jeffries | J. E. | Enfield Farm, Kununoppin | 3UJ | 1924 |
| Jeffries | J. E. | Loc. 11368-1, Kununoppin | 3UJ | 1962 |
| Jeffries | L. B. | Avon Loc. 11371-61, 14429-30, 13937, Kununoppin | JE1 and 42D, 28E | 1962 |
| Jeffries | M. J. | Carthews, Langs-fords, Lampards, Kununoppin | JU7 and 12A, 114E | 1962 |
| Jeffries | W. | Alwynne, Balbarrup | 9JY | 1912 |
| Jeffries & Co. | W. E | Mount View, Bencubbin | JX1 and 119E, 38D | 1962 |
| Jeffs | G. H. | Maryland, Jingalup | SR6 and 12D, 114E | 1962 |
| Jeitz | H. W. & E. C. | 1444, 1035, Esperance | 9JH and 15B, 3E | 1962 |
| Jellard | Peter | P.O. Carnarvon | E1J | 1927 |
| Jenaway | S. J. | 112 and 525 Jandakot A. A. Ptn., Canningvale | SJ6 and 45C, 116A | 1962 |
| Jenholm Grazing Co. | - | Wogarno Station, Mt Magnet | JN3 and 14C, 25A | 1962 |
| Jenkin | A. | Brynterion, Highbury | EJ9 and 35B, 10E | 1962 |
| Jenkin | C. D. | 9405, 4013 Sussex, Karridale | 0DJ and 8B, 115E | 1962 |
| Jenkin | C. J. McM | 1861-2, 2347, 3077, 1508, Wongan Hills | OJ7 and 35A, 44C | 1962 |
| Jenkin | J. T. E. | Elsward, Noggerup | 3KN and 39A, 19C | 1962 |
| Jenkin | James Chas. | Beaufort, Katanning | 7NO | 1924 |
| Jenkin | S. H. | Broomehill | SJ4 | 1912 |
| Jenkin | S. H. | Broomehill | SJ4 | 1924 |
