| Samson | Kate | Clayton, Bellevue, Rocklands, Yalgoo | KS1 | 1924 |
| Samson & Son | H. | Hillvista, Bedfordale | 6ON and 104D, 41E | 1962 |
| Samwell | J. L. | 2951, 2950, 2971, Kulikup | L7L and 3C, 17E | 1962 |
| Samwell | R. S. | Berengoon, Kulikup | V3S and 20C, 102E | 1962 |
| San Miguel | F. de | Hope Valley, Rockingham | FQ7 | 1924 |
| San Miguel | F. de | Lot 21, Bibra Lake | FQ7 and 5B, 15E | 1962 |
| Sandalwood Grazing Co. | - | Sandalwood, Borden | 9AM and 18B, 16E | 1962 |
| Sanday | K. W. | Sussex Lot 3980, Warner Glen, via Karridale | KS3 and 48D, 9E | 1962 |
| Sandberg | John E. | Marbellup | YS3 | 1924 |
| Sandells | S. W. | Roe Loc. 143, 514, 2080, 947, Lake Biddy | BS7 and 39B, 47A | 1962 |
| Sandells | Sydney W. | Locs. 129, 646, 546, Lake Biddy, Newdegate | BS7 | 1925 |
| Sandercock | J. A. & D. P. | Avon Loc. 18537, Bulyee | 9SJ and 46B, 10E | 1962 |
| Sandercock | T. H. | Morrockdong, East Brookton | TS3 | 1912 |
| Sandercock | T. H. | Morrockdong, East Brookton | TS3 | 1924 |
| Sanders | A. | Avoca, Dowerin | S9U and 43B, 11A | 1962 |
| Sanders | Andrew | Lots 19 and 98, Dowerin | S9U | 1924 |
| Sanders | G. I. | Harwick Farm, Wubin | 2GS and 21C, 102E | 1962 |
| Sanders | K. T. H. | 8705-6, Northcliffe | K7S | 1962 |
| Sanders | L. J. | Loc. 35, Esperance | 1LR and 41B, 28A | 1962 |
| Sanders | L. J. H. | Camden, Boyanup | 5SN and 30B, 35E | 1962 |
| Sanders | Lucy | Ora Banda | SU0 | 1924 |
| Sanders | R. M. & E. J. | Glenroy, Dowerin | 6RS and 33B, 38E | 1962 |
| Sanders | Richard S. | Ora Banda | 3YS | 1924 |
| Sanders | W. A. | Loc. 598, Esperance | SU0 and 109D, 118E | 1962 |
| Sanderson | F. M. | Bridgetown | VS9 | 1924 |
| Sanderson | Fred. | Oakdell, Pingelly | 8NV | 1924 |
| Sanderson | Frederick | Block 89, Newdegate, Newdegate | Q6S | 1925 |
| Sanderson | H. | 1904, 1946-7, 2562, 3893, Kalannie | HS9 and 10C, 39A | 1962 |
| Sanderson | H. L. | Loc. 415, Lesmurdie | 4SL | 1962 |
| Sanderson | J. E. | Nelson 12404, Northcliffe | S8J and 32D, 120E | 1962 |
| Sanderson | John W. | Fitzgerald Loc. 456, Salmon Gums | 6JS | 1928 |
| Sanderson & Sanderson | - | Ambleside, Kalannie | RS0 and 19C, 32E | 1962 |
| Sanderson & Son | J. W. | Fitzgerland Loc. 482, 484, 516, 514, 297, 233, 354-5, 616, Salmon Gums | 6JS and 47B, 22A | 1962 |
| Sandford | B. | Commonage, Southern Cross | B4S | 1912 |
| Sandford | B. | Southern Cross | B4S | 1924 |
| Sandilands | C. W. | Crysilla and Billandri, Kendenup | 0BD and 67B, 25A | 1962 |
| Sandilands | C.C. & E. S. | Crysilla, Kendenup | US8 and 17B, 80E | 1962 |
| Sandilands | J. B. | Balerno, Gabbin | 8BP | 1924 |
| Sandilands | P. & H. G. | Koorbardi and Balwarra, Kendenup | CS2 and 48D, 35E | 1962 |
| Sandilands | R. R. & D. | Kurramia, Kendenup | 3XS and 45E, 44D | 1962 |
| Sandilands & Co. | C. W. | Billandri, Kendenup | WS7 and 80B, 17A | 1962 |
| Sandland | P. A. | Wandena, Moora | SX7 and 32B, 24E | 1962 |
| Sandland | Philip T. | Burrabidjy, Moora | 4ZP | 1924 |
| Sandland | T. | Burrabidgy, Moora | SX7 | 1912 |
| Sandland | T. | Burrabidjy, Moora | SX7 | 1924 |
| Sandland & Co. | P. T. | Burrabidgy Station, Moora | 4ZP and 32D, 6E | 1962 |
| Sandon | R. A. | Kurrajong Farm, Nampup | S2X | 1912 |
| Sandon | R. A. | Kurrajong Farm, Nampup | S2X | 1924 |
| Sandover & Gillespie | - | Bowgarder, Mingenew | SG1 | 1912 |
| Sandover & Gillespie | - | Bowgarder, Minginew | SG1 | 1924 |
