| Schramm | H. F. & J. F. | Howard's Hill, Brown Road, Dorakin | S9F | 1924 |
| Schroder | F. A. | Rosedale Farm, Dumbleyung | 8FS | 1912 |
| Schroder | F. A. | Rosedale Farm, Dumbleyung | 8FS | 1924 |
| Schroeder | Chas. | Murchison | CS2 | 1924 |
| Schruth | F. | Schruth's Farm, Serpentine | FS4 | 1912 |
| Schubert | Ernest G. I. | Wattle Pool Farm, Woodanilling | E1T | 1924 |
| Schubert | F. R. | Rocky View Farm, Bruce Rock | F6S and 17B, 29A | 1962 |
| Schubert | L. A. & D. J. | Windee, Gnowangerup | S1X and 16D, 37E | 1962 |
| Schultz | A. H. T. | Ewalymartup, via Katanning | Z9T | 1924 |
| Schultz | Arthur | Ilvira Downs, Hall's Creek | A7S | 1912 |
| Schultz | Arthur | Ilvira Downs, Hall's Creek | A7S | 1924 |
| Schultz | C. E. | Angel's Rest Fam, Arthur River | 0CS | 1912 |
| Schultz | C. E. | Angel's Rest Farm, Arthur River | 0CS | 1924 |
| Schultz | Geo. | Chincenmeir, Minnivale | 9US | 1924 |
| Schultz | J. W. | Yambella, Wickepin | SZ0 | 1912 |
| Schultz | J. W. | Yambell, Wickepin | SZ0 | 1924 |
| Schultz | P. H. | Rosebourne, Katanning | W2X and 37C, 22E | 1962 |
| Schultz | R. M. | Nelson Loc. 11632, Walpole | XS8 | 1962 |
| Schultz | V. T. | 46, 174, 161, 49, Katanning | Z9T and 29B, 47E | 1962 |
| Schultz & Son | W. T. & G. A. | 630, Esperance | 3WS and 6B, 108E | 1962 |
| Schulz | A. A. | Singleton, Narrogin | AS5 | 1912 |
| Schulz | A. A. | Singleton, Narrogin | AS5 | 1924 |
| Schulz | C. A. | Dorrington Farm, Kulyaling | CA4 | 1912 |
| Schulz | C. A. | Dorrington Farm, Kulyaling | CA4 | 1924 |
| Schulz | L. M. | Avonleigh, Kulyaling | CA4 and 8D, 30E | 1962 |
| Schulze | F. C. H. | Richmond, Wickepin | 9FS | 1912 |
| Schulze | F. C. H. | Richmond, Wickepin | 9FS | 1924 |
| Schulze | G. A. | Loc. 4920, Kojonup | GZ8 | 1924 |
| Schulze | O. & D. M. | 5416, 6413, 7714, 7128, Wubin | 7XY and 43C, 56F | 1962 |
| Schulze | R. | Wandanno, Wubin | PY5 and 44C, 30E | 1962 |
| Schulze | R. E. | 18812, 27317, 19780, Corrigin | 0SR and 13C, 120E | 1962 |
| Schulze | W. O. & G. I. | Avon, 20275-6, 22554, Koorda | 9WS and 53F, 48D | 1962 |
| Schulze Bros. | - | Vic. Loc. 5466, Wubin | 7XY | 1924 |
| Schunke | W. | Katanning | 9SW | 1912 |
| Schunke | W. | Katanning | 9SW | 1924 |
| Schuts | A. V. | Marridale, Rocky Gully, via Mt. Barker | A5V and 9B, 4A | 1962 |
| Schuttloffel | B. A. L. & D. J. | Sunhaven, Wongong, via Armadale | WE3 and 47D, 58F | 1962 |
| Schuttloffel | Est. Lt. L. | Quorn Vale, Bruce Rock | LS2 and 49B, 32A | 1962 |
| Schuttloffel | H. O. H. | Utopia, Tammin | 3SL | 1912 |
| Schuttloffel | H. O. H. | Utopia, Tammin | 3SL | 1924 |
| Schutze Bros. | - | Gnangara Estate | 2ZZ | 1912 |
| Schutze, Bros. | - | Gnangara Estate, Wanneroo | 2ZZ | 1924 |
| Schwartz | H. A. | Sandal Downs, Bruce Rock | D9S | 1924 |
| Schwartz | T. H. | Avon 19310-12, Sawyers Valley | 1TS and 41B, 20E | 1962 |
| Scofield | Amy | Avon Loc. 19133, Totadgin | Y4F | 1924 |
| Scolari | F. | Mont Rosa, Mumballup | FS6 and 7C, 19E | 1962 |
| Scolari & Sons | G. | 3713, Noggerup | SB3 and 7D, 28E | 1962 |
| Scotch College | - | Scotch College, Claremont | XO1 | 1924 |
| Scotch College | - | Swanbourne, Swanbourne | XO1 | 1962 |
| Scothron | John | Williams Loc. 10694, Jinarin, via Dumbleyung | JZ8 | 1924 |
