| Short | John T. jun. | Tutanning Springs, Pingelly | 5JS | 1912 |
| Short | R. F. & C. M. | Springton, Narrogin | LH1 and 23D, 39E | 1962 |
| Short | W. E. | Williams 3068 and 3050, Williams | E4S and 14B, 50E | 1962 |
| Short | W. G. | Mallina, Peak Hill | VF7 | 1912 |
| Short | W. G. | Mallina, Peak Hill | VF7 | 1924 |
| Short | W. R. | Invermay, Yilliminning | 6ES and 12C, 30A | 1962 |
| Short & Sons | E. R. | Mt Fairfax via Geraldton | 0SS and 22C, 48E | 1962 |
| Shorter | Albert Stanley | Gascoyne Locs. 112 and 113, Carnarvon Post Office | 1WT | 1926 |
| Shorthouse | Arthur | Nganga Batta, Bendering | S3V | 1924 |
| Shorthouse | Bert. J. | Donnelly River Loc. 5644, Nelson, Manjimup | 0XS | 1924 |
| Shortland | R. G. | Sussex 2480-90, Karridale | SZ7 | 1962 |
| Shortt & Kennedy | - | Lochinvale Stn., Marble Bar | V9R | 1924 |
| Shotter | H. W. | Upfields, Walpole | U7S | 1962 |
| Shreeve | A. | Blocks 4662, 4663, Northampton | 3SA | 1912 |
| Shreeve | A. | Blocks 4662-3, Northampton | 3SA | 1924 |
| Shreeve | A. J. & D. G. | Block 111, Canningvale | AS9 and 43B, 67E | 1962 |
| Shreeve | A. R. | Lloydville, Quairading | 0AR | 1912 |
| Shreeve | A. R. | Lloydville, Quairading | 0AR | 1924 |
| Shreeve | R. C. | Jilbadji Loc. Nos 7 and 1691 Yilgarn Loc. 35, Merredin | 1CS and 84E, 28D | 1962 |
| Shreeve | Richard | Hillside Farm, Williams | 9ZR | 1924 |
| Shugg | H. G. | Newlyn, Benjaberring | HG4 | 1912 |
| Shugg | H. G. | Newlin, Benjabbering | HG4 | 1924 |
| Shure | John James | Jubilee Downs, Fitzroy | UZ9 | 1926 |
| Siano | - | Marble Bar | ES2 | 1912 |
| Siano | - | Marble Bar | ES2 | 1924 |
| Sibbald | Ann | Block 1060, Plantagenet Area, Torbay | A9N | 1912 |
| Sibbald | Ann | Plantagenet Area Block 1060, Torbay | A9N | 1924 |
| Sibbald | John | Jibberding, Gunyidi | J0X | 1912 |
| Sibbey | Louis | Homestead, Pingelly | L2S | 1912 |
| Sibbey | Louis | Pingelly | L2S | 1924 |
| Sibley | A. J. | Wattle Grove, Yealering | K5Z and 84B, 16E | 1962 |
| Sibley | Gordon S. | Nelson Locs. 5100 and 9532, Maujimup | G4S | 1926 |
| Sibley | Helen | Wattle Grove, Stretton | KS7 | 1924 |
| Sibley | Walter W. | Sunnyside Farm, Stretton | UY5 | 1924 |
| Siddins | O. T. & J. C. | Waidurrio, Wyndham | O6Z | 1924 |
| Side | Henry H. | Oaklands, Toodyay | Z9D | 1924 |
| Sidebottom | A. (Mrs) | Sussex Loc. 681, Yoongarilup via Bussleton | SY0 | 1962 |
| Sidebottom | J. W. | Sussex Loc. 3862, Karridale | 0SJ | 1962 |
| Sidebottom | J. W. | Brookside Dairy, Bussleton | J2S and 67D, 7E | 1962 |
| Sides | S. L. & E. J. | Inglewood, Northam | W6G and 40B, 120A | 1962 |
| Sidong | - | Ethel Creek, Nullagine | S1D | 1912 |
| Sidong | - | Ethel Creek, Nullagine | S1D | 1924 |
| Sieber | L. H. | Kasvin, Narrogin | S4Z and 32C, 84A | 1962 |
| Sieber | T. (Mrs) | Weslington, Balingup | U3Z and 32C, 105A | 1962 |
| Siefken | Arthur | Barton | QZ9 | 1924 |
| Siegert & Co | N. & R. | 24934, 15423-4, Wongan Hills | E6S and 10B, 113A | 1962 |
| Sier | A. J. & E. G. | Ankuri, South Quairading | 1KQ | 1925 |
| Siford | Luke | Pipe Clay Garden, Jarrahdale | Y0S | 1924 |
| Siggins | E. C. | S. Burracoppin | 8ZE | 1924 |
| Siggs | Caleb Henry | Glenmore, Waterloo | QA0 | 1924 |
