| Sloan | N. H. & W. J. | Wellington Loc. 4099, Buckingham, Collie | SL2 and 16B, 84E | 1962 |
| Sloan | P. J. | Woodlands, Rockingham | P7S | 1912 |
| Sloan | P. J. | Woodlands, Rockingham | P7S | 1924 |
| Sloan | T. | Yeerakin 21930, 25906, Kondinin | SY2 and 12D, 107E | 1962 |
| Sloan | T. S. | 5937 Plantagenet, Youngs Siding | G7S and 13B, 30E | 1962 |
| Sloan | Theodore S. | The Woodlands, Cockburn Sound, Rockingham | G7S | 1927 |
| Slob | D. | Lewisham, Margaret River | 9LE and 113D, 116E | 1962 |
| Slocum | Henry | Cranleigh, Wyalcatchem | O3S | 1924 |
| Slocum | Oliver Gordon | Benjaberring Farm, Benjaberring | ⊚5S | 1926 |
| Slogett | T. F. | Williams Loc. 12192, Jitarning | Z5Y | 1924 |
| Sloggert | E. B. & O. M. | Red Hill, Kulia | E6B and 39D, 109E | 1962 |
| Sloggett | Geo. Hy. | Sunnyside Farm, 86 Mile Gate, Geetarning | 4SO | 1924 |
| Slopen | Henry E. | Homestead, Pingelly | H4S | 1912 |
| Slopen | Henry E. | Pingelly | H4S | 1924 |
| Sloper | Chas. | Irwin, Dongarra | CS4 | 1912 |
| Sloper | Chase. | Irwin, Dongarra | CS4 | 1924 |
| Sloper | Elizabeth | Dongarra | 6SO | 1924 |
| Sloper | Emily | Rose Cottage, Dongarra | 0SD | 1924 |
| Sloper | Walter | Sloper's Farm, Yandanooka | 9ZW | 1924 |
| Sloss | Joseph | 22035/55 and 11649/74, Doodlakine | SD6 | 1912 |
| Sloss | Joseph | 22035/55, 11649/74, Doodlakine | SD9 | 1924 |
| Sloss | Saml. | The Springs, Kellerberrin. 52 Bennett Street, East Perth | 7OS | 1912 |
| Sloss | Samuel | The Springs, Kellerberrin; 52 Bennett Street E. Perth | 7OS | 1924 |
| Sloss | Samuel, sen | Sunnyside, Doodlakine | ZS7 | 1924 |
| Sloss & Sons | M. & N. | Mt. Lookout, Narembeen | 2MS and 48B, 59F | 1962 |
| Sloss & Wainwright | O. & P. E. | Swan 1352, Northam | S3W and 109B, 18A | 1962 |
| Slotter | G.M. | Holland Street, Fremantle | 0KS | 1924 |
| Slow Learning Children's Group of W.A. (Inc) | - | Ulalli, Kalamunda Road, Maida Vale | UL7 and 17C, 28A | 1962 |
| Slowiak | F. | Fitzgerald loc. 166, Salmon Gums | FS5 and 7C, 30A | 1962 |
| Slyns | E. A. | Lewana, Balingup | 2SE and 27B, 118E | 1962 |
| Smailes | J. V. | Karragullen | 1RN | 1927 |
| Smailes | R. N. | Jennerberring, Quairading | 5RS | 1912 |
| Smailes | R. N. | Jennerberring, Quairading | 5RS | 1924 |
| Smailes | Sydney | Teamster, Pickering Brook | SL4 | 1912 |
| Smailes | Sydney | Pickering Brook | SL4 | 1924 |
| Smale & Son | W. A. | Williams 8476-7, 11690-1, 12436, Toolibin | WA5 and 67B, 37A | 1962 |
| Smales | E. A. | Homestead, Jennaberring | 3ES | 1912 |
| Smales | E. A. | Jennaberring | 3ES | 1924 |
| Small | Beatrice Mary | Willlow Grove Farm Ardath | FZ8 | 1924 |
| Small | Caleb | Sutton Park, Kellerberrin | C9S | 1912 |
| Small | Caleb | Sutton park, Kellerberrin | C9S | 1924 |
| Small | D. R. | Afton, Bindi Bindi | SC3 and 31B, 49E | 1962 |
| Small | Fredk. | Willow Grove Farm, Ardath | US8 | 1924 |
| Small | G. | Denbering, Tarwonga, Via Wagin | 0QD and 67B, 20E | 1962 |
| Small | George | Denberring, Tarwonga | 0QD | 1926 |
| Small | P. M. | Challymenda, Pindar | M1S and 41B, 20A | 1962 |
| Small | Peter McL. | Fitz. Loc. 198, Esperance | N6X | 1924 |
| Small | Thos. Henry | Jalamulup Farm, Needinlup | 3XS | 1924 |
| Small | W. M. | Sutton Milk, Babakin | WS3 and 9D, 50E | 1962 |
| Small | William | Willow Grove, Kirkenham | 8WS | 1912 |
