| Sisters of Mercy | - | Convent, Victoria Square | CV1 | 1912 |
| Sisters of Mercy | - | Convent, Victoria Square, Perth | CV1 | 1924 |
| Sisters of Nazareth | - | Nazareth House, Geraldton | NH4 | 1962 |
| Siviour | C. F. | Kent 1535, Gairdner River, Jerramungup | CF3 and 107D, 13E | 1962 |
| Siviour | D. & E. | Avreno, Bindi Bindi | D7S and 5B, 108A | 1962 |
| Sizmur | George | Ninghan Lots 1425 & 1430 Ballidu | Z9R | 1924 |
| Skahill | J. | Homestead, East Pingelly | S4O | 1912 |
| Skahill | J. | East Pingelly | S4O | 1924 |
| Skeen | D. & F. | Bollara Loc. File 179/32, Halls Creek | 1SK and 34C, 7E | 1962 |
| Skeen | Estate of J. | Sophie Downs, Halls Creek | WY4 and 80B, 22E | 1962 |
| Skeen | John | Commonage, Hall's Creek | X5A | 1924 |
| Skeet | John W. T. | Croham Hurst, Group 19, Lanark, via Manjimup | 6UQ | 1925 |
| Skeet | Mrs L. M. | Lake View, Forestdale | SU6 | 1924 |
| Skeggs | F. W. | Roselea, 2901, Rosa Brook | YF7 | 1962 |
| Skehan | Emily E. | Jarrahwood | 5EZ | 1924 |
| Skehan | Thos. | Jarrahwood | S8U | 1924 |
| Skelton | Chas. | Rendezvous, 14-Mile Brook | 8SC | 1912 |
| Skelton | Chas. | Rendezvous, 14 Mile Brook | 8SC | 1924 |
| Skene | Alex. E. | Khu, E. Narrogin | 7SA | 1924 |
| Sketchley | J. D. | Scotland 's Farm,Mt. Marshall | 8DS | 1924 |
| Skett | J. & M. M. | Dankton, Tardun | MS6 and 56F, 48E | 1962 |
| Skewes | J. F. | Carn Brea, Kellerberrin | FS6 | 1912 |
| Skewes | J. F. | Carn Brea, Kellerberrin | FS6 | 1924 |
| Skewes | W. H. | Locations 1807 and 1683, Narrogin | WS3 | 1912 |
| Skewes | W. H. | Locs. 1807 & 1683, Narrogin | WS3 | 1924 |
| Skidmore | R. W. | Springvale, Coolup | JY2 and 71C, 12E | 1962 |
| Skilling | G. H. | 1741-2, 1737, Yericoin | G8S and 28B, 17A | 1962 |
| Skilling | S. | Hamel | 6SS | 1912 |
| Skilling | S. | Hamel | 6SS | 1924 |
| Skinn | N. E. | Harvey A.A. Lot 197, Wagerup | 3NS | 1962 |
| Skinner | Alice Lilian | Six Mile, near Wyndham | 3SK | 1924 |
| Skinner | E. G. & R. C. | Swan Loc.1371, Kalannie | E3S and 22B, 34E | 1962 |
| Skinner | E. L. | Senic View, 1085, Mt. Barker | M5V and 27B, 113A | 1962 |
| Skinner | Fred K. John | Hayes Villa' Boyup | K6S | 1924 |
| Skinner | J. C. | Trangie Farm, Serpentine | 9SK and 29D, 67E | 1962 |
| Skinner | J. R. | Lemnos, Kalanmunda | RX5 | 1924 |
| Skinner | S. | 2906, 2925, Langlea Rosa Brook | YK8 | 1962 |
| Skinner | T. | Athleston Farm, Carbarup | S3K | 1924 |
| Skinner | V. | Athelston Farm, Carbarup | S3K and 37B, 24A | 1962 |
| Skinner & Johnson | - | Wyndham, Wyndham | M7S | 1912 |
| Skinner & Johnson | - | Wyndham | M7S | 1924 |
| Skipper | David | Blocks 6839/56, 6960/56, 13388/74, Cunderdin | 5DS | 1912 |
| Skipper | David | 6839/56, 6960/56, 13388/74, Cunderdin | 5DS | 1924 |
| Skipper | Geo. Win. | 52 Coolgardie Street,Subiaco | S4Z | 1924 |
| Skipper & Co. | C. H. | Clearhill, Victoria Loc. 10200, Eneabba | 8SH and 118D, 10E | 1962 |
| Skippings | E & N | Prettyville, Boyunup | T6E | 1962 |
| Skipsey | J. A. & K. M. | Glenferrie Orchard, Wooroloo | K1S and 18D, 50E | 1962 |
| Skipworth | A. E. | Rosherville, Dardanup | 1CX | 1912 |
| Skipworth | A. E. | Rosherville, Dardanup | 1CX | 1924 |
| Skipworth | Dan | Carnarvon | DZ3 | 1924 |
