| Scrivener | H. R. | Rose Hill and Hastings, Wandering | H2S | 1912 |
| Scrivener | H. R. | Rose Hill and Hastings, Wandering | H2S | 1924 |
| Scrivener | W. | King Street, Gosnells | NU8 | 1924 |
| Scrivener | Wm. | Hillside, Midland Junction | 9SR | 1912 |
| Scrivener | Wm. | Hillside, Midland Junction | 9SR | 1924 |
| Scroope | Mrs E. | Irwin House, Irwin | 3BU | 1924 |
| Scroope | Mrs. E. | Irwin House, Irwin | 3BU | 1912 |
| Scrymgour | A. E. | Pilbarra, Marble Bar | LS0 | 1912 |
| Scrymgour | A. E. | Pilbarra, via Marble Bar | LS0 | 1924 |
| Scrymgour | A. G. | Block 1181, Nangeenan | 8SN | 1912 |
| Scudds | J. D. | Stirling Farm, Pingelly | 9SC | 1912 |
| Scudds | J. D. | Stirling Farm, Pingelly | 9SC | 1924 |
| Scully | Amelia K. | Nabawa, via Geraldton | 6KS | 1924 |
| Scully | Annie | Green Valley, Greenbushes | AS0 | 1912 |
| Scully | Annie | Green Valley, Greenbushes | AS0 | 1924 |
| Scully | S. W. & L. S. | 2809, Nanson, via Geraldton | 6KS and 22C, 117E | 1962 |
| Scursatone | B. A. | Wellington Loc. 49, Waterloo | SE5 | 1962 |
| Scutter | W. G. | Cagerpin, Kellerberrin | W6S and 14C, 109A | 1962 |
| Seabrock | Samuel B. | Avon Locs. 19124, 19122, and 22874, Totadjin, via Merredin | BQ4 | 1925 |
| Seabrook | C. W. | Seabourne, Greenhills | WY0 | 1924 |
| Seabrook | Robert James | Fitz. Locs. 381 and 873, Salmon Gums | R6S | 1926 |
| Seabrook | W. & P. | Seabourne, York | WY0 and 102C, 19A | 1962 |
| Seaby & Sons | H. V. | Karloning, Mukinbudin | SH0 and 49D, 21E | 1962 |
| Seaforth Boys Home | - | Seaforth, Seaforth | SB1 | 1962 |
| Seager | Lawrence G. | Murray Loc. 507, Hamel | ZU6 | 1925 |
| Seagrott | Geo. | Wiluna | SO3 | 1924 |
| Seal | Ed. Wm. | Candover Farm, 141 Mile Gate, E. Katanning | 6US | 1924 |
| Seala | Danic | Canning Loc. 706, Kalamunda Road, Welshpool | VS7 | 1924 |
| Seaman | J. & R. J. | Tardie, Whurarga | DC8 and 10D, 113E | 1962 |
| Seaman | J. A. | Glen View, Malebelling, Green Hills, Yalgoo | 8AS | 1924 |
| Seaman | Jas. | Durham Farm, Meckering | 7SZ | 1924 |
| Seaman | T | Commonage, Yalgoo | DC8 | 1912 |
| Seaman | T. | Yalgoo | DC8 | 1924 |
| Seamon | J. A. | Glen View, Malelling, Greenhills | 8AS | 1912 |
| Sear | W. E. & H. A. | Kingsdale, Benjaberring | 8SW | 1912 |
| Sear | W. E. & H. A. | Kingsdale, Benjabbering | 8SW | 1924 |
| Searle | Elizabeth | Tuckanarra | U8S | 1924 |
| Searle | H. W. F. | Kent 1465, Gairdner River | W8S and 39D, 41E | 1962 |
| Searle | W. | Grove Farm, Broomehill | 2WS | 1912 |
| Searle | W. | Grove Farm, Broomehill | 2WS | 1924 |
| Searles | J. & H. M. | Crystal Dene, Bakers Hill | JO5 and 84C, 84E | 1962 |
| Sears | Albert Henry | Yallingup, via Busselton | A9Z | 1924 |
| Sears | J. A. | Brookhampton | 0QY | 1925 |
| Sears | W. J. | Challistown Farm, Donnybrook | ZZ5 | 1924 |
| Sears & Sons | - | Alpha Park, Brookham | S1S | 1912 |
| Seaton | I. | Cimbrone Stud, Maida Vale | C1M | 1962 |
| Seaton & Egan | A. & J. F. | The Commons, Hall's Creek | Y1A | 1924 |
| Seaton Ross Pastoral Co. | - | Seaton Ross, Yericoin | SR9 and 32D, 42E | 1962 |
| Sebbes | J. A. | Gascoyne, Sussex 2704, Forest Grove | SJ8 and 7C, 50E | 1962 |
| Sebbes | Wm. | Roebourne | 7YY | 1924 |
