| Slattery | F. K. | Bindoon Hill, Bindoon | 9KS and 44D, 38E | 1962 |
| Slattery | J. C. | Lots 10 and 54, Bunbury | PS7 and 40B, 16E | 1962 |
| Slattery | Jas. | Brooklawn, Dardanup | S8J | 1912 |
| Slattery | Jas. | Brooklawn, Darnup | S8J | 1924 |
| Slattery | P. sen. | Ferguson | 2PS | 1912 |
| Slattery | P., sen. | Ferguson | 2PS | 1924 |
| Slattery | Patk. | Ferguson | PS7 | 1912 |
| Slattery | Patk. | Ferguson | PS7 | 1924 |
| Slaughter | Eliz. Rose | Manor Farm, Boyauup | E9U | 1924 |
| Slaven & Phillipe | - | Ellersford farm, Wanamal | 9BA | 1924 |
| Slaven & Phillippe | - | Ellersford Farm, Wannamal | 9BA | 1912 |
| Slavin | John | Deer Park, Bootenal | J6N | 1912 |
| Slavin | John | Deer Park, Bootenal | J0N | 1924 |
| Slavonian Vineyard | - | Slavonian Vineyard, Armadale | SV6 | 1924 |
| Slayter | E. L. P. | Liberton, Wooroloo | N1R and 47B, 10E | 1962 |
| Slee | A. G. | Melrose, 531, Ongerup | AS8 and 13C, 116E | 1962 |
| Slee | C. E. | Peninsula Hotel, Mandurah | 9ES | 1912 |
| Slee | C.E. | Peninsula Hotel, Mandurah | 9ES | 1924 |
| Slee | Edgar J. W. | Eastern Valley, Warren road, Katanning | EZ2 | 1924 |
| Slee | F. | Hillside, Busselton | FS6 | 1962 |
| Slee | F. G. | 1854, Denmark | 1FS | 1962 |
| Slee | Frederick | Hillside, Yoongarilup via, Busselton | FS6 | 1927 |
| Slee | H. J. & A. M. | Loc. 4790 (P.), Albany | 2AS and 12D, 9E | 1962 |
| Slee | Josiah | Beverley | 3LE | 1924 |
| Slee | P. C. & D. L. | Hallowell, Denmark | SS7 and 40D, 84E | 1962 |
| Slee | R. A. R. | Novalia, Fergusson, Via Dardanup | R4S and 19C, 118A | 1962 |
| Slee | Thos. Walter | Mourambine, via Pingelly Roebourne | YT3 | 1924 |
| Slee & Johnston | E. J. & F. M. | Pt. Leschenault 26, Bunbury | ER1 and 4C, 17E | 1962 |
| Sleeman | H. R. | Mt. Satirist, Mallina via Roebourne | RA0 | 1912 |
| Sleeman | H. R. | Mt. Satirist, Mallina | RA0 | 1912 |
| Sleeth | Robert John | Claymore | XQ8 | 1925 |
| Sleight | A. | Tolgamine, Grass Valley | 8AS and 21D, 23E | 1962 |
| Sleight | Norman Victor | Victoria Locs. 4202 and 4750, Perenjori | 4NS | 1926 |
| Sleight | P. T. | Loc. 9762-3, Manjimup | 5XS | 1962 |
| Slingsby | H. | Canonbury and Douglas Farms, Canonbury, Donnelly River, Manjimup | X3X | 1924 |
| Sloan | A. T. | Roselea, East Rockingham | Z7S | 1926 |
| Sloan | A. T. F. J. & C. T. | Rosalie Stud, East Rockingham | Z7S and 67B, 5E | 1962 |
| Sloan | A. W. (jnr) | Boondinin, Kondinin | 0AS and 33B, 116A | 1962 |
| Sloan | C. T. | Rosalie Stud Farm, East Rockingham | 1ZS | 1962 |
| Sloan | D. G. D. | Woodlands, Rockingham | 1ZS | 1912 |
| Sloan | D. G. D. | Woodlands, Rockingham | 1ZS | 1924 |
| Sloan | Emma E. | Cockburn Sound, via Rockingham | G7S | 1924 |
| Sloan | F. J. & V. R. | Plantagenet Loc. 3116 and 5628, Youngs Siding | P7S and 45C, 9A | 1962 |
| Sloan | G. S. | Rockingham, Cockburn Sound | G7S | 1912 |
| Sloan | H. | Forrest Hill, Kondinin | 6AS and 44B, 11E | 1962 |
| Sloan | H. | Silverdale, Buckingham, Via Collie | 8SL and 16C, 67E | 1962 |
| Sloan | H. N. | Plantagenet 5937, Youngs Siding | 0LS and 55F, 28B | 1962 |
| Sloan | J. & E. | Corbio Farm, Pingelly | UZ8 and 20C, 7E | 1962 |
| Sloan | J. & J. | Cheyenne, Gingin | CS9 and 31B, 80E | 1962 |
| Sloan | James | Corbie Farm, South Wandering Road, Pingelly | UZ8 | 1924 |
