| Skewes | W. W. J. | 151 Rokeby Road, Subiaco | Studebaker | 2948 | Metro Private Car | 1927-28 |
| Skews | H. H. | 135 Hanbury Street | Studebaker 20 H.P. Hire Car | KMC 45 | Kalgoorlie Municipal Council | 1917-18 |
| Skews | H. H. | 135 Hanbury Street | Studebaker 20 H.P. | KMC 45 | Kalgoorlie Municipality | 1919 |
| Skews | Harold | 1 Albert Street, North Perth | Studebaker | 3066 | Metropolitan Hire and Trade Cars | 1923-24 |
| Skewws | W. | Bunbury | Ford 20 H.P. | By 22 | Bunbury Municipality | 1919 |
| Skinner | J. | - | Studebaker | P ● 4 | Perth Road Board | 1919 |
| Skinner | J. J. | 32 Keightley Road, Subiaco | Dodge | 1322 | Metro Private Car | 1923-24 |
| Skinner | T. | Mount Barker | Buick | PL ● 136 | Plantagenet Road Board | 1927-28 |
| Skinner | Thos. | Carbarup Mount Barker | Overland | PL ● 70 | Plantagenet Road Board | 1922-23 |
| Skinner | Thos. | Carbarup, Mount Barker | Overland | PL ● 70 | Plantagenet Road Board | 1923-24 |
| Skinner | Thos. | Carbarup Mount Barker | Overland | PL ● 70 | Plantagenet Road Board | 1924-25 |
| Skipper | C. L. R. | Wanneroo | Studebaker | WN ● 32 | Wanneroo Road Board | 1927-28 |
| Slade | A. | Tammin | Ford | ME ● 46 | Meckering Road Board | 1922-23 |
| Slamon | J. | Mount Barker | Essex | PL ● 24 | Plantagenet Road Board | 1927-28 |
| Slarke | C. L. | Lake Grace | | LG ● 16 | Lake Grace Road Board | 1924-25 |
| Slarke | E. | Lake Grace | Buick | LG ● 69 | Lake Grace Road Board | 1925-26 |
| Slarke | E. | Lake Grace | Buick | LG ● 69 | Lake Grace Road Board | 1926-27 |
| Slarke | E. | Lake Grace | Buick | LG ● 69 | Lake Grace Road Board | 1927-28 |
| Slarke | E. C. | Lake Grace | Ford | LG ● 16 | Lake Grace Road Board | 1927-28 |
| Slarke | G. L. | Lake Grace | Ford | LG ● 16 | Lake Grace Road Board | 1925-26 |
| Slarke | G. L. | Lake Grace | Ford | LG ● 16 | Lake Grace Road Board | 1926-27 |
| Slater | J. | Kellerberrin | Indian 7 H.P. Motorcycle | KE ● 37 | Kellerberrin Road Board | 1922-23 |
| Slater | J. | Kellerberrin | Ford | KE ● 105 | Kellerberrin Road Board | 1924-25 |
| Slater | J. | Kellerberrin | Ford | KE ● 105 | Kellerberrin Road Board | 1925-26 |
| Slater | J. | Kellerberrin | Rugby | KE ● 105 | Kellerberrin Road Board | 1926-27 |
| Slater | J. | Kellerberrin | Rugby | KE ● 105 | Kellerberrin Road Board | 1927-28 |
| Slater | T. | Goomalling | Studebaker 25 H.P. | GO ● 6 | Goomalling Road Board | 1917-18 |
| Slater | T. | Goomalling | Studebaker 25 H.P. | GO ● 6 | Goomalling Road Board | 1919 |
| Slater | Thomas L. | Goomalling | Studebaker 30 H.P. | G 6 | Goomalling Road Board | 1915 |
| Slater | Thos. | Goomalling | Studebaker 30 H.P. | GO 6 | Goomalling Road Board | 1916 |
| Slatter | Mrs M. | Albany Road, Kelmscott | Singer | 13664 | Metro Private Car | 1926-27 |
| Slattery | William | Thompson Road | Studebaker 26 H.P. | NF 310 | North Fremantle Municipality | 1919 |
| Slattery | William | c/o Burford & Sons, North Fremantle | Studebaker | 1613 | Metro Private Car | 1923-24 |
| Slattery | William | C/o Burford & Sons North Fremantle | S'baker | 1613 | Metro Private Car | 1924-25 |
| Slattery | Wm. | Thompson Road, N.Fremantle | Studebaker | 1613 | Metro Private Car | 1922-23 |
| Slee | E. J. W. | Warren Road | Rugby | KT ● 26 | Kent Road Board | 1925-26 |
| Slee | E. J. W. | Warren Road | Rugby | KT ● 26 | Kent Road Board | 1926-27 |
| Slee | E. J. W. | Warren Road | Rugby | KT ● 26 | Kent Road Board | 1927-28 |
| Slee | Mary A. | Kelmscott | Chrysler | 2966 | Metro Private Car | 1927-28 |
| Sloan | T. G. | 2 Nicholson Street, Leederville | Studebaker | 13897 | Metro Private Car | 1926-27 |
| Slom | H. | Holyoake | Chevrolet | MY ● 97 | Murray Road Board | 1924-25 |
| Sloss | T. | Kellerberrin | Premier 3 ½ H.P. | KE 2 | Kellerberrin Road Board | 1916 |
| Smith | A. | Kellerberrin | Dodge | KE ● 258 | Kellerberrin Road Board | 1926-27 |
| Smith | A. | Kellerberrin | Dodge | KE ● 258 | Kellerberrin Road Board | 1927-28 |
| Smith | A. G. | Kukerin | Ford | DU ● 160 | Dumbleyung Road Board | 1926-27 |
| Smith | A. G. | Kukerin | Ford | DU ● 160 | Dumbleyung Road Board | 1927-28 |
| Smith | C. | Market Street, Guildford | Buick | 5952 | Metro Private Car | 1925-26 |
| Smith | C. H. | 26 Parker Street, West Perth | Flint | 8068 | Metro Private Car | 1925-26 |
| Smith | Charles | Lake View G.M. | Ford Truck | K ● 182 | Kalgoorlie Road Board | 1927-28 |
| Smith | David S. | Meckering | Ford | ME ● 70 | Meckering Road Board | 1922-23 |
