| Senior | S. B. | Wickepin | Dodge | WK ● 169 | Wickepin Road Board | 1926-27 |
| Senior | S. B. | Wickepin | Dodge | WK ● 169 | Wickepin Road Board | 1927-28 |
| Sennott | N. P. | Upper Blackwood | Overland | BU ● 11 | Upper Blackwood Road Board | 1922-23 |
| Sennott | N. P. | Upper Blackwood | Overland | BU ● 11 | Blackwood (Upper) Road Board | 1923-24 |
| Separito | M. | Marmellup | Ford | SU ● 40 | Sussex Road Board | 1926-27 |
| Separito | M. | Marmellup | Ford | SU ● 40 | Sussex Road Board | 1927-28 |
| Seppeit & Sons | B. | Packenham Street, Fremantle | Dodge | 9727 | Metro Private Car | 1926-27 |
| Seppell & Sons | - | Packenham Street, Fremantle | Graham | 12287 | Metro Private Car | 1926-27 |
| Seppelt & Sons | - | 29 Pakenham Street, Fremantle | Graham Wagon | 12287 | Metro Private Car | 1927-28 |
| Sergeant | W. T. | Carnamah | Ford | CA ● 13 | Carnamah Road Board | 1924-25 |
| Seriesser | Mrs | Wonnerup | Ford | SU ● 32 | Sussex Road Board | 1925-26 |
| Seriesser | Mrs | Wonnerup | Ford | SU ● 32 | Sussex Road Board | 1927-28 |
| Serissier | J. | 65 Lawler Street, Subiaco | Ford | 7491 | Metro Private Car | 1925-26 |
| Serkowackoff | A. | - | Buick 12-15 H.P. | KMC 13 | Kalgoorlie Municipality | 1915 |
| Serman | J. | Burges Siding | Rollin | Y ● 92 | York Road Board | 1927-28 |
| Sermon | A. | Grass Valley | Essex | N ● 43 | Northam Road Board | 1926-27 |
| Sermon | A. | Grass Valley | Essex | N ● 43 | Northam Road Board | 1927-28 |
| Sermon | C. R. | Malebelling | Chevrolet | Y ● 109 | York Road Board | 1926-27 |
| Sermon | C. R. | Malebelling | Rugby | Y ● 109 | York Road Board | 1927-28 |
| Sermon | F. T. | 175 Lake Street | Indian 2¾ H.P. Motorcycle | P 1279 | Perth Municipality | 1919 |
| Sermon | F. T. | - | Chryster | N ● 10 | Northam Road Board | 1927-28 |
| Sermon | F. T. | - | Republic Truck | N ● 146 | Northam Road Board | 1927-28 |
| Sermon | J. | Northam | Car | N ● 28 | Northam Road Board | 1917-18 |
| Sermon | J. | Northam | Ford | N 28 | Northam Road Board | 1919 |
| Sermon | J. | Grass Valley | Dodge | N ● 28 | Northam Road Board | 1925-26 |
| Sermon | J. | Burges Siding | Rollin | Y ● 92 | York Road Board | 1925-26 |
| Sermon | J. | Grass Valley | Dodge | N ● 28 | Northam Road Board | 1926-27 |
| Sermon | J. | Burges Siding | Rollin | Y ● 92 | York Road Board | 1926-27 |
| Sermon | J. | Grass Valley | Dodge | N ● 28 | Northam Road Board | 1927-28 |
| Sermon | Jas. | Grass Valley | Dodge | N ● 28 | Northam Road Board | 1922-23 |
| Sermon | Jas. | Grass Valley | Dodge | N ● 28 | Northam Road Board | 1923-24 |
| Sermon | Jas. | Grass Valley | Dodge | N ● 28 | Northam Road Board | 1924-25 |
| Sermon | Jas. | Grass Valley | Ford | N ● 32 | Northam Road Board | 1924-25 |
| Sermon | K. | Grass Valley | Essex | N ● 108 | Northam Road Board | 1926-27 |
| Sermon | K. | Grass Valley | Essex | N ● 108 | Northam Road Board | 1927-28 |
| Sermon | M. | Grass Valley | Ford 20 H.P. | N 43 | Northam Road Board | 1919 |
| Sermon | M. | Grass Valley | Ford | N ● 43 | Northam Road Board | 1922-23 |
| Sermon | M. | Grass Valley | Ford | N ● 43 | Northam Road Board | 1923-24 |
| Sermon | M. | Grass Valley | Grey | N ● 43 | Northam Road Board | 1924-25 |
| Sermon | M. | Grass Valley | Gray | N ● 43 | Northam Road Board | 1925-26 |
| Sermon | R. | Grass Valley | Buick | N ● 93 | Northam Road Board | 1926-27 |
| Sermon | R. | Grass Valley | Buick | N ● 93 | Northam Road Board | 1927-28 |
| Sermon | R. C. | Grass Valley | Buick | N ● 93 | Northam Road Board | 1924-25 |
| Sermon | R. C. | Grass Valley | Buick | N ● 93 | Northam Road Board | 1925-26 |
| Serpentine Jarrahdale Road Board | - | | Overland | SJ ● 51 | Serpentine-Jarrahdale Road Board | 1927-28 |
| Serpentine-Jarrahdale Road Board | - | Mundijong | Reo Truck | SJ ● 51 | Serpentine-Jarrahdale Road Board | 1925-26 |
| Sertorio | P. | Balcatta | Ford Truck | P ● 172 | Perth Road Board | 1927-28 |
| Service Furniture Factory | - | 14 Tower street Leederville | Rugby | 4598 | Metro Private Car | 1927-28 |
| Setterfield | F. G. | Fairlight Street, Cottesloe Beach | Hupmobile | 1302 | Metro Private Car | 1927-28 |
| Setwood | Alfred | 236 Onslow Road, West Subiaco | Ford Wagon | 4295 | Metro Private Car | 1927-28 |
