| Stafford | S. W. | 31 Kent Street, Victoria Park | Dodge | 6461 | Metro Private Car | 1924-25 |
| Stafford | W. | 31 Kent Street, Victoria Park | Ford | 14424 | Metro Private Car | 1927-28 |
| Staker | F. L. | Arnold Street, Gosnells | Chevrolet | 14661 | Metro Private Car | 1927-28 |
| Stakes | James | Cunderdin | Dodge | ME ● 99 | Meckering Road Board | 1924-25 |
| Stakes | James | Cunderdin | Dodge | ME ● 99 | Meckering Road Board | 1925-26 |
| Stakes | James | Cunderdin | Dodge | ME ● 99 | Meckering Road Board | 1926-27 |
| Stamatis | J. | Palladium Market Fremantle | Chevrolet Wagon | 7301 | Metro Private Car | 1926-27 |
| StandrIng | C. A. | Doodlakine | Overland Truck | KE ● 218 | Kellerberrin Road Board | 1926-27 |
| Standring | C. A. | Doodlakine | Overland Truck | KE ● 218 | Kellerberrin Road Board | 1927-28 |
| Stanes | H. A. | Kellerberrin | Overland 27½ H.P. | KE 2 | Kellerberrin Road Board | 1916 |
| stanley | L. F. | Mount Barker | Overland | PL ● 80 | Plantagenet Road Board | 1925-26 |
| Stanley | L. F. | Mount Barker | Overland | PL ● 80 | Plantagenet Road Board | 1926-27 |
| Stanley | Louis F. | Mount Barker | Overland | PL ● 80 | Plantagenet Road Board | 1924-25 |
| Star Motor Garage | - | 485 Hay Street, Perth | Studebaker | 3101 | Metropolitan Hire and Trade Cars | 1923-24 |
| Star Motor Garage | - | 485 Hay Street, Perth | Studebaker | 3202 | Metropolitan Hire and Trade Cars | 1923-24 |
| Star Motor Garage | - | 485 Hay Street, Perth | Studebaker | 3101 | Metro Private Car | 1924-25 |
| Star Motor Garage | - | Aberdeen Street, Perth | Studebaker | 3366 | Metro Private Car | 1924-25 |
| Star Motor Garage | - | 43 Manchester Street, Victoria Park | Studebaker | 3101 | Metro Hire or Trade | 1925-26 |
| Star Motor Garage | - | Aberdeen Street, Perth | Studebaker | 3366 | Metro Hire or Trade | 1925-26 |
| Stark | C. L. | Lake Grace | Ford | DU ● 41 | Dumbleyung Road Board | 1922-23 |
| Stark | C. L. | Lake Grace | Ford | DU ● 41 | Dumbleyung Road Board | 1923-24 |
| State Government | - | - | Studebaker | P 401 | Perth Municipality | 1916 |
| Statham | Mrs A. M. | The Esplanade Peppermint Grove | Studebaker | 2733 | Metro Private Car | 1926-27 |
| Statham | Mrs A. M. | The Esplanade, Peppermint Grove | Studebaker | 2733 | Metro Private Car | 1927-28 |
| Steadman | W. A. D. | Kukerin | Ford | DU ● 12 | Dumbleyung Road Board | 1924-25 |
| Stedman | W. A. | Kukerin | Ford | DU ● 12 | Dumbleyung Road Board | 1925-26 |
| Stedman | W. A. D. | Kukerin | Ford | DU ● 12 | Dumbleyung Road Board | 1927-28 |
| Stefanoni | A. | The Ledge" Bibra Lake | Ford Wagon | 12219 | Metro Private Car | 1926-27 |
| Steick | J. B. | Porongorups, via Mount Barker | Studebaker | PL 15 | Plantagenet Road Board | 1916 |
| Steick | T. A. | Porongorups | Studebaker | PL ● 15 | Plantagenet Road Board | 1924-25 |
| Steicke | J. B. | Mount Barker | Studebaker 20 H.P. | PL ● 15 | Plantagenet Road Board | 1917-18 |
| Steicke | J. B. | Mount Barker | Studebaker 20 H.P. | PL ● 15 | Plantagenet Road Board | 1919 |
| Steicke | J. B. | Mount Barker | Studebaker 20 H.P. | PL ● 15 | Plantagenet Road Board | 1922-23 |
| Steicke | J. B. | Mount Barker | Studebaker 20 H.P. | PL ● 15 | Plantagenet Road Board | 1923-24 |
| Steicke | J. H. | Katanning | Ford | KA ● 265 | Katanning Road Board | 1926-27 |
| Steicke | J. H. | Katanning | Ford | KA ● 265 | Katanning Road Board | 1927-28 |
| Steicke | T. A. | Mount Barker | Studebaker | PL ● 15 | Plantagenet Road Board | 1924-25 |
| Steicke | T. A. | Porongorups | Studebaker | PL ● 15 | Plantagenet Road Board | 1925-26 |
| Steicke | T. A. | Mount Barker | Studebaker | PL ● 93 | Plantagenet Road Board | 1927-28 |
| Steicke | V. B. | Mount Barker | Rugby | PL ● 147 | Plantagenet Road Board | 1927-28 |
| Stenburg | Mrs J. M. | 9 Labouchere Road, South Perth | Studebaker | 892 | Metro Private Car | 1923-24 |
| Stephens | F. | Lake Grace | Rugby | LG ● 24 | Lake Grace Road Board | 1924-25 |
| Stephens | F. | Lake Grace | Rugby | LG ● 24 | Lake Grace Road Board | 1925-26 |
| Stephens | F. | Lake Grace | Rugby | LG ● 24 | Lake Grace Road Board | 1926-27 |
| Stephens | F. J. | Lake Grace | Fiat | LG ● 24 | Lake Grace Road Board | 1927-28 |
| Stephenson | H. A. | Roe Street, Perth | Studebaker | 5230 | Metro Private Car | 1926-27 |
| Stephenson | H. A. | Roe Street, Perth | Studebaker | 5230 | Metro Private Car | 1927-28 |
| Stern | N. B. | 14 Harley Street | Studebaker 35 H.P. | P 783 | Perth Municipality | 1915 |
| Stettanoni | A. | Bibra Lake | International Wagon | 12550 | Metro Private Car | 1927-28 |
| Stevens | A. E. | Kellerberrin | Rugby | KE ● 108 | Kellerberrin Road Board | 1924-25 |
