| Simper Ltd | H. J. & F. | Fremantle Markets | Daimler Wagon | 3207 | Metro Hire or Trade | 1925-26 |
| Simper Ltd | H. J. and F. | Fremantle Markets, Fremantle | Ford | 1860 | Metro Private Car | 1923-24 |
| Simper Ltd | H. J. and F. | Fremantle Markets, Fremantle | Ford | 1908 | Metro Private Car | 1923-24 |
| Simper Ltd | H. J. and F. | Fremantle Markets | Diamler Wagon | 3207 | Metropolitan Hire and Trade Cars | 1923-24 |
| Simpers Ltd | - | Fremantle Markets | Ford | 1908 | Metro Private Car | 1922-23 |
| Simpers Ltd | - | Fremantle Markets | Daimler wagon | 3207 | Metro Vehicle for Hire | 1922-23 |
| Simpers Ltd | - | Stirling-Street Market | Dodge | 794 | Metro Private Car | 1922-23 |
| Simpkin | H. | - | Dodge | NR ● 124 | Northampton Road Board | 1926-27 |
| Simpkin | H. | - | Dodge | NR ● 124 | Northampton Road Board | 1927-28 |
| Simpkin | J. H. | Binnu | Chevrolet | NR ● 1 | Northampton Road Board | 1924-25 |
| Simpkin | J. H. | Binnu | Chevrolet | NR ● 1 | Northampton Road Board | 1925-26 |
| Simpkin | J. H. | Binnu | Chevrolet | NR ● 1 | Northampton Road Board | 1926-27 |
| Simpkin | J. H. | Binnu | Chevrolet | NR ● 1 | Northampton Road Board | 1927-28 |
| Simpson | A. | Derby Road | - | S 131 | Subiaco Municipality | 1919 |
| Simpson | A. | Paynesville | Overland | MA ● 8 | Mount Magnet Road Board | 1924-25 |
| Simpson | A. | Broomehill | Morris-Cowley | BH ● 92 | Broomehill Road Board | 1926-27 |
| Simpson | A. | Broomehill | Morris-Cowley | BH ● 92 | Broomehill Road Board | 1927-28 |
| Simpson | A. | Waterloo | Dodge | DA ● 91 | Dardanup Road Board | 1927-28 |
| Simpson | A. C. | 41 Havelock Street | Overland 20 H.P. | P 81 | Perth Municipality | 1916 |
| Simpson | A. C. | 41 Havelock Street | Detroiter 16 H.P. | P 81 | Perth Municipality | 1917-18 |
| Simpson | A. C. | Union Brewery Perth | Overland | 14089 | Metro Private Car | 1926-27 |
| Simpson | A. G. | 41 Havelock Street | Overland 20 H.P. | P 81 | Perth Municipality | 1915 |
| Simpson | A. G. | Union Brewery | Detroiter 15 H.P. | P 81 | Perth Municipality | 1919 |
| Simpson | A. G. | c/o Union Brewery, Perth | Austin | 2649 | Metro Private Car | 1923-24 |
| Simpson | A. G. | Paynesville | Overland | MA ● 8 | Mount Magnet Road Board | 1925-26 |
| Simpson | A. G. | Paynesville | Overland | MA ● 8 | Mount Magnet Road Board | 1926-27 |
| Simpson | A. G. | - | Graham Truck | MA ● 60 | Mount Magnet Road Board | 1926-27 |
| Simpson | A. G. | - | Graham Truck | MA ● 60 | Mount Magnet Road Board | 1927-28 |
| Simpson | A. H. | Paynesville | Overland | MA ● 8 | Mount Magnet Road Board | 1927-28 |
| Simpson | A. R. | Perth | Chevrolet | 2434 | Metro Private Car | 1926-27 |
| Simpson | Archdeacon | Broome | Ford | BM ● 36 | Broome Road Board | 1926-27 |
| Simpson | Archdeacon H. W. | Broome | Ford | BM ● 26 | Broome Road Board | 1927-28 |
| Simpson | Arthur | Paynesville | Overland 30 H.P. | MA ● 9 | Mount Magnet Road Board | 1922-23 |
| Simpson | Arthur | Mount Magnet | Overland | MA ● 8 | Mount Magnet Road Board | 1923-24 |
| Simpson | C. | Kondinin | Ford Truck | KN ● 45 | Kondinin Road Board | 1926-27 |
| Simpson | C. | Kondinin | Ford Truck | KN ● 45 | Kondinin Road Board | 1927-28 |
| Simpson | C. D. | Wickepin | Dodge | WK ● 257 | Wickepin Road Board | 1927-28 |
| Simpson | Craig | 37 Woodroyd Street, Mount Lawley | Buick | 916 | Metro Private Car | 1926-27 |
| Simpson | E. E. | Dangin | Essex | Q ● 124 | Quairading Road Board | 1925-26 |
| Simpson | E. E. | Dangin | Essex | Q ● 124 | Quairading Road Board | 1926-27 |
| Simpson | E. E. | Dangin | Essex | Q ● 124 | Quairading Road Board | 1927-28 |
| Simpson | E. K. | Capel | Chevrolet | CP ● 90 | Capel Road Board | 1927-28 |
| Simpson | F. | 71 Mabel Street, North Perth | Hupmobile | 6815 | Metro Private Car | 1925-26 |
| Simpson | F. | Merredin | Chevrolet | MD ● 332 | Merredin Road Board | 1927-28 |
| Simpson | F. C. | Quairading | Ford Truck | Q ● 259 | Quairading Road Board | 1927-28 |
| Simpson | F. H. | 54 Hampton Road, Fremantle | Oldsmobile | 12239 | Metro Private Car | 1926-27 |
| Simpson | F. S. | 71 Mabel Street, North Perth | Essex | 8572 | Metro Private Car | 1926-27 |
| Simpson | F. S. | 71 Mabel Street, North Perth | Essex | 8572 | Metro Private Car | 1927-28 |
| Simpson | F. W. | 90 Mabel Street, North Perth | Columbia | 8094 | Metro Private Car | 1925-26 |
| Simpson | G. | Karragullen | Chevrolet | 6882 | Metro Private Car | 1926-27 |
