| Williams Bros | - | Fitzgerald Street | Hupmobile | N 33 | Northam Municipality | 1925-26 |
| Williams Bros | - | Fitzgerald Street | Case | N 129 | Northam Municipality | 1925-26 |
| Williams Bros | - | Emu Hill | Brockway Wagon | NB ● 82 | Narembeen Road Board | 1926-27 |
| Williams Bros | - | Fitzgerald Street | Hupmobile | N 33 | Northam Municipality | 1926-27 |
| Williams Bros | - | Fitzgerald Street | Case | N 129 | Northam Municipality | 1926-27 |
| Williams Bros | - | Emu Hill | Brockway Wagon | NB ● 82 | Narembeen Road Board | 1927-28 |
| Williams Bros | - | Fitzgerald Street | Hupmobile | N 33 | Northam Municipality | 1927-28 |
| Williams Bros | - | Fitzgerald Street | Reo | N 129 | Northam Municipality | 1927-28 |
| Williams Bros | - | Bedford Street, South Fremantle | Overland Wagon | 11524 | Metro Private Car | 1927-28 |
| Williams Bros. | - | Fitzgerald Street | Triumph | N 68 | Northam Municipality | 1919 |
| Williams-Narrogin Farmers Co-op. | - | Narrogin | Ford | NGN 31 | Narrogin Municipality | 1923-24 |
| Williamson | A. F. | 45 Mount Street | Singer 8-10 H.P. | P 39 | Perth Municipality | 1915 |
| Williamson | A. F. | 45 Mount Street | Buick 20 H.P. | P 39 | Perth Municipality | 1916 |
| Williamson | A. F. | 45 Mount Street | Buick 19 H.P. | P 39 | Perth Municipality | 1917-18 |
| Williamson | A. F. | 45 Mount Street | Buick 18 H.P. | P 39 | Perth Municipality | 1919 |
| Williamson | A. F. | 45 Mount Street, Perth | Dodge | 39 | Metro Private Car | 1922-23 |
| Williamson | A. T. | 45 Mount Street, Perth | Chevrolet | 39 | Metro Private Car | 1925-26 |
| Williamson | A. T. | 45 Mount Street, Perth | Chevrolet | 39 | Metro Private Car | 1926-27 |
| Williamson | A. T. | 45 Mount Street, Perth | Chevrolet | 39 | Metro Private Car | 1926-27 |
| Williamson | A. T. | 45 Mount Street, Perth | Chevrolet | 39 | Metro Private Car | 1927-28 |
| Williamson | Arthur | 45 Mount Street, Perth | Chevrolet | 39 | Metro Private Car | 1923-24 |
| Williamson | B. T. | 93 Rupert Street, Subiaco | B.S.A. & Sidecar | 53 | Metro Motorcycle | 1922-23 |
| Williamson | C. | Marine Terrace | Ford 20 H.P. | GN 11 | Geraldton Municipality | 1919 |
| Williamson | C. | Melangatta Station | Ford | YA ● 31 | Yalgoo Road Board | 1922-23 |
| Williamson | C. | Melangatta Station | Ford | YA ● 31 | Yalgoo Road Board | 1923-24 |
| Williamson | C. | Melangata Station, Yalgoo | Oakland | YA ● 50 | Yalgoo Road Board | 1925-26 |
| Williamson | C. | Dwellingup | Ford | MY ● 138 | Murray Road Board | 1926-27 |
| Williamson | C. | Melangatta Station, Yalgoo | Oakland | YA ● 50 | Yalgoo Road Board | 1926-27 |
| Williamson | Chas. | Melangatta Station, Yalgoo | Ford | YA ● 50 | Yalgoo Road Board | 1923-24 |
| Williamson | Chas. | Melangatta Station, Yalgoo | Ford | YA ● 50 | Yalgoo Road Board | 1924-25 |
| Williamson | D. L. | 326 Rokeby Road | Motorcycle | S 117 | Subiaco Municipality | 1917-18 |
| Williamson | D. L. | 175 Rokeby Road | - | S 117 | Subiaco Municipality | 1919 |
| Williamson | E. A. | Kalgan | Ford | A ● 8 | Albany Road Board | 1927-28 |
| Williamson | F. | Korrelocking | Overland Truck | WM ● 272 | Wyalkatchem Road Board | 1927-28 |
| Williamson | G. | Keymer Street, Belmont | Indian Scout | 57 | Metro Motorcycle | 1922-23 |
| Williamson | G. F. | - | Ford Truck | CU ● 126 | Upper Chapman Road Board | 1926-27 |
| Williamson | G. J. | - | Ford Truck | CU ● 126 | Upper Chapman Road Board | 1927-28 |
| Williamson | H. | 29 Harrogate Street,Leederville | Ford Wagon | 3512 | Metro Hire or Trade | 1925-26 |
| Williamson | H. | Kununoppin | Ford | KTY ● 112 | Kununoppin-Trayning Road Board | 1925-26 |
| Williamson | H. | 29 Harrowgate Street, Leederville | Ford Wagon | 3512 | Metro Hire or Trade | 1926-27 |
| Williamson | H. | Kununoppin | Ford | KTY ● 112 | Kununoppin-Trayning Road Board | 1926-27 |
| Williamson | H. | Kununoppin | Ford | KTY ● 112 | Kununoppin-Trayning Road Board | 1927-28 |
| Williamson | H. | 29 Harrowgate Street, Leederville | Ford Wagon | 3512 | Metro Hire or Trade | 1927-28 |
| Williamson | J. | Goomalling | Dodge 25 H.P. | GO ● 32 | Goomalling Road Board | 1919 |
| Williamson | J. | Waroona | Chevrolet Truck | DK ● 39 | Drakesbrook Road Board | 1927-28 |
| Williamson | J. A. | Francis Street, Geraldton | Dodge | GN 187 | Geraldton Municipality | 1927-28 |
| Williamson | J. A. I. | Albany | Chevrolet | A 173 | Albany Municipality | 1927-28 |
| Williamson | J. L. | Cranbrook | Ford | PL ● 52 | Plantagenet Road Board | 1924-25 |
| Williamson | J. L. | Cranbrook | Overland | PL ● 52 | Plantagenet Road Board | 1925-26 |
| Williamson | J. L. | Cranbrook | Overland | CB ● 1 | Cranbrook Road Board | 1926-27 |
