| Young Bros | - | Carnarvon | Commercial Truck | CN 29 | Carnarvon Municipal Council | 1927-28 |
| Young Bros | - | Kondinin | Ford | KN ● 34 | Kondinin Road Board | 1927-28 |
| Young Bros | - | Aldersyde | Dodge | BO ● 2 | Brookton Road Board | 1927-28 |
| Young Bros. | - | Brookton | Ford 20 H.P. | BKTB 2 | Brookton Road Board | 1915 |
| Young Bros. | - | Brookton | Ford 20 H.P. | BO 2 | Brookton Road Board | 1916 |
| Young Bros. | - | Aldersyde | Ford 20 H.P. | BO ● 2 | Brookton Road Board | 1919 |
| Young Bros. | - | Aldersyde | Ford 20 H.P. | BO ● 2 | Brookton Road Board | 1923-24 |
| Young Bros. | - | Kondinin | Ford | RE ● 21 | Roe Road Board | 1923-24 |
| Youngberg | Marion | 3 Eileen Street, Cottesloe | Citroen | 8788 | Metro Private Car | 1927-28 |
| Younger | J. | 117 Street, Leonard's Avenue, West Perth | Ford | 302 | Metro Private Car | 1925-26 |
| Yoynooich | Tony | C/o P.O. Fimiston | Indian Motorcycle | K ● 5 | Kalgoorlie Road Board | 1922-23 |
| Yuanmi Gold Mine Ltd | - | Black Range | Ford 20 H.P. | BRRB 2 | Black Range Road Board | 1915 |
| Yuanmi Gold Mine Ltd | - | Black Range | E.M.F. 20 H.P. | BRRB 6 | Black Range Road Board | 1915 |
| Yuen | Hoy Poy | The Avenue, Nedlands | Hupmobile | 2388 | Metro Private Car | 1922-23 |
| Yuen | Hoy Poy | The Avenue, Nedlands | Rover | 2540 | Metro Private Car | 1923-24 |
| Yuen | Hoy Poy | 297 James Street, Perth | Buick | 2866 | Metro Private Car | 1923-24 |
| Yuin | Eagan and Hillier | Via Wurarga | Ford | MW ● 22 | Mullewa Road Board | 1923-24 |
| Yuin Pastoral Co Ltd | - | Yuin Station | Overland | MU ● 22 | Murchison Road Board | 1926-27 |
| Yuin Pastoral Co Ltd | - | Yuin Station | Ford Truck | MU ● 49 | Murchison Road Board | 1926-27 |
| Yuin Pastoral Co Ltd | - | Yuin Station | Overland | MU ● 22 | Murchison Road Board | 1927-28 |
| Yuin Pastoral Co Ltd | - | Yuin Station | Ford | MU ● 36 | Murchison Road Board | 1927-28 |
| Yuin Pastoral Co Ltd | - | Yuin Station | Ford Truck | MU ● 49 | Murchison Road Board | 1927-28 |
| Yuin Pastoral CoLtd | - | Yuin Station | Ford | MU ● 36 | Murchison Road Board | 1926-27 |
| Yule | Dr. Smythe. | Broome Hill | Douglas 2¾ H.P. Motorcycle Motorcycle | B 7 | Broome Municipality | 1915 |
| Yule | George | Balingup | Overland | BN ● 3 | Balingup Road Board | 1923-24 |
| Yule | J. F. | 13 Burt Street, North Perth | Premier 3½ H.P. Motorcycle | P 1325 | Perth Municipality | 1919 |
| Yull | George | Balingup | Briscoe 22 H.P. | BN ● 3 | Balingup Road Board | 1922-23 |
| Yundamin Pastoral Co | - | Yundamin | Reo Truck | LM ● 97 | Leonora-Malcolm Road Board | 1927-28 |
| Yundamindra Pastoral Co Ltd | - | Yundamindera | Ford | LM ● 20 | Leonora-Malcolm Road Board | 1924-25 |
| Yundamindra Pastoral Co Ltd | - | Yundamindera | Dodge | LM ● 25 | Leonora-Malcolm Road Board | 1924-25 |
| Yundamindra Pastoral Co Ltd | - | Yundamin | Dodge | LM ● 25 | Leonora-Malcolm Road Board | 1926-27 |
| Yundamindra Pastoral Co Ltd | - | Yundamin | Dodge | LM ● 25 | Leonora-Malcolm Road Board | 1927-28 |
| Yundamindra Pastoral Coy. | - | Murrin Murrin | Ford 19 H.P. | LM ● 4 | Leonora-Malcolm Road Board | 1922-23 |
| Yundamindra Pastoral Coy. | - | Murrin Murrin | Ford 19 H.P. | LM ● 4 | Leonora-Malcolm Road Board | 1923-24 |
| Yunfamindra Pastoral Co Ltd | - | Yundamindra | Dodge | LM ● 25 | Leonora-Malcolm Road Board | 1925-26 |
