| Kan | Alfred H. | Narrikup | Triumph Motorcycle | PL ● 42 | Plantagenet Road Board | 1922-23 |
| Kan | F. J. | Coorow | Oldsmobile | CA ● 132 | Carnamah Road Board | 1926-27 |
| Kan | F. J. | Coorow | Oldsmobile | CA ● 132 | Carnamah Road Board | 1927-28 |
| Kane | J. | Kununoppin | Citroen | KTY ● 59 | Kununoppin-Trayning Road Board | 1925-26 |
| Kane | J. | Kununoppin | Citroen | KTY ● 59 | Kununoppin-Trayning Road Board | 1926-27 |
| Kane | J. | Kununoppin | Citroen | KTY ● 59 | Kununoppin-Trayning Road Board | 1927-28 |
| Kane & Wilson | - | Newdegate | Graham Truck | LG ● 124 | Lake Grace Road Board | 1927-28 |
| Kanger | A. | Manjimup | Dodge | WA ● 22 | Manjimup Road Board | 1925-26 |
| Kanger | Alfred | Manjimup | Dodge | WA ● 22 | Warren Road Board | 1923-24 |
| Kanger | Alfred | Manjimup | Dodge | WA ● 22 | Warren Road Board | 1924-25 |
| Kannegisser | Krut | Manjimup | Excelsior Motorcycle | WA ● 17 | West Arthur Road Board | 1922-23 |
| Kanpton | W. N. | Corrigin | Ford Truck | CR ● 279 | Corrigin Road Board | 1927-28 |
| Kanyan | Sarah | 185 North Beach Road, Mount Hawthorn | Ford Truck | 13100 | Metro Private Car | 1927-28 |
| Kanzler | H. F. | Hotham | Essex | MR ● 15 | Marradong Road Board | 1924-25 |
| Kapp | Mrs | Wilson Street, Kalgoorlie | Oakland | KMC 254 | Kalgoorlie Municipal Council | 1926-27 |
| Kapp | Mrs | Wilson Street, Kalgoorlie | Oakland | KMC 254 | Kalgoorlie Municipal Council | 1927-28 |
| Karara Station | - | Perenjori | Oldsmobile | PM ● 15 | Perenjori-Morawa Road Board | 1927-28 |
| Karara Station | - | Perenjori | Ford | PM ● 110 | Perenjori-Morawa Road Board | 1927-28 |
| Karhu | H. | 26 Diver Street, Claremont | Ford | 8994 | Metro Private Car | 1925-26 |
| Karhu | H. | 26 Griver Street, Cottesloe | Ford | 8994 | Metro Private Car | 1927-28 |
| Karhu | Lally V. | 26 Driver Street, Cottesloe | Ford | 8994 | Metro Private Car | 1926-27 |
| Karlgarin - Kondinin Motor Transport Co Ltd | - | - | Reo Truck | KN ● 32 | Kondinin Road Board | 1925-26 |
| Karlgarin-Kondinin Motor Transport Co Ltd | - | - | Reo Truck | KN ● 32 | Kondinin Road Board | 1926-27 |
| Karri Timber Co | - | Nannup | Dodge | BL ● 9 | Nannup Road Board | 1926-27 |
| Karri Timber Co | - | Nannup | Dodge | BL ● 9 | Nannup Road Board | 1927-28 |
| Karshaw | Mrs | 9 Blencowe Street, West Leederville | Dodge | 2231 | Metro Private Car | 1925-26 |
| Kaskell | Thomas | Corrigin | Ford Truck | CR ● 56 | Corrigin Road Board | 1927-28 |
| Kassell | S. | Cunderdin | Ford Truck | ME ● 220 | Meckering Road Board | 1926-27 |
| Katanning Road Board | - | Katanning | Triumph 2¾ H.P. Motorcycle | KRB 3 | Katanning Road Board | 1915 |
| Katanning Road Board | - | Katanning | Triumph | KA 3 | Katanning Road Board | 1916 |
| Katanning Road Board | - | Katanning | Triumph Motorcycle | KA ● 3 | Katanning Road Board | 1917-18 |
| Katanning Road Board | - | Katanning | Ford | KA 29 | Katanning Road Board | 1919 |
| Katanning Road Board | - | Katanning | Ford Truck | KA ● 209 | Katanning Road Board | 1925-26 |
| Katanning Road Board | - | Katanning | Ford Truck | KA ● 209 | Katanning Road Board | 1926-27 |
| Katanning Road Board | - | Katanning | Ford Truck | KA ● 209 | Katanning Road Board | 1927-28 |
| Katanning Road Board | - | Katanning | Ford Truck | KA ● 361 | Katanning Road Board | 1927-28 |
| Katnich | R. | - | Ford 20 H.P. | SU 5 | Sussex Road Board | 1916 |
| Katrick | L. | Busselton | Ford 20 H.P. | SJRB 5 | Serpentine Road Board | 1915 |
| Katsiotis | George | Millendon | Overland | SW ● 41 | Swan Road Board | 1927-28 |
| Kau | A. H. | - | Oakland | CU ● 104 | Upper Chapman Road Board | 1926-27 |
| Kau | A. H. | - | Oakland | CU ● 104 | Upper Chapman Road Board | 1927-28 |
| Kaufman | - | Throssell Street, Collie | Hupmobile | CM 20 | Collie Municipality | 1923-24 |
| Kaufman | A. | Metropolitan Dental Co. Perth | Willys-Knight | 4915 | Metro Private Car | 1925-26 |
| Kaufman | A. | Perth | Willys-Knight | 4915 | Metro Private Car | 1926-27 |
| Kaufman | A. | Metropolitan Dental Co, Perth | Willys-Knight | 4915 | Metro Private Car | 1927-28 |
| Kaufman Met. Dental Co | A. | Perth | Willy's Knight | 4915 | Metro Private Car | 1924-25 |
| Kavanagh Bros | - | Cuthbert | Dodge | A ● 16 | Albany Road Board | 1925-26 |
| Kavanagh Bros | - | Cuthbert | Dodge | A ● 16 | Albany Road Board | 1926-27 |
| Kavanagh Bros | - | Cuthbert | Dodge | A ● 60 | Albany Road Board | 1927-28 |
| Kay | A. | Bindoon | Ford | CH ● 11 | Chittering Road Board | 1924-25 |
