| Kallishaw | F. | 20 Cantonment Street, Fremantle | Morris Cowley | 12597 | Metro Private Car | 1927-28 |
| Kallman | A. | 372 Lord Street, Perth | Premier | 935 | Metro Motorcycle | 1922-23 |
| Kalmind | A. N. | Wattle Grove Queens Park | Morris-Cowley | 13572 | Metro Private Car | 1926-27 |
| Kalmund | Arthur V | Broadway, Nedlands | Chevrolet Truck | 4829 | Metro Private Car | 1927-28 |
| Kalmunda | A. | Wiluna | Douglas Motorcycle | WU ● 1 | Wiluna Road Board | 1922-23 |
| Kalonowsky | F. F. | Meekatharra | Hupmobile Truck | MK ● 18 | Meekatharra Road Board | 1927-28 |
| Kamman | J. F. | Manjimup | Ford Lorry | WA ● 27 | Manjimup Road Board | 1925-26 |
| Kamman | J. F. | Manjimup | Ford Lorry | WA ● 27 | Manjimup Road Board | 1926-27 |
| Kamman | J. F. | Manjimup | Ford Lorry | WA ● 27 | Manjimup Road Board | 1927-28 |
| Kamman | John F. | Manjimup | Ford Lorry | WA ● 27 | Warren Road Board | 1923-24 |
| Kamman | M. | Manjimup | Chevrolet Truck | WA ● 185 | Manjimup Road Board | 1926-27 |
| Kamman | M. | Manjimup | Chevrolet Truck | WA ● 185 | Manjimup Road Board | 1927-28 |
| Kamman | W. A. | Manjimup | Chevrolet | WA ● 167 | Manjimup Road Board | 1926-27 |
| Kamman | W. A. | Manjimup | Chevrolet | WA ● 167 | Manjimup Road Board | 1927-28 |
| 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 |