| Knuckey | W. | Carnarvon | B.S.A. 12-15 H.P. | CN 3 | Carnarvon Municipality | 1917-18 |
| Knuckey | W. | Carnarvon | Hupmobile 30 H.P. | CN 3 | Carnarvon Municipality | 1919 |
| Knuckey | W. | Carnarvon | Overland 15 H.P. | CN 15 | Carnarvon Municipality | 1919 |
| Knuckey | W. | Carnarvon | Ford | CN 27 | Carnarvon Municipal Council | 1924-25 |
| Knuckey | W. | Carnarvon | Rugby | CN 81 | Carnarvon Municipal Council | 1926-27 |
| Knuckley | W. | Goomalling | Rugby | GO ● 247 | Goomalling Road Board | 1927-28 |
| Knudson | K. | Base Hospital | F.M. 2¾ Motorcycle | F 93 | Fremantle Municipal Council | 1917-18 |
| Kochner | E. A. | Minnievale | Ford | D ● 38 | Dowerin Road Board | 1923-24 |
| Kochner | E. A. | Minnivale | Ford | D ● 38 | Dowerin Road Board | 1924-25 |
| Kochner | E. A. | Minnivale | Cleveland | D ● 38 | Dowerin Road Board | 1925-26 |
| Kochner | E. A. | Minnivale | Cleveland | D ● 38 | Dowerin Road Board | 1926-27 |
| Kochner | E. A. | Minnivale | Cleveland | D ● 38 | Dowerin Road Board | 1927-28 |
| Kodak Australasia Ltd | - | 672 Hay Street, Perth | Dodge | 5840 | Metro Private Car | 1924-25 |
| Kodak Australasia Ltd | - | 672 Hay Street | Dodge | 5840 | Metro Private Car | 1925-26 |
| Kodak Ltd | - | 672 Hay Street, Perth | Dodge | 11307 | Metro Private Car | 1926-27 |
| Kodak Ltd | - | 672 Hay Street, Perth | Dodge | 11307 | Metro Private Car | 1927-28 |
| Koehene | H. D. | 141 Fitzgerald Street, Perth | Excelsior | 101 | Metro Motorcycle | 1922-23 |
| Koehne | H. D. | 141 Fitzgerald Street, North Perth | Indian | 357 | Metro Motorcycle | 1922-23 |
| Koehne | Rev D. | Katanning | Citroen | KA ● 276 | Katanning Road Board | 1927-28 |
| Koehne | Rev. D. | Katanning | Citroen | KA ● 276 | Katanning Road Board | 1926-27 |
| Koeppe | F. | 23 Longroyd Street, Mount Lawley | Chevrolet | 7814 | Metro Private Car | 1925-26 |
| Koeppe | F. H. | 23 Longroyd Street, Mount Lawley | Overland | 5505 | Metro Private Car | 1924-25 |
| Koeppe | F. W. | Dalwallinu | Chevrolet | DL ● 152 | Dalwallinu Road Board | 1926-27 |
| Koeppe | F. W. | Dalwallinu | Chevorlet | DL ● 152 | Dalwallinu Road Board | 1927-28 |
| Kohler | R. | Jitarning | Chevrolet Truck | KU ● 209 | Kulin Road Board | 1927-28 |
| Koliman | H. | 64 Brisbane Street | Triumph 3½ H.P. Motorcycle | P 552 | Perth Municipality | 1916 |
| Koll | L. W. | Bunbury | Chevrolet | BY 23 | Bunbury Municipality | 1926-27 |
| Kollmann | A. | 64 Brisbane Street | Triumph 3½ H.P. Motorcycle | P 552 | Perth Municipality | 1915 |
| Kondinin Co-op | - | Kondinin | Chevrolet | KN ● 90 | Kondinin Road Board | 1927-28 |
| Kondinin Co-op. | - | Kondinin | Ford | KN ● 71 | Kondinin Road Board | 1926-27 |
| Kondinin Road Board | - | Kondinin | Crossley Truck | KN ● 147 | Kondinin Road Board | 1927-28 |
| Kookynie Pastoral Co | - | Kookynie | Dodge | MN ● 51 | Menzies Road Board | 1927-28 |
| Koomarra Pastoral Co | - | Meekatharra | Ford | MK ● 55 | Meekatharra Road Board | 1927-28 |
| Kopke | F. | 304 Fitzgerald Street, Perth | Overland 27 H.P. | P 198 | Perth Municipality | 1916 |
| Kopke | F. | 304 Fitzgerald Street | Dodge 20 H.P. | P 114 | Perth Municipality | 1917-18 |
| Kopke | F. A. | 304 Fitzgerald Street | Overland 27 H.P. | P 198 | Perth Municipality | 1917-18 |
| Kopke | F. A. | 304 Fitzgerald Street | Overland 25 H.P. | P 198 | Perth Municipality | 1919 |
| Kopke | F. A. | 66 Lawley Crescent, Mount Lawley | Willy's-Knight | 390 | Metro Private Car | 1923-24 |
| Kopke | F. A. | 66 Lawley Crescent, Mount Lawley | Willys-Knight | 390 | Metro Private Car | 1925-26 |
| Kopke | F. A. | 66 Lawley Crescent, Mount Lawley | Willys-Knight | 390 | Metro Private Car | 1926-27 |
| Kopke | F. A. | 66 Lawley Crescent, Mount Lawley | Willys-Knight | 390 | Metro Private Car | 1926-27 |
| Kopke | Fred A. | 65 Lawley Crescent, Mount Lawley | Willys-Knight | 390 | Metro Private Car | 1922-23 |
| Kornbeibel | Albert | Wellington Street, Cottesloe Beach | Chevrolet | 2830 | Metro Private Car | 1927-28 |
| Korner | R. C. | 32 Charles Street, South Perth | Chevrolet | 12823 | Metro Private Car | 1927-28 |
| Korrelocking Co-op. | - | Korrelocking | Essex | WM ● 88 | Wyalkatchem Road Board | 1924-25 |
| Korrelocking Co-op. | - | Korrelocking | Essex | WM ● 88 | Wyalkatchem Road Board | 1925-26 |
| Korrelocking Co-op. | - | Korrelocking | Essex | WM ● 88 | Wyalkatchem Road Board | 1926-27 |
| Korsunski | Geo. | 197 Lake Street, Perth | Gray Wagon | 9419 | Metro Private Car | 1927-28 |
| Korunski | G. | 197 Lake Street, Perth | Overland | 8703 | Metro Private Car | 1926-27 |
| Korunski | G. | 197 Lake Street, Perth | Gray Wagon | 9419 | Metro Private Car | 1926-27 |
