| 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 |
| Kay | A. | Bindoon | Ford | CH ● 11 | Chittering Road Board | 1925-26 |
| Kay | A. | Bindoon | Ford | CH ● 11 | Chittering Road Board | 1926-27 |
| Kay | A. | Bindoon | Ford | CH ● 11 | Chittering Road Board | 1927-28 |
| Kay | C. | Harrismith | Ford | RE ● 42 | Roe Road Board | 1925-26 |
| Kay | G. R. | 1224 Hay Street, Perth | Citroen | 198 | Metro Private Car | 1925-26 |
| Kay | G. R. | 1224 Hay Street, West Perth | Ford Wagon | 14096 | Metro Private Car | 1926-27 |
| Kay | G. R. | 1250 Hay Street, Perth | Studebaker | 198 | Metro Private Car | 1926-27 |
| Kay | G. R. | 1224 Hay Street, Perth | Citroen | 198 | Metro Private Car | 1926-27 |
| Kay | G. R. | 1224 Hay Street, West Perth | Ford Wagon | 5120 | Metro Private Car | 1927-28 |
| Kay | Gordon R | 1224 Hay Street, West Perth | Citroen | 5134 | Metro Private Car | 1927-28 |
| Kay | J. | Baandee | Buick | KE ● 76 | Kellerberrin Road Board | 1924-25 |
| Kay | J. | C/o Kiesey's Lime Kilns Fremantle | Ford | 9201 | Metro Private Car | 1925-26 |
| Kay | J. | Baandee | Buick | KE ● 76 | Kellerberrin Road Board | 1925-26 |
| Kay | J. | Baandee | Buick | KE ● 76 | Kellerberrin Road Board | 1926-27 |
| Kay | J. | Baandee | Buick | KE ● 76 | Kellerberrin Road Board | 1927-28 |
| Kay | N. C. | 214 Redfern Street, North Perth | Essex | 7955 | Metro Private Car | 1925-26 |
| Kay | N. C. | 214 Redfern Street, North Perth | Essex | 7955 | Metro Private Car | 1926-27 |
| Kay | Oliver | Harrismith | Ford | KU ● 53 | Kulin Road Board | 1926-27 |
| Kay | R. | 57 Newcastle Road, Midland Junction | Ford | 1509 | Metro Private Car | 1923-24 |
| Kay | R. | 57 Newcastle Street, Midland Junction | Ford | 1509 | Metro Private Car | 1924-25 |
| Kay | R. | 57 Newcastle Street, Midland Junction | Ford | 1509 | Metro Private Car | 1925-26 |
| Kay | R. | 57 Newcastle Street, Midland Junction | Ford | 1509 | Metro Private Car | 1926-27 |
| Kay | R. | 57 Newcastle Street, Midland Junction | Ford | 1509 | Metro Private Car | 1927-28 |
| Kay | W. | Moora | B.S.A. | M 4 | Moora Road Board | 1919 |
| Kay | Winifred K. | 2nd Avenue, South Perth | Rugby | 1320 | Metro Private Car | 1927-28 |
| Kaye | A. | Meekatharra | Ford Truck | MK ● 25 | Meekatharra Road Board | 1927-28 |
| Kaye | G. J. | 477 Carles Street, North Perth | Ford Wagon | 4524 | Metro Private Car | 1927-28 |
| Kaye | W. | 37 Cowle Street, North Perth | Studebaker | 3746 | Metro Hire or Trade | 1925-26 |
| Kaynes | - | Bunbury | Fiat | BY 69 | Bunbury Municipality | 1926-27 |
| Kayton | G. | Goomalling | Ford | GO ● 83 | Goomalling Road Board | 1924-25 |
| Keading | F. W. | - | Dodge | M ● 28 | Moora Road Board | 1927-28 |
| Kealiy | T. | Fairbridge Farm School | Rugby | MY ● 194 | Murray Road Board | 1926-27 |
| Keall | E. C. D. | Preston | Ford | PE ● 131 | Preston Road Board | 1927-28 |
| Keall | Mrs A. | 70 King's Park Road, West Perth | Armstrong-Sidd | 951 | Metro Private Car | 1927-28 |
| Kealley | E. | Narrogin | B.S.A. 4¾ H.P. | NGN 7 | Narrogin Municipality | 1919 |
| Kealley | E. B. S. A. | Narrogin | B.S.A. 4¾ H.P. Motorcycle | NGN 7 | Narrogin Municipality | 1917-18 |
