| Jupp | W. O. | - | Gray | CU ● 70 | Upper Chapman Road Board | 1925-26 |
| Jupp | W. O. | - | Gray | CU ● 70 | Upper Chapman Road Board | 1926-27 |
| Jupp | W. O. | - | Ford Truck | CU ● 117 | Upper Chapman Road Board | 1926-27 |
| Jupp | W. O. | - | Ford Truck | CU ● 117 | Upper Chapman Road Board | 1927-28 |
| Jupp | W.F. | Nabawa | Overland 20 H.P. | CU ● 8 | Upper Chapman Road Board | 1917-18 |
| Jupp | Walter O. | - | Essex | CU ● 170 | Upper Chapman Road Board | 1927-28 |
| Jury | W. C. | Nannup | Ford | BL ● 22 | Lower Blackwood Road Board | 1925-26 |
| Jury | W. C. | Nannup | Ford | BL ● 22 | Nannup Road Board | 1926-27 |
| Jussup | W. | Yalgoo | Ford | YA ● 101 | Yalgoo Road Board | 1927-28 |
| Just | Charles | Latham | Chevrolet Truck | PM ● 129 | Perenjori-Morawa Road Board | 1927-28 |
| Just | Charles W. F. | Latham | Ford Truck | PM ● 219 | Perenjori-Morawa Road Board | 1927-28 |
| Justice | T. | Nalya | Ford | BO ● 11 | Brookton Road Board | 1925-26 |
| Justice | T. | Nalya | Ford | BO ● 11 | Brookton Road Board | 1926-27 |
| Justice | T. | Nayla | Ford | BO ● 11 | Brookton Road Board | 1927-28 |
| K.T.C. | - | Barabup | Overland | BL ● 9 | Lower Blackwood Road Board | 1922-23 |
| K.T.C. | - | Barabup | Overland | BL ● 9 | Blackwood (Lower) Road Board | 1923-24 |
| Kaesehagen | - | Bunbury | Studebaker | BY 133 | Bunbury Municipality | 1925-26 |
| Kaeshagen | - | Bunbury | Studebaker | BY 133 | Bunbury Municipality | 1926-27 |
| Kaeshagen | W. | Bunbury | Rover 3½ H.P. Motorcycle | By 14 | Bunbury Municipality | 1916 |
| Kaeshagen | W. H. | Bunbury | Studebaker | BY 133 | Bunbury Municipality | 1927-28 |
| Kahl | J. W. | Kununoppin | Ford | NG ● 19 | Ningham Road Board | 1922-23 |
| Kahl | J. W. | Kunnunoppin | Ford | NG ● 19 | Ninghan Road Board | 1923-24 |
| Kahl | J. W. | Kununoppin | Ford | KTY ● 19 | Kununoppin-Trayning Road Board | 1924-25 |
| Kahl | J. W. | Kununoppin | Ford Truck | KTY ● 65 | Kununoppin-Trayning Road Board | 1924-25 |
| Kahl | J. W. | Kununoppin | Ford Truck | KTY ● 65 | Kununoppin-Trayning Road Board | 1925-26 |
| Kahl | J. W. | Kununoppin | Ford Truck | KTY ● 65 | Kununoppin-Trayning Road Board | 1926-27 |
| Kahl | J. W. | Kununoppin | Ford Truck | KTY ● 65 | Kununoppin-Trayning Road Board | 1927-28 |
| Kaiser | A. | 322 William Street | B.S.A. 3½ H.P. Motorcycle | P 261 | Perth Municipality | 1915 |
| Kaiser | A. | No. 1 State Mill | Chevrolet | WA ● 83 | Manjimup Road Board | 1925-26 |
| Kaiser | A. | No. 1 State Saw Mill | Chevrolet | WA ● 83 | Manjimup Road Board | 1926-27 |
| Kaiser | A. | No. 1 State Saw Mill | Chevrolet | WA ● 83 | Manjimup Road Board | 1927-28 |
| Kaiser | A. B. | Pickering Brook | Hupmobile Truck | DR ● 51 | Darling Range Road Board | 1924-25 |
| Kaiser | A. B. | Carmel | Hupmobile | DR ● 51 | Darling Range Road Board | 1925-26 |
| Kaiser | A. B. | Carmel | Hupmobile | DR ● 51 | Darling Range Road Board | 1926-27 |
| Kaiser | A. B. | Carmel | Overland | DR ● 51 | Darling Range Road Board | 1927-28 |
| Kaiser | G. | 8 Rae Street, Leederville | Chevrolet | 5218 | Metro Private Car | 1925-26 |
| Kak | Ball | Bullaring | Ford | CR ● 32 | Corrigin Road Board | 1923-24 |
| Kalafatas | G. A. | Marine Terrace, Geraldton | Chevrolet | GN 203 | Geraldton Municipality | 1927-28 |
| Kalem | J. | Moora | Hupmobile | M ● 176 | Moora Road Board | 1927-28 |
| Kalf | Percy | East Pingelly | Overland | CN ● 59 | Cuballing Road Board | 1927-28 |
| Kalgoolie & Boulder Firewood Coy. | - | Maritana Street | Buick 15 H.P. | KMC 1 | Kalgoorlie Municipality | 1916 |
| Kalgoolie East Power & Lighting Corporation. | - | - | R.C.H. 12 H.P. | K 6 | Kalgoorlie Road Board | 1916 |
| Kalgoolie Timber & Firewood Co | - | Maritana Street | Buick 16 H.P. | KMC 1 | Kalgoorlie Municipal Council | 1922-23 |
| Kalgoorlie & Boulder Firewood Co | - | - | Ford | MG ● 9 | Mount Margaret Road Board | 1927-28 |
| Kalgoorlie & Boulder Firewood Co | - | - | Ford Truck | MG ● 10 | Mount Margaret Road Board | 1927-28 |
| Kalgoorlie & Ice Co | B. | Brookman Street | Ford Truck | KMC 3 | Kalgoorlie Municipal Council | 1925-26 |
| Kalgoorlie & Ice Co | B. | Brookman Street | Rugby | KMC 68 | Kalgoorlie Municipal Council | 1925-26 |
| Kalgoorlie Brewery | - | Porter Street | Buick 20 H.P. | KMC 55 | Kalgoorlie Municipal Council | 1917-18 |
| Kalgoorlie Brewery | - | Porter Street | Ford 20 H.P. | KMC 68 | Kalgoorlie Municipal Council | 1917-18 |
| Kalgoorlie Brewery | - | Porter Street | (lorry) Buick 27 H.P. | KMC 3 | Kalgoorlie Municipal Council | 1917-18 |
