| Copley | Q. J. | 9 Forrest Street, Cottesloe | Studebaker | 15804 | Metro Private Car | 1927-28 |
| Copper Separation Co Ltd | - | Saint George's Terrace, Perth | Studebaker | 4436 | Metro Private Car | 1923-24 |
| Copper Separation Co Ltd | - | Saint George's Terrace, Perth | Studebaker | 4436 | Metro Private Car | 1924-25 |
| Copper Separation Ltd | - | Kundip | Studebaker | PR ● 10 | Phillips River Road Board | 1925-26 |
| Copper Seperation Co Ltd | - | Saint George's Terrace | Studebaker | 4436 | Metro Private Car | 1925-26 |
| Coram | B. W. | Newdegate | Ford Truck | LG ● 122 | Lake Grace Road Board | 1927-28 |
| Corke | P. T. | Bakers Hill | Dodge | N ● 145 | Northam Road Board | 1926-27 |
| Cornich | A. | Armadale | B.S.A. and side-car 4¼ H.P. Motorcycle | A-K ● 2 | Armadale-Kelmscott Road Board | 1919 |
| Cornish | A. | Armadale | B.S.A. 4½ H.P. Motorcycle & Sidecar | A-K ● 2 | Armadale-Kelmscott Road Board | 1917-18 |
| Cornish | A. | Armadale | B.S.A. 4½ H.P. Motorcycle & Sidecar | A-K ● 2 | Armadale-Kelmscott Road Board | 1922-23 |
| Cornish | A. | Armadale | Belsize | A-K ● 8 | Armadale-Kelmscott Road Board | 1924-25 |
| Cornish | Albert | Albany | Triumph 3½ H.P. Motorcycle Motorcyle | A-K 2 | Armadale-Kelmscott Road Board | 1915 |
| Cornish | Albert | Armadale | B.S.A. 4¼ H.P. Motorcycle | A-K 2 | Armadale-Kelmscott Road Board | 1916 |
| Cornish | Albert | Armadale | Belsize | A-K ● 8 | Armadale-Kelmscott Road Board | 1923-24 |
| Cornish | KEN | Wandering | Ford | WD ● 43 | Wandering Road Board | 1926-27 |
| Cornish | Ken | Wandering | Whippet | WD ● 43 | Wandering Road Board | 1927-28 |
| Cornwall | Miss H | Leake Street, Peppermint Grove | Citroen | 8320 | Metro Private Car | 1927-28 |
| Cornwall | Miss H. | Leake Street, Peppermint Grove | Citroen | 8320 | Metro Private Car | 1926-27 |
| Cornwall | T. J. | Beaufort, via Wagin | Studebaker 30 H.P. | W 5 | Wagin Road Board | 1916 |
| Cornwall | T. J. | Wagin | Studebaker | W ● 5 | Wagin Road Board | 1923-24 |
| Cornwall | T. J. | Ballaying | Studebaker | W ● 5 | Wagin Road Board | 1925-26 |
| Cornwall | T. J. | Wagin | Studebaker | W ● 5 | Wagin Road Board | 1927-28 |
| Cornwell | H. | Leake Street, Cottesloe | Ford | 6125 | Metro Private Car | 1924-25 |
| Cornwell | H. | Leake Street, Cottesloe | Rugby | 6125 | Metro Private Car | 1925-26 |
| Cornwell | T. J. | Wagin | Studebaker 30 H.P. | W ● 5 | Wagin Road Board | 1922-23 |
| Cornwell | T. J. | Wagin | Studebaker | W ● 5 | Wagin Road Board | 1926-27 |
| Cosh | E. C. | Minnivale | Studebaker | D ● 37 | Dowerin Road Board | 1927-28 |
| Cosh | S. | Kellerberrin | Buick | KE ● 65 | Kellerberring Road Board | 1923-24 |
| Couper | J. K. | Dowerin | Studebaker | D ● 39 | Dowerin Road Board | 1926-27 |
| Couper | J. K. | Dowerin | Studebaker | D ● 39 | Dowerin Road Board | 1927-28 |
| Courbouies | John | Bilbarin | Studebaker | CR ● 11 | Corrigin Road Board | 1927-28 |
| Courtney | G. A. | 287 Barker Street, Subiaco | Renault | 1381 | Metro Private Car | 1922-23 |
| Courtney | G. H | Armadale | B.S.A. and side-car 4¼ H.P. Motorcycle | A-K ● 5 | Armadale-Kelmscott Road Board | 1919 |
| Courtney | G. H. | Armadale | B.S.A. 4½ H.P. Motorcycle & Sidecar | A-K ● 5 | Armadale-Kelmscott Road Board | 1917-18 |
| Cowan | A. | 291 Rokeby Road, Subiaco | Chevrolet Wagon | 13570 | Metro Private Car | 1926-27 |
| Cowan | A. | 291 Rokeby Road, Subiaco | Chevrolet Wagon | 13570 | Metro Private Car | 1927-28 |
| Cowan | A. W. | 291 Rokeby Road, Subiaco | Chevrolet Wagon | 3646 | Metro Hire or Trade | 1926-27 |
| Cowan | A. W. | 291 Rokeby Road, Subiaco | Chevrolet Wagon | 3646 | Metro Hire or Trade | 1927-28 |
| Cox | D. J. | Throssell Street | Studebaker | CM ● 12 | Collie Municipality | 1922-23 |
| Cox | D. J. | Throssell Street | Studebaker | CM 12 | Collie Municipality | 1923-24 |
| Cox | F. | Kellerberrin | Ford | KE ● 85 | Kellerberrin Road Board | 1924-25 |
| Cox | F. | Kellerberrin | Ford | KE ● 85 | Kellerberrin Road Board | 1925-26 |
| Cox | F. | Kellerberrin | Dodge | KE ● 85 | Kellerberrin Road Board | 1926-27 |
| Cox | F. W. | Kalgoorlie Municipal Council | Studebaker | KMC 100 | Kalgoorlie Municipal Council | 1922-23 |
| Cox | F. W. | Kalgoorlie Municipal Council | Studebaker | KMC ● 100 | Kalgoorlie Municipality | 1923-24 |
| Cox | F. W. | Kalgoorlie Municipal Council | Studebaker | KMC 100 | Kalgoorlie Municipality | 1924-25 |
| Cox | F. W. | Kalgoorlie Municipal Council | Studebaker | KMC 100 | Kalgoorlie Municipal Council | 1925-26 |
| Coyle | D. | Dudinin | Overland | WK ● 126 | Wickepin Road Board | 1925-26 |
| Coyle | D. J | Dorakin | Ford | WK ● 126 | Wickepin Road Board | 1926-27 |
| Crabb | J. F. | 134 Vincent, Street Perth | Studebaker | 3028 | Metropolitan Hire and Trade Cars | 1923-24 |
