| Clarkson Bros. | - | Tyford, Dongarra | V1E | 1924 |
| Clarkson Bros. Ltd. | - | Golden Valley, via Bullfinch | 3OU | 1924 |
| Clarkson, Sons & McSwain | - | Lakeside Station, Cue | C4N | 1924 |
| Clasen Bros. | - | Roe Locs. 1640-41, Mt. Madden | HC3 and 37C, 16E | 1962 |
| Claughton | W. H. | Narrogin | 9WC | 1924 |
| Clausen | K. O. | Valahalla, Mt. Helena | FC7 and 32B, 56F | 1962 |
| Clausen | R. J. | Belview, Yelbeni | NJ4 and 19B, 84E | 1962 |
| Clauson | P. G. | Lyon's Court, Badgermmup | 4NY | 1924 |
| Clay | N. | Claysville, Donnybrook | TG3 | 1962 |
| Clay | T. S. | Clayesville, Donnybrook | TG3 | 1912 |
| Clay | T. S. | Clayesville, Donnybrook | TG3 | 1924 |
| Clayden | J. T. | Loc. 8204, Wooroloo | 3TN | 1924 |
| Claydon | Ernest W. | Rockdale, E. Pingelly | 7EZ | 1924 |
| Claydon | Robert | Broomehill, Broomehill | RC0 | 1912 |
| Claydon | W. G. | Craig-y-deryn Farm, Pingelly | CG9 | 1912 |
| Claydon | W. G. | Craig-y-deyn Farm, Pingelly | CG9 | 1924 |
| Clayton | A. C. & B. A. | Wirraninua, Perenjori | 8AC and 5B, 114E | 1962 |
| Clayton | C. F. | Rosa Brook | MT7 | 1962 |
| Clayton | D. | Slaughter Yards, Yarloop | 2KD | 1924 |
| Clayton | H. T. & G. J. | Mt. St. Clare, Lowden | HC6 and 45A, 23B | 1962 |
| Clayton | H. V. & E. M. | Kurrajous Roe 1033-1096, Hyden | HV2 and 24B, 48E | 1962 |
| Clayton | J. M. | Woolgning, Kulin | JC0 and 11C, 16A | 1962 |
| Clayton | John E. | Ferndale Farm, Narrogin | O3C | 1924 |
| Clayton | L. R. | Harvey | XP4 | 1924 |
| Clayton | M. | Mantonville, Broomchill | RC0 and 14A, 41B | 1962 |
| Clayton | Robert | Broomehill | RC0 | 1924 |
| Clayton & Rawlee | E. E. & A. T. | Kalamunda, Maida Vale | C8R and 117B, 119A | 1962 |
| Clayton & Son | E. | Loc. 2230, 2231, 2232, 2233, Cowaramup | YD4 | 1962 |
| Clayton & Son | R. & L. | Glenoric, Hyden | 1RC and 48E, 22B | 1962 |
| Clayton-Smith | R. J. | Ninghan 3120, Wialki | SR2 and 36D, 31E | 1962 |
| Cleary | Michael | Homestead, Roelands | 0CM | 1912 |
| Cleary | Michael | Homestead, Roelands | 0CM | 1924 |
| Cleary | T. P. | Texas, Wyndham | TP1 | 1912 |
| Cleary | T. P. | Texas, Wyndham | TP1 | 1924 |
| Cleave & Co. | W. R. | Tregaina, Pemberton | 9WC and 108B, 4A | 1962 |
| Clegg | C. R. & C. | Alderley, Kojonup | C8C and 37E, 25D | 1962 |
| Clegg | Edward A. | Wyresdale, Lake Pingrup, Nampup, via Katanning | CE0 | 1924 |
| Clegg | Ernest A. | Badgebup, E. Katanning | OE3 | 1924 |
| Clegg | Wm. | Reedley Farm, Peel Estate, Jandakot | 4UG | 1924 |
| Clegg & Sons | - | Badjebup, E. Katanning | CE0 and 21C, 11A | 1962 |
| Cleggett | G. H. | Burrow Yocking, Cunderdin | 8WM | 1924 |
| Cleland | Alexander | Hamilton Farn, Perenjori | AG3 | 1927 |
| Cleland | G. | Hamilton Farm & Gracemore, Perenjori | AC3 and 41B 18E | 1962 |
| Clemens | A. M. | Kartanarra, Dangin | CH7 and 39C, 35E | 1962 |
| Clemens | E. L. & M. M. | Nookawarra, Quairading | V0C and 14B, 42A | 1962 |
| Clemens | Est. of H. B. | Goolawalla, Dangin | 2CL and 48A, 39C | 1962 |
| Clemens | H. H. | Hillside, Dangin | CH7 | 1912 |
| Clemens | H. H. | Hillside, Dangin | CH7 | 1924 |
| Clemens | V. L. | Killarney, Quairading | 1VL and 119A, 17B | 1962 |
| Clement | Wm. | Brookside-Talbot, York | W3C | 1912 |
