| Coutts | Robert Percy | Goodwood, Donnybrook | 9RC | 1924 |
| Coutts | Robert Percy jun. | Capel River Farm, Goodwood, Donnybrook | RQ5 | 1924 |
| Cova | Dante | Wadderin | 3VA | 1924 |
| Cova | J. | Roe 247, 250, E. Narembeen | 3JC and 49B, 5A | 1962 |
| Coverley | A. A. | 18331, Narembeen | 2TJ and 40A, 49C | 1962 |
| Coverley | H. | Valley Dale Run, Nannup | OO0 and 5B, 3E | 1962 |
| Coverley | W. F. | Lawrel Hall Stud, Canningvale | WF7 and 106B, 11E | 1962 |
| Coverley | Wm. F. | Commonage, Bridgetown | WF7 | 1912 |
| Coverley | Wm. F. | Commnage, Bridgetown | WF7 | 1924 |
| Covert | Wm. H. | Townsite Paddock, Albany | 4HC | 1912 |
| Covert | Wm. H. | Townsite Paddock, Albany | 4HC | 1924 |
| Cowan | H., G. & F. | Hillsview, Geraldton | FC9 | 1962 |
| Cowan | Helen, Gerard, & Frank | Hillsview, Geraldton | FC9 | 1924 |
| Cowan | Rosa Howard | Hillsview, Crowther | HC7 | 1912 |
| Cowan | Rosa Howard | Hillsview, Crowther | HC7 | 1924 |
| Cowan | T. A. | Hurtle Vale, Highbury | T0 C | 1912 |
| Cowan | W. | Kwelkan, via Merredin | CX4 | 1924 |
| Cowan | W. D. | Lots 49, 50, 51, 52, York | 1CN | 1912 |
| Cowan | W. D. | Lots 49-52, York | 1CN | 1924 |
| Cowan & Co. | - | Glenelg, Narembeen | 1CN and 15B, 40A | 1962 |
| Cowan & Gerard | Helen & Frank | Hillsview, Geraldton | FC9 | 1912 |
| Coward | John | Woodlands, Upper Blackwood | CT2 | 1924 |
| Coward | John | Sunnyside Farm, Southern Cross Post Office | J5G | 1926 |
| Cowarna Downs Pty. Ltd. | - | Cowarna Downs, Randalls | SN7 and 11C, 6E | 1962 |
| Cowcher | A. R. | Daylarking, Williams | WT1 and 17C, 6A | 1962 |
| Cowcher | A. S. | Josbury, Williams | 4UC and 110A, 48B | 1962 |
| Cowcher | B. H. | Boraning, via Williams | B5C and 116D, 49E | 1962 |
| Cowcher | C. E. R. S. | Quaindering, Williams | 1CH and 18B, 14A | 1962 |
| Cowcher | C. H. | Red Hill, Williams River | 1CH | 1912 |
| Cowcher | C. H. | Red Hill, Williams River | 1CH | 1924 |
| Cowcher | E. A. | Kulbin, Williams | K2C | 1912 |
| Cowcher | E. A. | Kulbin, Williams | K2C | 1924 |
| Cowcher | E. G. | Woodburne, Narrogin | E7C | 1912 |
| Cowcher | E. G. | Woodburne, Narrogin | E7C | 1924 |
| Cowcher | F. A. | N. & J., Williams | F4C and 29B, 26A | 1962 |
| Cowcher | G. F. S. | Culbin, via Williams | K2C and 31D, 28E | 1962 |
| Cowcher | G. S. F. | Doorening, Williams | F2C | 1912 |
| Cowcher | G. S. F. | Doorening, Williams | F2C | 1924 |
| Cowcher | H. F. S. | Dookening, Williams | 4CF and 18A, 16B | 1962 |
| Cowcher | H. S. | Marling, Williams | 7HC and 59F, 20C | 1962 |
| Cowcher | H. T. | Marling, Williams | 7HC | 1912 |
| Cowcher | H. T. | Marling, Williams | 7HC | 1924 |
| Cowcher | Henry | Moorapullin, Marradong | 2CJ | 1912 |
| Cowcher | Henry | Moorapullin, Marradong | 2CJ | 1924 |
| Cowcher | K. R. | Marling, Williams | KC7 and 34B, 20E | 1962 |
| Cowcher | L. S. | Josbury & Lyndhurst, Williams | RC3 and 18B, 4A | 1962 |
| Cowcher | M. E. | Dookening, Williams | MC6 and 14D, 111E | 1962 |
| Cowcher | Mary A. | River View, Marradong | 7AC | 1912 |
| Cowcher | Mary A. | River View Marradong | 7AC | 1924 |
| Cowcher | P. J. S. | Janjanning & Locs. 1037, 1358, 1250-1, 1357, 942, 203, 8908, 4972, 449, Gerralying | J2R and 11B, 116A | 1962 |
