| Clifton | R. G. | Plant. Loc. 5210, Narrikup | CX8 and 108A, 71C | 1962 |
| Clifton | R. L. | The Homestead, Harvey | CV3 | 1962 |
| Clifton | Reginald | Wokalup, Wokalup | RC2 | 1912 |
| Clifton | Reginald | Wokalup | RC2 | 1924 |
| Clifton | Violet Rose | Resamel, Australind | EC6 | 1912 |
| Clifton & Co. | A. F. | Alverstoke, Brunswick Junction | 4AC and 6C, 18E | 1962 |
| Clifton & Son | J. E. M. | Rosamel, Australind | 4EC | 1912 |
| Clifton & Son | J. E. N. | Rosamel, Australind | 4EC | 1924 |
| Clifton Bros. | - | Cave Hill 8, 9, 10, 18, 65, 66, 66, 69, Gwambygine | CV0 and 14D, 22E | 1962 |
| Climie | H. S. | Strathmore, Cranbrook | S3C | 1912 |
| Climie | H. S. | Strathmore, Cranbrook | S3C | 1924 |
| Climie | Hugh | Vallochenyle | 9XC | 1924 |
| Climie & Son | H. S. | Strathmore, Cranbrook | S3C and 7B, 23E | 1962 |
| Clinch | A. | Coodingnow Station, Paynes Find | C7A and 10A, 6B | 1962 |
| Clinch | A. C. | Burnerbinmah Station, Mt. Magnet | 4CQ | 1962 |
| Clinch | A. J. | Edawa and Karamara, Walebing | H2L | 1912 |
| Clinch | A. J. | Edawa & Karamara Walebing | H2L | 1924 |
| Clinch | A. J. | Edawa, & Karamara, Walebing | H2L | 1962 |
| Clinch | Albert C. | Burnerbinmah Station, via Mt. Magnet | 4CQ | 1924 |
| Clinch | Arthur | Mill Villa Farm, Greenough | C6C | 1912 |
| Clinch | Arthur | Mill Villa Farm, Greenough | C6C | 1924 |
| Clinch | B. M. | Donaville, Greenough | F1C and 3D, 5E | 1962 |
| Clinch | C. J. | Chelsea, Moora | CC6 | 1912 |
| Clinch | C. J. | Milgoo Peak Stn. Fields's Find, via Yalgoo | CO9 | 1912 |
| Clinch | C. J. | Chelsea, Moora | CC6 | 1924 |
| Clinch | C. J. | Milgoo Peak Station, Field's Find, via Yalgoo | CO9 | 1924 |
| Clinch | F. C. | Burnerbinwah, Yalgoo | FC6 | 1912 |
| Clinch | F. E. M. | Donaville, Greenough | F1C | 1912 |
| Clinch | F. E. M. | Donaville, Greeough | F1C | 1924 |
| Clinch | F. G. & W. H. | Spring Park Station, via Youanme | A1E | 1924 |
| Clinch | Frank G. | Burnerbinmah Station, via Mt. Magnet | 1FK | 1924 |
| Clinch | Mrs Jane | Burnerbinmah Station, via Mt. Magnet | KU1 | 1924 |
| Clinch | P. | Coodingnow Station, via Wubin | P1C | 1962 |
| Clinch | T. | Central Greenough, Greenough | TC6 | 1912 |
| Clinch | T. | Greenough | TC6 | 1924 |
| Clinch | T. A. | Lake More, Field's Find via Yalgoo | C1V | 1912 |
| Clinch | T. A. | Lake More, Field's Find, Yalgoo | C1V | 1924 |
| Clinch | W. R. | West End Estate, Moora | W1C | 1912 |
| Clinch | W. R. | West End Estate, Moora | W1C | 1924 |
| Clinch & Co. | A. C. | Burnerbinmah and Kadunga, Mt. Magnet and E. Cannington | FC6 and 13A, 2C | 1962 |
| Clinton | Alfred Henry | Claymore | 8AG | 1926 |
| Clipston | J. J. | Hotham Vale Estate, Pingelly | HV5 | 1912 |
| Clipston | J. J. | Hotham Vale Estate, Pingelly | HV5 | 1924 |
| Clode | H. S. | Barrama (1131), Denbarker, via Mt. Barker | SH0 and 113E, 44C | 1962 |
| Clontarf Boys Orphanage | - | Clontarf, Victoria Park | C2O | 1912 |
| Clontarf Boys' Orphanage | - | Clontarf, Victoria Park | C2O | 1924 |
| Clontarf Boys' Orphanage | - | Clontarf, Victoria Park | C2O and 32C, 43E | 1962 |
| Close | F. C. | Sylvania, Wannamal | CF9 | 1912 |
| Close | F. C. | Sylvania, Wannamal | CF9 | 1924 |
| Closter | J. W. C. | Avon Block 13963, Burracoppin | U0C | 1924 |
