| Castle | Arthur E. | Blocks 19294 and 18359, Narembeen | C5Q | 1924 |
| Castle | D. G. & A. M. | Moorundie, Kojonup | WC1 and 41E, 22D | 1962 |
| Castle | F. G. | Strathalbyn, 125 Gate, East Dumbleyung | F7C | 1912 |
| Castle | F. G. | Strathalbyn, 125 Gate, East Dumbleyung | F7C | 1924 |
| Castle | F. G. | Strathalyn, Moulyinning | F7C and 2C, 9E | 1962 |
| Castle | F. V. | Sussex Locs. 2471, Karridale | VC0 | 1962 |
| Castle | R. S. | Sussex Loc. 2710, Forest Grove | YJ6 and 120B, 23A | 1962 |
| Castle | Rowland | Loc. 9787, Lake Pingarup | 1RQ | 1924 |
| Castle | Thos. | Castledene, Kirupp | O7C | 1912 |
| Castle | Thos. | Castledene, Kirup | O7C | 1924 |
| Castle | W. D. | Blocks 7103, 7104, 8000, 118 Gate, Dumbleyung | 9DC | 1912 |
| Castle | W. D. | Blocks 7103-4, 8000, 118 Gate, Dumbleyung | 9DC | 1924 |
| Castle | W. D. | Wungong 53, 56, 57, 58, Armadale | 9DC | 1962 |
| Castle | Walter W. | Moorundie, Muradup | WG1 | 1927 |
| Castledare Boys Home | - | Castledare, Queens Park | 9CD and 102B, 117A | 1962 |
| Castledene | M. T. | State Battery, Pig Well | G9C | 1912 |
| Castledine | C. J. | Randwick G.M. | CC1 | 1924 |
| Castledine | C. Jas. | Randwick G.M. | CC1 | 1912 |
| Castledine | Florence | Edenhope, Waeel | 0FU | 1924 |
| Castledine | M. T. | State Battery, Pig Well | G9C | 1924 |
| Castlemain | H. C. & M. M. | Ning. Loc. 2538, Cadoux | W4S and 7C, 71E | 1962 |
| Castles | F. | Hall's Creek, East Kimberley | H7Y | 1912 |
| Castles | F. | Hall's Creek | H7Y | 1924 |
| Castro | M. | 8094, 8507, 2423, 2215, Kirup | 6CM | 1962 |
| Catchpole | H. J. | Common, Ora Banda | KO9 | 1924 |
| Catchpole | H. J. | 395/930, Ora Banda | KO9 and 119B, 9E | 1962 |
| Caterer | M. M. & E. J. | Plant. 3933, 3934, Borden | 7BC and 38B, 39A | 1962 |
| Catheray | George | Pastoral Lease 3225/102, Sir Samuel | GC0 | 1912 |
| Catheray | George | P.L. 3225/102, Sir Samuel | GC0 | 1924 |
| Cathng & Co. | - | Carramar, Katanning | T0M and 20B, 40A | 1962 |
| Catt | F. A. & E. A. | 696, 3907, 3403, 3538, Youngs Siding, via Albany | F0E and 40E, 29D | 1962 |
| Cattach | P. H. | 204-205, Harvey | 7QC | 1962 |
| Cattach | P. S. | Townsite, Yarloop | 7QC | 1924 |
| Cattach & Sons | W. B. | Hamhill, Kondinin | 9GA and 67E, 32C | 1962 |
| Cattach & Sons | W. B. | Spring Creek Lot 41, Yarloop | AG9 and 22C, 33E | 1962 |
| Catto | George | Lot 4, Inering Estate, Carnamah | KG6 | 1924 |
| Catto | K. F. | Piyowola, Carnamah | KG6 and 10B, 44A | 1962 |
| Catto & Sons | K. F. | Hillview, Morawa | 7KG and 37D, 3E | 1962 |
| Caudwell | E. | Aiedale Farm, Youngs Siding, via Albany | C6Z | 1962 |
| Caughey | F. C. & C. F. | Cairnmore, Merredin | M4Q and 45D, 105E | 1962 |
| Caughey | L. & F. | Locs. 11075 &10073, Nokaning | 8CJ and 43D, 31E | 1962 |
| Caulfield | D. M. E. | Avon 19984, Dowerin | MD6 and 46B, 22E | 1962 |
| Caulfield | Michael | Nambling, Box 50, Dowerin | M4G | 1927 |
| Caulson | E. | Tarrawarra Farm, Knungajen | 8CE | 1912 |
| Caulson | E. | Tarrawarra Farm, Knungajen | 8CE | 1924 |
| Cavalier | Francis C. | Temble Hollow, Balingup | L8Q | 1925 |
| Cavanagh | A. N. | Gabyinda, Kojonup | NC5 and 45B, 26A | 1962 |
| Cavanagh | C. O. | Avon 27208, S. Kumminin | CC5 and 103A, 38C | 1962 |
| Cavanagh | Gordon James | Yilgarn Loc.226, North Burracoppin | GG7 | 1926 |
| Cavanagh | H. E. | Wandibirrup, West Wagin | W3P and 9B, 17E | 1962 |
