| Cooper Bros | - | Chosen Heights, Balingup | D3N and 2C, 36A | 1962 |
| Coops | J. & E. J. | Green Willows, Boddington | CJ6 and 19D, 50E | 1962 |
| Coops | James sen. | Lot 1715, Buckingham Siding | UP6 | 1924 |
| Cooralya Pastoral Co. | - | Cooralya Station, via Carnarvon | 1MU | 1927 |
| Coorinja Vineyard Co. | - | Coorinja, via Toodyay | 3CV | 1924 |
| Coote | C. M. | Loc. 347, Peel Estate | YU5 | 1924 |
| Coote | J. O. | Connemara Downs, Dale River | JO3 and 105A, 26B | 1962 |
| Coote | W. G. | Shannon's Soak, Katanning | C7T | 1912 |
| Coote | W. G. | Shannon's Soak, Katanning | C7T | 1924 |
| Cooya Pooya Pastoral Co. | - | Cooya Pooya Station, Roebourne | Z7O and 44B, 14A | 1962 |
| Cope | Ellen | Commonage, Jarrahdale | E8C | 1912 |
| Cope | H. W. | Prospect Farm, Kwollyin | UM5 | 1924 |
| Cope | Harold James | Kelsey Park, Carnamah | O6P | 1924 |
| Cope | Katherine | Commonage, Jarrahdale | E8C | 1924 |
| Copeland | A. K. | Avon Loc. 21365, 23275, 14139, 24387, 15349, Mukinbudin | 1QV and 114E, 15D | 1962 |
| Copeland | D. | Plant. Loc. 3508/4696/6497 Vallies Farm, Napier | 7DC and 11B, 9E | 1962 |
| Copeland | E. M. | Avon Loc. 14146 & 15344, Mukinbudin | E6C and 6C, 110E | 1962 |
| Copeland | M. H. | 15348, 24055, Mukinbudin | M7C and 33D, 10E | 1962 |
| Copeland | T. E. | Greenland, Balingup | ZC2 | 1924 |
| Copelands | E. | Avon Loc. 21365, Mukinbudin | 1QV | 1924 |
| Copeman | F. C. | Avon Locs. 1026-7-78, Narembeen | CF6 and 21C, 115E | 1962 |
| Copeman | S. & E. | Esco, Bullsbrook | SE0 and 41B, 115E | 1962 |
| Copestake & Co. | A. H. | Somerset, Corrigin | CA5 and 113A, 72B | 1962 |
| Copley | B. | 1452, Esperance | 0VL and 102D, 117E | 1962 |
| Copley | Benjamin | Oscar Range, Derby, Karbar Station, near Yalgoo | 0RS | 1924 |
| Copley | Benjamin | Brooking Station, Fitzroy | BL7 | 1924 |
| Copley | Benjamin | Mt. Barnett Station, W. Kimberley | RO7 | 1924 |
| Copley | Chas. W. H. | Boyanup | 5KO | 1924 |
| Copley | Saml. W. | Woodsome, Upper Swan, Berry Brow, Baker's Hill, Bandear, near Mullewa | SC7 | 1912 |
| Copley | Samuel W. | Woodsome, Upper Swan, Berry Brow, Baker's Hill, Bandear, near Mullewa | SC7 | 1924 |
| Copley Bros. & Patterson | - | Sturt Creek, East Kimberley, Menzies Station, Menzies | 7XX | 1912 |
| Copley Bros. & Patterson | - | Gorda Downs, Derby | CQ2 | 1924 |
| Copp | E. | Hollingbourne Farm 9393, Jardee | Y2K | 1962 |
| Coppard | A. E. | Koogan | 9EK | 1924 |
| Coppin | H. J. (Mrs) | Yarrie Station, Port Hedland | 0CC and 20C, 22A | 1962 |
| Coppin | W. & H. | Egimbah, Port Hedland | C0P | 1912 |
| Coppin | W. H. | Egimbah, Port Hedland | C0P | 1924 |
| Coppin & Co. | C. C. | Clunburn, Northam | C2C and 43C, 13A | 1962 |
| Coppin & Sons | C. | Eel Creek, Port Hedland | 0CC | 1912 |
| Coppin & Sons | C. M. | Eel Creek, Port Hedland | 0CC | 1924 |
| Coral Park Pastoral Co. | - | E. Coral Park, W. Coral Park, N. Dandalup & Brookton | CP8 and 2C, 113E | 1962 |
| Coral Park Pastoral Co. | - | Weebo Station, Leonora | G7G and 46D, 23E | 1962 |
| Corbett | Henry | Avon 14037 and 14038, Newcarnie | Z6F | 1925 |
| Corbett | John | Cr. Bent Street and Guildford Road, Belmont | O4C | 1912 |
| Corbett | John | cr. Bent St. and Guildford Rd., Belmont | O4C | 1924 |
| Corbett | Mary | Bulong Avenue. Redcliffe | O4G | 1928 |
| Corbett | Michael | Telgarup, Broomehill | M9C | 1912 |
| Corbett | Michael | Telgarup, Broomehill | M9C | 1924 |
| Corbett | P. F. | Cranberry, Hines Hill | 8CO | 1924 |
| Corbett | T. W. | Kurrajong, via Menzies | X1Z | 1927 |
