| Cook | W. C. | Cooklands, Guildford Road, Bayswater | W4C | 1924 |
| Cook | W. J. A. | Fair Bank Farm, East Pingelly | 7CK | 1912 |
| Cook | W. J. A. | Fairbank Farm, E. Pingelly | 7CK | 1924 |
| Cook | W. T. | Helena 22 Chidlow | 8TC and 47A, 49B | 1962 |
| Cook | W. T. | Braemar, walgoolan | 9DQ and 31B, 67E | 1962 |
| Cook | Wesley Jas. | Noondel, Dandarragan | 9JC | 1924 |
| Cook | William T. | Jilbadji, Loc. 31, Burracoppin | 9DQ | 1925 |
| Cook & Broardbent | - | Etheldale, Nennin Well, Dowerin | U5U | 1924 |
| Cook & Co | E. J. S. | Elray Park Kwolyin | CK3 and 6C,40E | 1962 |
| Cook & Sons | C. & M. | Nobamyrbil, Wundowie | 4NM and 20C, 38A | 1962 |
| Cook Bros. | - | 1041, 5870, 10156, 12072, 10150,10160, 10158 Coondie, via Tooday | S9C and 108E,103B | 1962 |
| Cook Bros. | - | Noondoonia Station, Norseman | C6J and 20B, 6A | 1962 |
| Cook's Pastoral Co | - | Avon 5363, 10156, 10160, 12092, 5870, 4041, 10150, Coondle, via Toodyay | CP5 and 25D, 7E | 1962 |
| Cooke | A. | Plant 6242 Que Sera, Albany | V8V and 52F, 37B | 1962 |
| Cooke | C. H. | Wallambin Park, Koorda | H3C and 45C, 42A | 1962 |
| Cooke | F. | Plant. Loc. 6241, S. Stirling | FC8 and 112D, 42E | 1962 |
| Cooke | H. M. | Watteles Farm, Waroona | K5O | 1924 |
| Cooke | M. T. | Hope Vale, Dumbleyung | M9T | 1912 |
| Cooke | M. T. | Hope Valley, Dumbleyung | M9T | 1924 |
| Cooke | Mercy | Durham Dairy, Cannington | CM7 | 1912 |
| Cooke | Mercy | Durham Dairy, Cannington | CM7 | 1924 |
| Cooke | Mrs R. | Quellington, via York | C6R | 1924 |
| Cooke | Mrs. Retta | Quellington, via York | C6R | 1912 |
| Cooke | R. J. | Lake View, Moora | 9ZC | 1924 |
| Cooke | T. E. | Namello 10184, 7100, 7860, 9411, 17011, 7095, 17536 Minnivale | 0TE and 118B, 38A | 1962 |
| Cooke | W. J. | Block 66 & 97 Wellard | V6X | 1962 |
| Cooke | W. L. | Nullagine | NL6 | 1924 |
| Cooke & Sons | M. | Stony Ridge, Grass Valley | AC4 and 13D, 107E | 1962 |
| Cooke Bros. | - | Yoolella, Doodenanning | Y3B | 1924 |
| Cooksey | H. | A 955 Rocky Gully, via Mt Barker | C0K and 15B, 17A | 1962 |
| Cookson | John | Burnt Bridge, Osborne Park | 1YZ | 1912 |
| Cookson | John | Burnt Bridge, Osborne Park | 1YZ | 1924 |
| Cookson Bros. | - | Millstream Station, Roebourne | PL1 | 1912 |
| Cookson Bros. | - | Millstream Station, Roebourne | PL1 | 1924 |
| Coolart Pastoral Co. | - | Coolart, Walebing | C7Y and 115D, 30E | 1962 |
| Coolawanyah Pastoral Co. Pty. Ltd. | - | Tambrey & Hooley, Coolanwanyah | M7C and 116D, 15E | 1962 |
| Coolawanyah Pastoral Co. Pty. Ltd. | - | Coolawanyah, Coolawanyah | Y0E and 18B, 18A | 1962 |
| Coolawanyah Pastorl Co. | - | Coolawanyah Station, via Roebourne | Y0E | 1924 |
| Cooley | Thomas C. | Robbs Homestead, Cardiff-Collie | U2C | 1924 |
| Cooligee Farm | - | Cooligee, S. Daudaragan | CE1 and 114E, 50D | 1962 |
| Cooling | E. K. | Moona Mooree, Harvey | J0G and 104A, 21B | 1962 |
| Cooling | J. M. | Well. 641, 672, 3355, Harvey | CJ8 and 108B, 24E | 1962 |
| Coombe | E. A. & P. J. | Rocky Kay, Horton Siding | E2C and 51F, 4D | 1962 |
| Coombe | H. T. | Bay View, Hortons Siding | H4C and 41D, 35E | 1962 |
| Coombe | Thos. | Gabyon, Wurarga | 1 JH | 1912 |
| Coombe | Thos. | Karrakin, E. York | CE3 | 1912 |
| Coombe | Thos. | Gabyon, Wurarga | 1JH | 1924 |
| Coombe & Sons | - | Astington, Tammin | CS1 | 1912 |
| Coombe & Sons | - | Astington, Tammin | CS1 | 1924 |
| Coombes | Andy | Commonage, Sandstone | 2CA | 1912 |
