| Wynne | H. E. | Blocks 24082/55, 13149/74, Baandee | 1WE | 1924 |
| Wynne | Henry Jos. | Hastoe Farm, North Kellerberrin | YN2 | 1924 |
| Wynne | J. M. | Millingup, Capel | 8JJ and 50C, 80A | 1962 |
| Wynne | Jas. | Millingup, Capel | 8JJ | 1912 |
| Wynne | Jas. | Millingup, Capel | 8JJ | 1924 |
| Wynne | John | 32 Kimberley Street, Leederville | 1OY | 1924 |
| Wynne | W. M. | Milverton, Pingelly | 4MW | 1912 |
| Wynne | W. M. | Milverton, Pingelly | 4MW | 1924 |
| Wynne & Jones | - | Nestle Brae, Totadgin, Merredin P.O. | UW0 | 1924 |
| Wynyangoo Pastoral Co. Ltd. | - | Wynyangoo Station, Mt. Magnet | OE7 and 20C, 5A | 1962 |
| Yabboo Pastoral Co. | - | Yabboo, Bindoon | Y1P and 26B, 32A | 1962 |
| Yagmich | R. | Swan Loc. 188 and 202, Middle Swan | RY5 and 49D, 118E | 1962 |
| Yakamia Dairy Pty. Ltd. | - | Albany Lots 746-7, Albany | YH0 and 109B, 42A | 1962 |
| Yallaling Pastoral Co. | - | Yallaling and Kirwan, Wongan Hills | ZJ6 and 23B, 12E | 1962 |
| Yalleen Pastoral Co. | - | Mt. Enid, Onslow | 0XU | 1962 |
| Yaminga Estates | - | Kent 2875-2882. 2918, 3017-8, 3707, Borden | YE6 and 109D, 117E | 1962 |
| Yandanooka Estate | - | Yandanooka Estate, c/o Department of Agriculture | Y1E | 1924 |
| Yandell Ernest & Otto | - | Brooking, Fitzroy River | EY5 | 1912 |
| Yandell, Ernest & Otto | - | Brooking, Fitzroy River | EY5 | 1924 |
| Yandi Pastoral Co. | - | Yandi, Geraldton | E0H and 14B, 46E | 1962 |
| Yandil Pastoral Co. Pty. Ltd. | - | Yandil, Wiluna | YL0 and 14C, 45E | 1962 |
| Yandle | Francis | Koolberrin, Via Bruce Rock | 2FY | 1924 |
| Yangedine Pastoral Co. | - | Avon H2, Beverley | YZ0 and 3C, 47A | 1962 |
| Yanget Pastoral Co. | - | Yanget Station, Geraldton | 1YT and 22D, 10E | 1962 |
| Yanrey Pastoral Co. Pty. Ltd. | - | Yanrey Station, Onslow | DE1 and 1C, 24E | 1962 |
| Yardee Creek Pastoral Co. | - | Yardee Creek Station via Carnarvon | OH9 | 1928 |
| Yardley | G. | Locs. 9811, 5889, Manjimup | TY1 | 1962 |
| Yaringa Pastoral Co. Ltd. | - | Yaringa South Station, Carnarvon | 5HS and 16B, 17E | 1962 |
| Yarlarweelor Pastoral Co. | - | Condalong, Kojonup | OF1 and 22C, 40A | 1962 |
| Yarlaweelor Pastoral Co. | - | Yarlarweelor Station, Meekatharra | OF1 and 4B, 34A | 1962 |
| Yarrabee Grazing Co. | - | Yarrabee, Bokal | YJ1 and 21B, 36A | 1962 |
| Yarragadee-Nalbarra Pastoral Co. Pty. | - | Nalbarra Station and Yarragadee, Mt. Magnet and Mingenew | Y1N and 84B, 5A | 1962 |
| Yarranup Grazing Co. | - | Yarranup, Kojonup | 6JJ and 53F, 28B | 1962 |
| Yarraquin Pastoral Co. | - | Yarraquin Station, Cue | 2JB and 14C, 37A | 1962 |
| Yates | A. R. | Kenway 188, Boyup Brook | LO1 and 16C, 8A | 1962 |
| Yates | Arhtur R. | Dorrington Farm, Kojonup | HY3 | 1926 |
| Yates | B. M. & B. D. | Victoria Locs. 7839, 7805, 8566, 8509, Buntine | BY0 and 80B, 118A | 1962 |
| Yates | C. | Nelson Loc. 2987 Kenway, Boyup Brook | 2CY and 4B, 36E | 1962 |
| Yates | Chas. Hy. | Dorrington, Kojonup | HY3 | 1912 |
| Yates | Chas. Hy. | Dorrington, Kojonup | HY3 | 1924 |
| Yates | Chas. T. | Glenarrie, Bridgetown | XY2 | 1924 |
| Yates | E. J. & S. M. | Kokkapinm, Kwolyin | E8Y | 1924 |
| Yates | F. | Riverside, Northam | FY1 | 1912 |
| Yates | F. | East Perth Hotel, East Perth | 2YF | 1924 |
| Yates | F. | Riverside, Northam | FY1 | 1924 |
| Yates | F. C. & J. S. | Avon Loc. 7187, Cunderdin | YC6 and 37B, 112A | 1962 |
| Yates | Geo. | The Elms, Mt. Barker | GY3 | 1924 |
| Yates | H. D. | Aneona, Muradup | DY2 | 1924 |
| Yates | H. L. McK. | Wellington Locs. 1003 and 1004, Capel | LY7 | 1962 |
| Yates | J. T. & W. | Ainsworth Vale, Yelbeni | JY6 | 1924 |
