| Poller | John | Trenton Dale, Roelands | 1JQ | 1924 |
| Poller & Sons | V. J. | Locs. 1, 34-5, 40, Roelands | 1JQ and 54F, 31B | 1962 |
| Pollett | Chas. A. | Englefield, Tambellup | CP6 | 1912 |
| Pollett | Chas. A. | Englefield, Tambellup | CP6 | 1924 |
| Pollett | Mary Jane | Nina Farm, Northampton | OA1 | 1912 |
| Pollett | Mary Jane | Nina Farm, Northampton | OA1 | 1924 |
| Pollitt | Charles W. | Woodside Farm, Manjimup | GP2 | 1927 |
| Pollitt | Jas. | The Springs, Toodyay | POO | 1924 |
| Pollock | A. G. | Locs. 9807, 11206, 11824, Nannup | W0X | 1962 |
| Pollock | R. | Ords Farm, Belka | P2U | 1924 |
| Pomery | H. H. | 4230, 4250, Somerset Hill, Denmark | Y1J | 1962 |
| Pond | L. R. & R. J. | Corahnga, Emohrud and Asphodel, Bendering and Kalamunda | R7P and 23D, 16E | 1962 |
| Pond | S. G. & E. D. | Ivanhoe, Seymour, Hazeldene, Bendering | P6S and 31D, 52F | 1962 |
| Pond | W. G. | Myrtle Park, Brookton | 4WP | 1912 |
| Pond | W. G. | Myrtle Park, Brookton | 4WP | 1924 |
| Pont | H. W. | Eridge, Bardoc | HP4 | 1912 |
| Pont | H. W. | Eridge, Bardoc | HP4 | 1924 |
| Pontifex | C. W. | Wyroona, Doodlakine | UT2 and 11B, 30A | 1962 |
| Pontifex | J. & J. | Avon Loc. 27174 | 3JP and 17C, 108A | 1962 |
| Pontifex | L. & D. | Kybunga, Doodlakine | A7X and 47D, 31E | 1962 |
| Ponton | W. sen. | Gab Tupic, Cape Arid | 1PC | 1912 |
| Ponton | W. sen. | Gab Tupie, Cape Arid | 1PC | 1924 |
| Ponton Bros. & Sharp | - | Balladonia, Albany | P1S | 1912 |
| Ponton Bros. & Sharp | - | Balladonia, via Norseman | P7Z | 1924 |
| Ponton Bros. & Sharp | - | Balladonia, Via Norseman | P7Z and 13B, 4A | 1962 |
| Pook | R. L. | 650, 957, 954, Coolup | P0K | 1962 |
| Pool | F. & S. | Caroona, Jitarning | F4P and 6B, 104E | 1962 |
| Pool | Katharine H. | Maryville, Latham | 4KP | 1924 |
| Pool Bros. | - | Lake View, Wagin | P2B | 1912 |
| Pool Bros. | - | Lake View, Wagin | P2B | 1924 |
| Poole | Charles C. | Jundimong, Burracoppin | QP9 | 1925 |
| Poole | D. S. | Coppin Rock, Warralakin, Via Westonia | DJ7 and 33B, 7A | 1962 |
| Poole | E. W. | Glen Echo, Lower Kalgan, Albany | 5BK and 47D, 35E | 1962 |
| Poole | Ed. | H. F., Greenough | EL9 | 1912 |
| Poole | Ed. | H. F. Greenough | EL0 | 1924 |
| Poole | Geo. | Jubilee Downs, Fitzroy | UZ9 | 1912 |
| Poole | Geo. | Jubilee Downs, Fitzroy | UX9 | 1924 |
| Poole | H. M. | Sunnyside, Warralakin | IP9 and 50B, 67E | 1962 |
| Poole | Hy. Jas. | Greenough | PZ1 | 1912 |
| Poole | Hy. Jas. | Greenough | PZ1 | 1924 |
| Poole | J. | Water Hole Farm, South Greenough | 8JP | 1912 |
| Poole | J. jun. | Water Hole Farm, South Greenough | 8JP | 1924 |
| Poole | John A. | Sturt, Narrogin | JP9 | 1912 |
| Poole | John A. | Sturt, Narrogin | JP9 | 1924 |
| Poole | Jos. | cr. Frobisher Road and Roberts Street, Osborne Park | OZ8 | 1924 |
| Poole | Richard M. | Yilgarn Loc. 243, Burracoppin | 8QP | 1925 |
| Poole | Sophia | Hamilton Hill. South Fremantle | OP5 | 1924 |
| Poole Bros. | - | Hector Street, Osborne Park | PB4 | 1926 |
| Pooley | W. R. V. | Hay Loc. 2110, Mt. Barker | W9P and 52F, 9D | 1962 |
| Poolman | J. J. K. | Wiltshire Farm, Denmark | XP3 | 1962 |
