| Plant | Nellie | Commonage, Mt. Magnet | J5P | 1924 |
| Plant | P. J. | Kent 1540, Gairdner River | PP2 and 46C, 103E | 1962 |
| Plant | P. J. S. | Four Mile Station, Wyndham | PS9 and 104D, 51F | 1962 |
| Plant | R. C. | Swan Loc. 28, Belmont | 2XP | 1924 |
| Plant | R. L. & E. M. | Eumaralla, Nomans Lake, East Narrogin | A7P and 35D, 18E | 1962 |
| Plant & Eddington | - | Plantagenet H. f. 17037/74, Merredin | P7E | 1924 |
| Platell | Mary H. | Marley Siding, Monkopin, Mt. Hardy | KP2 | 1924 |
| Platt & Archer | - | Riverview Dairy, Bayswater | 4PV | 1924 |
| Plavin | Chas. | Plavin's Mill, Pinjarra, Townsite, Collie | OPV6 | 1924 |
| Player | A. D. | Commonage, Mt. Magnet | 5AP | 1912 |
| Player | A. D. | Westwood, Moodiarrup | 5AP | 1924 |
| Player | H. L. | Westwood, Moodiarrup | HP0 | 1912 |
| Player | H. L. | adj. Dyliabing Estate, Katanning | HP0 | 1924 |
| Player | R. G. & B. A. | Hermitage Farm, Woodanilling | HP0 and 114B, 67A | 1962 |
| Playforth | Jos. | Savile Farm, Botherling, via Goomalling | NP1 | 1924 |
| Playle | A. E. | Coradine, Williams | 0PG and 37B, 3A | 1962 |
| Playle | A. F. | Adj. Dyliabing Estate, Katanning | AP5 | 1912 |
| Playle | A. F. | Norwood, Northam | AP5 | 1924 |
| Playle | A. L. | Ocean View, Loc 150-1, Torbay | P9A | 1962 |
| Playle | Elliot | Norwood, Northam | 1EP | 1912 |
| Playle | Elliot | Norwood, Northam | 1EP | 1924 |
| Playle | Grace Susan | Rose Valley Farm, Williams | 0PG | 1924 |
| Playle | John | Norwood, Northam | PL2 | 1912 |
| Playle | John | Lilydale, Williams | PL2 | 1924 |
| Playle | R. W. | Coradine Farm, Williams | R1P and 19D, 3E | 1962 |
| Playle | Richard | Hally Brook, Williams | R1P | 1912 |
| Playle | Richard | Rose Valley, Williams | R1P | 1924 |
| Playle | Rosmah | Lilydale, Williams | 2RP | 1912 |
| Playle | Rosmah | Hally Brook, Williams | 2RP | 1924 |
| Playle | Saml. | Rose Valley, Williams | SP4 | 1912 |
| Playle | Saml. | Norwood, Clackline | SP4 | 1924 |
| Playne | R. M. | Gidley, King River, Via Albany | R5P | 1962 |
| Plenderleith | Robt. M. | Common, Meekatharra | 8NP | 1924 |
| Plenty | S. G. | 6499, Green Range, Via Albany | SP4 and 9B, 32E | 1962 |
| Plester | A. J. | Norwood, Clackline | AP8 | 1912 |
| Plester | A. J. | Nargho, Dongarra | AP8 | 1924 |
| Plester | R. | Nargho, Dongarra | RP0 | 1912 |
| Plester | R. | Nargo, Dongarra | RP0 | 1924 |
| Plillipson | Thomas | Holme Mead Farm, Caron | T1P | 1927 |
| Plowman | R. D. | Nerambla, Napier, Via Albany | RP9 and 27B, 40E | 1962 |
| Plozza | A. | Kia-Ora, Denmark | ZW3 and 112B, 48E | 1962 |
| Plozza | A. A. | 5725 Plantagenet Loc. Albany | PA1 and 55F, 112B | 1962 |
| Plozza | A. G. | Dale View, Brookton | 8PX | 1924 |
| Plozza | C. W. | Parry Inlet Loc. 2093, 5459, Denmark | 8BY and 22C, 37E | 1962 |
| Plozza | E. | 5109, 11799, Diamond Tree, Via Jardee | E1P and 43B, 115E | 1962 |
| Plozza | John | Nargho, Dongarra | 6PO | 1912 |
| Plozza | John | Tireno, Gingin | 6PO | 1924 |
| Plozza | Pietra | Lowdale, Cundinup, via King | 6ZQ | 1926 |
| Plumb | Charles | Tirano, Gingin | P0K | 1912 |
| Plumb | Chas. | Lot 30 of Canning Lot 31, Kelmscott | P0K | 1924 |
