| Pethybridge | R. | 5663-4-5, 7810, 4349, Narrogin | 4PB and 28B, 29A | 1962 |
| Pethybridge | Rae | East Highbury, Highbury | 4PB | 1924 |
| Pethybridge Bros. | - | East Highbury, Highbury | 4PB | 1912 |
| Petricevich | F. | 51 Collingwood St. Osborne Park | FP6 and 13C, 45A | 1962 |
| Petricevich | Frank | Osborne Park | FP6 | 1927 |
| Petropulos | F. | Nelson Loc. 9033, Manjimup | 7YD | 1962 |
| Pettendrigh | Chas. | Kelinnbank, Mendalup Road, via Manjimup | P6K | 1924 |
| Pettersen | H. C. | Locs. 5945 (3610), Bridgetown | IP7 | 1962 |
| Pettigrew | J. | Duggan Siding, Kukerin | JP1 and 30B, 20E | 1962 |
| Pettit | Cyril H. | Medoura, Gingin | P5T | 1924 |
| Pettit | E. M. | Rose Farm, Greenhills | E0M | 1912 |
| Pettit | E. M. | Rose Farm, Greenhills | E0M | 1924 |
| Pettit | Edward Jas. | Talbot, via York | E9P | 1924 |
| Pettit | G. N. & E. D. | Sussex 1931-2, Kudardup | PE1 | 1962 |
| Pettit | G. W. | Strawberry | PE1 | 1912 |
| Pettit | G. W. | Strawberry | PE1 | 1924 |
| Pettit | H. | Moore Valley, Cunderdin | HP1 | 1912 |
| Pettit | H. | Moore Valley, Cunderdin | HP1 | 1924 |
| Pettit | K. W. | Highercombe, Gingin | K4P and 36B, 13A | 1962 |
| Pettit | L. P. & A. J. | Telara, Mingenew | 7WP and 33D, 84E | 1962 |
| Pettit | R. P. | Strawberry | 1PP | 1912 |
| Pettit | R. P. | Strawberry | 1PP | 1924 |
| Pettit | W. H. G. | Barr 128, Doodlakine | OP1 | 1962 |
| Pettit | W. J., H. J. & E. M. | Rocky Creek, South Cunderdin | EU0 | 1924 |
| Pettit | Walter S. | Mill Farm, Strawberry | WP4 | 1912 |
| Pettit | Walter S. | Mill Farm, Strawberry | WP4 | 1924 |
| Peverett | J. | 1254, 210-1, 198-9, 208, 209, Byford | WP0 and 39B, 4A | 1962 |
| Peverett | William | Mara Manup Stud Farm, Group 82, Peel Estate | WOP | 1927 |
| Pfeiffer | G. A. | Dornducking, Wagin | GP2 | 1912 |
| Pfeiffer | G. A. | Dornducking, Wagin | GP2 | 1924 |
| Pfeiffer | Henrick H. | Bornley, Wagin | P8A | 1924 |
| Pfeiffer | J. F. | Sunnyside Farm, East Wagin | FP2 | 1912 |
| Pfeiffer | J. F. | Sunnyside Farm, East Wagin | FP2 | 1924 |
| Pfeiffer & Gedling | - | Sunnyhurst, Wagin East | 1FA | 1912 |
| Pfeiffer & Gedling | - | Sunnyhurst, Wagin East | 1FA | 1924 |
| Pfitzner | J. O. | Wagin | JP7 | 1912 |
| Pfitzner | J. O. | Wagin | JP7 | 1924 |
| Phelan | J. J. & D. J. | Premier Park, Miling | JP4 and 36B, 7A | 1962 |
| Phelan | K. M. & H. B. | Clonmel, Miling | 2KP and 48D, 33E | 1962 |
| Phelaw | W. | Levett, Doodlakine | PN4 | 1924 |
| Phelps | A. | Common, Mt. Magnet | 7OO | 1912 |
| Phelps | A. | Common, Mt. Magnet | 7OO | 1924 |
| Phelps | R. F. | Bromshash, Latham | 1RP and 6C, 118E | 1962 |
| Philbey | F. G. | Avon Loc. 14234, Nungarin | F6P and 40D, 114E | 1962 |
| Philbin | Jasa. P. | Manna Vale, Malyalling, via Wickepin | 5PP | 1924 |
| Philipps | A. J. | Manycreeks, Kojonup | J2P and 27B, 115E | 1962 |
| Philipps | A. S. | Gem Brook, East Wagin | L1Y and 21B, 30E | 1962 |
| Philipps | E. R. | Denmark Est. Lot 340, Denmark | EP0 and 7C, 105A | 1962 |
| Philipps | G. A. & M. H. | Kojonup Loc. 6654, Kojonup | G8P and 111D, 30E | 1962 |
| Philipps | N. J. | 387, Denmark | NP1 | 1962 |
