| Parker & Sons | A. E. | Lake Hinds and Swan Loc. 1371, Bindoon | PU4 and 84B, 29A | 1962 |
| Parker & Sons | L. (Mrs) | Tanglewood, Gnowangerup | 7PL and 34C, 9A | 1962 |
| Parker & Williams | - | Dairy, Boulder | PW1 | 1912 |
| Parker & Williams | - | Dairy, Boulder | PW1 | 1924 |
| Parker Bros. | - | Meelyah Lake, Marchagee | PB3 | 1912 |
| Parker Bros. | - | Glen Allen, Tingarrup Siding | PB4 | 1912 |
| Parker Bros. | - | Meelyah Lake, Marchagee | PB3 | 1924 |
| Parker Bros. | - | Glen Allen, Tingarrup Siding | PB4 | 1924 |
| Parker Bros. | - | Waroona | PV5 | 1924 |
| Parker Bros. | - | Drakesbrook 508, 542, 1218 Murray, Waroona | PV5 | 1962 |
| Parkerville Childeren's Home (Inc.) | - | Parkerville Childeren's Home, Parkerville | PC6 and 12C, 109A | 1962 |
| Parkes | H. M. | Commonage, onslow | 6KP | 1912 |
| Parkes | H. M. | Commonage, Onslow | 6KP | 1924 |
| Parkes | Harry F. | Piccadilling Farm, Marley Pool, via York | O5P | 1924 |
| Parkes | John | Plain View Farm, Nungarin | V2P | 1924 |
| Parkes | John Rowe | Loc. 3, Block 66, Bunbury | KP4 | 1924 |
| Parkes | Robt. | Gimlet Wall, Quairading | R4P | 1924 |
| Parkey | F. | 213, Waroona | TT2 and 5B, 118A | 1962 |
| Parkhill | H. A. | 333, Pinjarra | C2X and 36B, 27A | 1962 |
| Parkhill | Louisa | Springfield, North Dandalup | PK5 | 1912 |
| Parkhill | Louisa | Springfield, North Dandalup | PK5 | 1924 |
| Parkin | Chas. E. | Armadale | CP0 | 1912 |
| Parkin | Chas. E. | Armadale | CP0 | 1924 |
| Parkin | E. | Houghs Brook, Ferguson | PE6 | 1962 |
| Parkin | F. | Hill Top Farm, Ferguson | P4O and 45D, 4E | 1962 |
| Parkin | Henry | Mr. MacPherson's, Carnamah | 0PN | 1924 |
| Parkin | John | Hill Top, 9 Mile, Ferguson | P4O | 1924 |
| Parkin | Lawrence | Hillsbro, Matthew Street, West Guildford | 0LP | 1924 |
| Parkin | O. E. & G. | Wincobank, Wanneroo | 5EQ and 116D, 45E | 1962 |
| Parkinson | E. & P. | Lot 48, Bindoon | EP2 and 30D, 36E | 1962 |
| Parkinson | G. H. | Clovermoor Loc. 2239, Cowaramup | C3D and 31B, 102E | 1962 |
| Parkinson | H. W. | Lakerue, Magetup, Salt River | P4P | 1924 |
| Parkinson | J. E. | A.17, Yanmah, via Manjimup | P4E | 1962 |
| Parkinson | James | Hollowforth Farm, Kondut, via Ballidu | 7NP | 1924 |
| Parkinson | Rebecca | White Gum Valley, South Fremantle | P7E | 1924 |
| Parkinson | T. L. | Kumarina, Meekatharra | TP7 and 80B, 14A | 1962 |
| Parkiss | A. | Mulikup Siding & at Katanning | OP1 | 1912 |
| Parklands Grazing Co. | - | Parklands, Wanneroo | 1YM and 7B, 38A | 1962 |
| Parkyn | W. A. | Eden Dale, Northampton | A3P | 1912 |
| Parkyn | W. A. | Eden Dale, Northhampton | A3P | 1924 |
| Parmenter | S. T. | Maiden Park, Mullalyup | SP9 | 1912 |
| Parmenter | S. T. | Maiden Park, Mullalyup | SP9 | 1924 |
| Parnell | A. D. | W.S.L.S. Loc. 8791, Katanning | P4K and 17D, 119E | 1962 |
| Parnell | E. V. | Toolbrunup | PO7 | 1924 |
| Parnell | F. G. | Bella Vista, Tinkurrin | 6ZP | 1924 |
| Parnell | Fred Geo. | Locs. 6720, 3327-8, and 4380, Warren Road, via Katanning | P9F | 1924 |
| Parnell | R. K. & M. E. | Plantagenet Loc. 4218, Denmark | CT0 and 102B, 43E | 1962 |
| Parnell | Richard S. | (Farmer), Pallingup Estate, Gnowangerup | YN6 | 1924 |
| Parnell | W. R. | Dingering, Tinkurrin | W5S and 38C, 30A | 1962 |
| Parnell & Son | R. S. | Floradale, Gnowangerup | YN6 and 19C, 23E | 1962 |
