| 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 |
| Parnell & Sons | G. W. | Myrtle Farm, Tambellup | P3L and 46C, 42E | 1962 |
| Parnham | A. J. | Redcliffe, Jennacubbine | AP5 and 25D, 115E | 1962 |
| Parnham | Catherine | Bolonine, Northam | GP3 | 1924 |
| Parnham | E. M. & E. J. | Locs. 11727, 15162, 1880, 15042, Mumberkine, via Northam | P1O and 28D, 27E | 1962 |
| Parnham | E. T. M. | Port. Swan Loc. 91, 1352, Bullsbrook | TP6 and 103B, 116E | 1962 |
| Parnham | Edward | Daunton, Mumberkine via Northam | P1⊚ | 1927 |
| Parnham | Estate of T. M. | Bolomine, Jennacubbine | 2TP and 44D, 10E | 1962 |
| Parnham | George | Bolonine, Northam | GP3 | 1912 |
| Parnham | W.G. | Jennacubbine Farm, Jennacubbine | W2Z and 114B, 114A | 1962 |
| Parnham | Wm. Geo. | Daunton Farm, Momberkine, Northam | W2Z | 1924 |
| Parolo | A. | Avongrove, Yearlie | P0U and 46C, 31E | 1962 |
| Parolo | Luigi | Lake Grace | PY8 | 1925 |
| Parravicini &Sons | G. C. | Nelson Loc. 9758, Port. 29637, Manjimup | YZ7 and 117B, 111A | 1962 |
| Parrock & Co. | - | Bedan Farm, Carnamah | W8P | 1912 |
| Parrock & Co. | - | Bedan Farm, Carnamah | W8P | 1924 |
| Parrott | Herbert Chas. | Phoenix Road, Spearwood | 5PO | 1924 |
| Parry | E. B. | Commonage, Roebourne | BP7 | 1912 |
| Parry | E. B. | Commomage, Roebourne | BP7 | 1924 |
| Parry | Edward E. | Canning Wood, Wubin | P6Y | 1924 |
| Parry | H. E. | Perringa Stud, Serpentine | 8IP and 109B, 50A | 1962 |
| Parry | J. & E. V. | Winston, East Dalwallinu | E9P and 41B, 103E | 1962 |
| Parry | L. J. | Lynwood Farm 1157, Denbarker | 3LP and 119D, 38E | 1962 |
| Parry | M. S. | Melson Farm, Coorow | M2P and 41A, 31B | 1962 |
| Parry & Woodland | - | Dee Aye, Geraldton | P5W and 108B, 49A | 1962 |
| Parsley | Henry | Ashburton, Onslow | H8P | 1912 |
| Parsley | Henry | Ashburton, Onslow | H8P | 1924 |
| Parsloe | F. W .S. | Cambrawarra, Borden | 8FP and 11D, 7E | 1962 |
| Parsloe | Fredk. W. S. | Salt River, Salt River Mail, via Gnowangerup | 8FP | 1924 |
| Parsonage | L. V. & T. P. | Thorn Hill, Yallingup, via Busselton | V6P | 1924 |
| Parsons | A. & J. | Wywurrie and Sunny View, Korrelocking | AP0 and 50C, 12E | 1962 |
| Parsons | A. C. | Forrest Glen, Corrigin | A9P and 25B, 107A | 1962 |
| Parsons | A. V. G. | Lakeside, Tenterden | 4VP and 42D, 11E | 1962 |
| Parsons | Albert Geo. | Nunigup, Mt. Barker | 4VP | 1924 |
| Parsons | B. R. & M. F. | Linden Park, Corrigin | 2BF and 14D, 35E | 1962 |
| Parsons | C. | Yelki, Corrigin | 7CP and 24B, 110E | 1962 |
| Parsons | C. E. | C. P. 15414 /55 & 19112 /55, Brookhampton | 9CP | 1912 |
| Parsons | C. E. | C.P. 15414/55 and 19112/55, Brookhampton | 9CP | 1924 |
| Parsons | C. F. E. | Tranquil Vale, Plantagenet Loc. 1880, C/ T8499/61, Denmark | 0PY | 1962 |
| Parsons | Catherine | Gillingarra, Gillingara | 1KP | 1912 |
