| Simpson | Andrew | Margaret | A6Q | 1924 |
| Simpson | Arther Geo. | Paynesville | AO0 | 1924 |
| Simpson | C. D. & E. H. | Tatiara, Wickepin | SP2 and 16D, 16E | 1962 |
| Simpson | Charles R. | Green Park, Xantippe | G1S | 1927 |
| Simpson | E. V. | Blue Hills, Kendenup | OO7 and 47B, 24E | 1962 |
| Simpson | E. V. | Blue Hills, Kendenup | OO7 and 47D, 24E | 1962 |
| Simpson | Ernest Ed. | Orange Grove, Dangin | X1S | 1924 |
| Simpson | F. G. (jnr) | 1593/37 Avon Loc. 9830, Quairading | S1Q and 35B, 120A | 1962 |
| Simpson | Francis Cully | Rockfield, Quairading | S1M | 1926 |
| Simpson | G. | Murugie, Ejanding, via Dowerin | G5S and 42C, 27A | 1962 |
| Simpson | G. C. | Rinadena, Broomehill | GS6 and 46B, 114A | 1962 |
| Simpson | G. D. | Sunnymia, Jindalup | S9V and 7B, 118A | 1962 |
| simpson | G. F. | 5840 Borden Road, Napier, Albany | GS8 and 39C, 20A | 1962 |
| Simpson | G. W. | Avon Loc. Lot 4, Spencer Brook | X9R and 120D, 12E | 1962 |
| Simpson | G. W. | Avon Loc.Lot 4, Spencer Brook | X9R and 120D, 12E | 1962 |
| Simpson | H. | Elba Farm, Waterloo | SN0 | 1962 |
| Simpson | H. F. | Mindora, Tambellup | 5HS and 45B, 109A | 1962 |
| Simpson | H. R. | Manningham, Ulonging Hill, Quairading | S6M | 1912 |
| Simpson | H. R. | Manningham, Ulonging Hills, Quairading | S6M | 1924 |
| Simpson | J. | Moorpark Farm, Eastbrook, via Pemberton | 9XZ | 1924 |
| Simpson | J. | Bartondale, Metricup | J9S and 21C, 37A | 1962 |
| Simpson | J. D. | Sunsetglen, Kirwan | 7SJ and 12B, 17A | 1962 |
| Simpson | J. E. | Netherby, North Boyanup | E8Z | 1924 |
| Simpson | J. E. | Loc. 372, 373, 370, 10339, East Cannington | E8Z and 84B, 58F | 1962 |
| Simpson | J. F. | 10339, Eneabba, via Three Springs | 7SJ and 38B, 112E | 1962 |
| Simpson | J. W.E. | Bartondale, Metricup | J9S and 21C, 37A | 1962 |
| Simpson | Jas., jun. | Block 11404, Hines Hill | SO4 | 1924 |
| Simpson | John | Orange Grove, Dangan | X1S | 1912 |
| Simpson | Paul | Private Paddock, Irwin | 6OS | 1924 |
| Simpson | Peter M. | Avon Location 23362, Graball | X8Z | 1924 |
| Simpson | R. C. | Locs. 14887, 26058, 20930, Quairading | S1M and 37C, 18A | 1962 |
| Simpson | R. E. | Kirwan 2542, Burakin | R S3 and 48B, 42A | 1962 |
| Simpson | R. E. | Kirwan 2542, Burakin | RS3 and 48B, 42A | 1962 |
| Simpson | S. T. & B. V. | 23897-8, 23911, 19622, 17609, 18535, Bullring | 3TS and 12C, 37E | 1962 |
| Simpson | S. T. & B. V. | 23897-8, 23911, 19622, 17609, 18535, Bullaring | 3TS, 12C, 37E | 1962 |
| Simpson | Saffrey | Nillumbik, Popanyinning | S2S | 1928 |
| Simpson | T. | Water Gully Farm, Nabawa | 7GZ | 1924 |
| Simpson | T. W. | Prospect Dairy, N. Perth | 2XS | 1924 |
| Simpson | Thos. E. | Lots 1184, 1186, Riverton Estate, Victoria Park | SZ9 | 1924 |
| Simpson | V. M. & G. R. | 8952 Northampton | 7GZ and 12C, 6E | 1962 |
| Simpson | Wm. | Donnelly Park, Manjimup | Z3T | 1924 |
| Simpson & Co | E. J. | Tarella, Tambellup | 3NV and 84D, 19E | 1962 |
| Simpson & Co. | A. G. | Mt. Magnet, Mt. Magnet | SE2 | 1912 |
| Simpson & Hollingsworth | - | Warwick Park, Latham's Rock | S0Q | 1924 |
| Simpson & Randall | - | Bridge House, Donnelly River | S4R | 1912 |
| Simpson & Randall | - | Bridge House, Donnelly River | S4R | 1924 |
| Simpson & Whitely | - | Quondong Farm, Bowgada | XZ1 | 1924 |
| Sims | A. E. | Williams 7363, 8686, 10287, 12267, Toolibin, via Narrogin | 3PS and 31B, 11E | 1962 |
| Sims | A. G. | Riverdale, Popanyinning | ZG3 | 1924 |
| Sims | A. G. | Avon 3757, Coates, via Bakers Hill | 8UD and 16D, 25E | 1962 |
