| Simpson | T. | | John Street, North Fremantle | 1897 | Witton's Directory |
| Simpson | W. | Warder | Fremamtle (Rottnest) | 1876 | Herald Almanack |
| Simpson | W. | - | Bunbury | 1877 | WA Almanack |
| Simpson | W. | Farmer | Toodyay | 1877 | WA Almanack |
| Simpson | W. | Tanner | Albany | 1881 | WA Almanack |
| Simpson | W. | Tanner | Albany | 1882 | WA Almanack |
| Simpson | W. | Tanner (Randford Bros. & Simpson) | Perth | 1886 | WA Almanack |
| Simpson | W. | Tanner(Ranford Bros. & Simpson) | Perth | 1887 | WA Almanack |
| Simpson | W. | Tanner (Ranford Bros. & S.) | Perth | 1888 | WA Almanack |
| Simpson | W. | Tanner (Ranford, Bros. & Simpson) | Perth | 1889 | WA Almanack |
| Simpson | W. D. | - | North-West Coast (Roebourne) | 1884 | WA Almanack |
| Simpson | Walter | Harness Maker | Toodyay | 1878 | Herald Almanack |
| Simpson | Walter | Harness Maker | Toodyay | 1879 | Herald Almanack |
| Simpson | Walter | Harness Maker | Toodyay | 1880 | Herald Almanack |
| Simpson | Walter | Harness Maker | Toodyay | 1881 | Herald Almanack |
| Simpson | Walter | Harness Maker | Toodyay | 1882 | Herald Almanack |
| Simpson | William | Landing Waiter | Bunbury | 1885 | Herald Almanack |
| Simpson | Wm. | | Barker Road, Perth | 1897 | Witton's Directory |
| Simpson & Cameron | - | Graziers | North-West Coast (Ashburton River) | 1886 | WA Almanack |
| Simpson & Co. | | Fremantle Wholesale & Retail Fruit Mart | High Street, Fremantle | 1897 | Witton's Directory |
| Simpson & MacIntosh | - | Pearler & Grazier | Fortescue River | 1879 | Herald Almanack |
| Simpson & MacIntosh | - | Pearlers & Graziers | North-West Coast (Fortescue River) | 1881 | WA Almanack |
| Simpson & McIntosh | - | - | North-West Coast - Roebourne & Cossack | 1878 | Herald Almanack |
| Simpson & McIntosh | - | - | North-West Coast (Roeburne & Cossack) | 1879 | WA Almanack |
| Simpson & McIntosh | - | Pearlers & Graziers | Fortescue River | 1880 | Herald Almanack |
| Simpson & McIntosh | - | Pearlers & Graziers | Fortescue River | 1882 | Herald Almanack |
| Simpson & McKay | - | Graziers | North-West Coast (Ashburton River) | 1886 | WA Almanack |
| Simpson & Morton | - | Pearlers & Graziers | Fortescue River | 1883 | Herald Almanack |
| Simpson & Morton | - | Pearlers & Graziers | Fortescue River | 1884 | Herald Almanack |
| Simpson & Simpson | Tanner | Ranford Bros. | Perth | 1884 | Herald Almanack |
| Simpson (Ranford Bros. & Simpson) | W. | Tanner | Perth | 1885 | Herald Almanack |
| Sims | C. | Farmer | Victoria Districts (Irwin) | 1866 | WA Almanack |
| Sims | C. | Farmer | Victoria District (Greenough) | 1867 | WA Almanack |
| Sims | C. | Farmer | Victoria District (Greenough) | 1868 | WA Almanack |
| Sims | C. | Farmer | Victoria District (Greenough) | 1869 | WA Almanack |
| Sims | C. | Farmer | Victoria District (Greenough) | 1870 | WA Almanack |
| Sims | C. | Farmer | Victoria District (Greenough) | 1872 | WA Almanack |
| Sims | C. | Farmer | Greenough Flats | 1873 | Herald Almanack |
| Sims | C. | Farmer | Victoria District (Greenough) | 1873 | WA Almanack |
| Sims | C. | Farmer | Greenough Flats | 1874 | Herald Almanack |
| Sims | C. | Farmer | Victoria District (Greenough) | 1874 | WA Almanack |
| Sims | C. | Farmer | Greenough | 1875 | Herald Almanack |
| Sims | C. | Farmer | Greenough | 1875 | WA Almanack |
| Sims | C. | Farmer | Greenough | 1876 | Herald Almanack |
| Sims | C. | Farmer | Victoria District (Greenough) | 1876 | WA Almanack |
| Sims | C. | Farmer | Greenough | 1877 | Herald Almanack |
| Sims | C. | Farmer | Victoria District (Greenough) | 1877 | WA Almanack |
| Sims | C. | Farmer | Greenough | 1878 | Herald Almanack |
| Sims | C. | Farmer | Greenough | 1879 | Herald Almanack |
| Sims | C. | Farmer | Greenough | 1879 | WA Almanack |
