| Sinclair | J. | Farmer | Victoria District (Greenough) | 1876 | WA Almanack |
| Sinclair | J. | Shipwright | Fremantle | 1877 | Herald Almanack |
| Sinclair | J. | Telegraph Messenger | Guildford | 1877 | Herald Almanack |
| Sinclair | J. | Telegraph Messengr | Guildford & Swan | 1877 | WA Almanack |
| Sinclair | J. | Telegraph Messenger | Guildford | 1878 | Herald Almanack |
| Sinclair | J. | StoreKeeper | Geraldton | 1879 | Herald Almanack |
| Sinclair | J. | Telegraph Messenger | Guildford | 1879 | WA Almanack |
| Sinclair | J. | Storekeeper | Geraldton | 1880 | Herald Almanack |
| Sinclair | J. | Store Keeper | Victoria District (Geraldton) | 1880 | WA Almanack |
| Sinclair | J. | Storekeeper | Geraldton | 1881 | Herald Almanack |
| Sinclair | J. | Water Police Constable | Wellington District (Bunbury, Etc.) | 1881 | WA Almanack |
| Sinclair | J. | Storekeeper | Geraldton | 1882 | Herald Almanack |
| Sinclair | J. | Sergeant Police & Wheelwright | Williams River | 1882 | Herald Almanack |
| Sinclair | J. | Farmer | Newcastle & Toodyay District | 1882 | WA Almanack |
| Sinclair | J. | Water Police Constable | Wellington District (Bunbury, Etc.) | 1882 | WA Almanack |
| Sinclair | J. | Storekeeper | Geraldton | 1883 | Herald Almanack |
| Sinclair | J. | R. & Wheelwright | Williams River | 1883 | Herald Almanack |
| Sinclair | J. | Storekeeper | Victoria District | 1884 | Herald Almanack |
| Sinclair | J. | Medical Officer & Wheelwright | Williams River | 1884 | Herald Almanack |
| Sinclair | J. | Wtr Police Constable | Wellington District (Bunbury, Etc.) | 1884 | WA Almanack |
| Sinclair | J. | Medical Officer & Wheelwright | Williams River | 1885 | Herald Almanack |
| Sinclair | J. | Water Police Constable | Wellington District | 1886 | WA Almanack |
| Sinclair | J. | Farmer | Newcastle | 1887 | WA Almanack |
| Sinclair | J. | Water Police Constable | Bunbury | 1887 | WA Almanack |
| Sinclair | J. | Stationmaster | Eucla (Esperance) | 1887 | WA Almanack |
| Sinclair | J. | Farmer | Newcastle | 1888 | WA Almanack |
| Sinclair | J. | Water Police Constable | Bunbury | 1888 | WA Almanack |
| Sinclair | J. | Stationmaster (Esperance) | Eucla, Etc. | 1888 | WA Almanack |
| Sinclair | J. | Farmer | Newcastle | 1889 | WA Almanack |
| Sinclair | J. | Houseowner | Bunbury, Etc. | 1889 | WA Almanack |
| Sinclair | J. | Stationmaster | Eucla, Etc (Esperance) | 1889 | WA Almanack |
| Sinclair | J. | | Bunbury | 1897 | Witton's Directory |
| Sinclair | J. (Jun.) | Farmer | Toodyay | 1877 | Herald Almanack |
| Sinclair | J. (Sen.) | Farmer | Toodyay | 1877 | Herald Almanack |
| Sinclair | J. Jun | Farmer | Toodyay | 1876 | WA Almanack |
| Sinclair | J. Jun. | Farmer | Toodyay | 1876 | Herald Almanack |
| Sinclair | J. R. | Postmaster | Esperance Bay | 1897 | Witton's Directory |
| Sinclair | J. Sen | Farmer | Toodyay | 1873 | Herald Almanack |
| Sinclair | J. Sen | Farmer | Toodyay | 1875 | WA Almanack |
| Sinclair | J. Sen | Farmer | Toodyay | 1876 | WA Almanack |
| Sinclair | J. Sen. | Farmer | Toodyay | 1874 | Herald Almanack |
| Sinclair | J. sen. | Farmer | Toodyay | 1874 | WA Almanack |
| Sinclair | J. Sen. | Farmer | Toodyay | 1875 | Herald Almanack |
| Sinclair | J. Sen. | Farmer | Toodyay | 1876 | Herald Almanack |
| Sinclair | J. sen. | Farmer | Toodyay | 1877 | WA Almanack |
| Sinclair | J. Sen. | Farmer | Farmer (Dumbarton) | 1879 | Herald Almanack |
| Sinclair | J. sen. | Farmer and Grazier | Toodyay | 1879 | WA Almanack |
| Sinclair | J. Sen. | Farmer | Toodyay (Dumbarton) | 1884 | Herald Almanack |
| Sinclair | J. sen. | Farmer | Toodyay (Dumbarton) | 1886 | WA Almanack |
| Sinclair | J. Senr. | Farmer | Toodyay (Dumbarton) | 1880 | Herald Almanack |
