| Iager | H. | - | North-West Coast (Cossack) | 1882 | WA Almanack |
| Ice Freezing Works | | | Sylvester Street, Coolgardie | 1897 | Witton's Directory |
| Iddenden | J. | Laborer | Booranup | 1897 | Witton's Directory |
| Iffla | - | Accountant | Albany | 1880 | WA Almanack |
| Iffla | Chas H. | | Esperance Bay | 1897 | Witton's Directory |
| Ikeye | T. | Miner | Nannine | 1897 | Witton's Directory |
| Ilbery | Thomas | | Smiths's Mill | 1897 | Witton's Directory |
| Iles | - | Carter | Guildford (Eyles) | 1885 | Herald Almanack |
| Iles | -- | Schoolmaster | Mary Street, Fremantle | 1897 | Witton's Directory |
| Iles | F. | | John Street, Perth | 1897 | Witton's Directory |
| Iles | H. | Schoolteacher | Guildford | 1885 | Herald Almanack |
| Iles | H. | Assistant Teacher Government School | Guildford | 1887 | WA Almanack |
| Iles | H. E. | Master, Boys' Govt. School | York | 1887 | WA Almanack |
| Iles | H. J. | Master Boys' Govt. School | York | 1888 | WA Almanack |
| Iles | H. J. | Master Boys Govt. School | York | 1889 | WA Almanack |
| Iles | H. J. | Head School Teacher | Russell Street, Beaconsfield | 1897 | Witton's Directory |
| Iles | J. | Miner | Cue | 1897 | Witton's Directory |
| Iles | J. M. | | Cue | 1897 | Witton's Directory |
| Iles | R. | Carter | Guildford (Eyles) | 1879 | Herald Almanack |
| Iles | R. | Carter | Guildford (Eyles) | 1880 | Herald Almanack |
| Iles | R. | Labourer | Guildford | 1887 | WA Almanack |
| Iles | R. | Labourer | Guildford | 1888 | WA Almanack |
| Iles | R. | Labourer | Guildford | 1889 | WA Almanack |
| Iles | R. (Eyles) | Carter | Guildford (Eyles) | 1881 | Herald Almanack |
| Iles | W. G. | | Esperance Bay | 1897 | Witton's Directory |
| Iles | Wm. | | Bunbury | 1897 | Witton's Directory |
| Iles (Eyles) | R. | Carter | Guildford | 1884 | Herald Almanack |
| Illingsworth | J. C. | | Bunbury | 1897 | Witton's Directory |
| Illingsworth | W.A. | | Bunbury | 1897 | Witton's Directory |
| Illingworth | A. E. | | "Neualletta" Ellen Street, Perth | 1897 | Witton's Directory |
| Illingworth | F. | M.L.A. | Ellen Street, Perth | 1897 | Witton's Directory |
| Illingworth | Fredk. | M.L.A, Land Agent | Saint George's Terrace, Perth | 1897 | Witton's Directory |
| Illsley | Geo. | Carpenter | Guildford | 1897 | Witton's Directory |
| Imperial Fire Insurance Co. | Smith, C. H. | Manager | Ground Floor, 53 Carnarvon Chambers, William Street, Perth | 1897 | Witton's Directory |
| Imperial Restaurant (G. Lovett, Proprietor) | | | Hannan Street, Kalgoorlie | 1897 | Witton's Directory |
| Imray | F. J. | Tobacconist; Bandmaster F.N.A. Vols. | Fremantle | 1887 | WA Almanack |
| Imray | F. J. | Bandmaster Naval Artill | Fremantle | 1888 | WA Almanack |
| Imray | F. J. | Bandmaster Naval Artily | Fremantle | 1889 | WA Almanack |
| Imray | F. J. | Barber & Stationer | John Street, North Fremantle | 1897 | Witton's Directory |
| Imray | Mrs | Boarding House Keeper | Parker's Range | 1897 | Witton's Directory |
| Ince | J. | Stationer and Fancy Goods | Albany | 1888 | WA Almanack |
| Ince | J. | Stationer and Fancy Goods | Albany | 1889 | WA Almanack |
| Ince | J. M. | Stationer | Albany | 1887 | WA Almanack |
| Indian Laundry | | | Murray Street, Perth | 1897 | Witton's Directory |
| Industrial School | Fowler, F. J. | Superintendent | Trafalgar Road, Perth | 1897 | Witton's Directory |
| Ines | F. | Farmer | Wattoning | 1897 | Witton's Directory |
| Ing | A. G. | General Agent | Hampton Road, Fremantle | 1897 | Witton's Directory |
| Ing | A. G. | Grocer | Hampton Road, Beaconsfield | 1897 | Witton's Directory |
| Ing | Mrs. L. | Storekeeper | Hampton Road, Fremantle | 1897 | Witton's Directory |
| Ing | S. G. | Jeweller | York | 1897 | Witton's Directory |