| Inman | George Walker | Romali, Dukin | GM1 | 1926 |
| Innes | A. J. | W.S.L.S. A.1153, Denbarker | AJ9 and 17B, 49A | 1962 |
| Innes | A. J. | Hawkhurst, Kendenup | ZW9 | 1962 |
| Innes | K. E. | Victoria Loc. 5671, Latham | KE1 and 48B, 43E | 1962 |
| Innes | W. V. (Mrs) | Ulichatopping, Doodlakine | WV0 and 38A, 44B | 1962 |
| Innocent | D. G. | 31-2 Pingelly | 6DD and 20B, 20A | 1962 |
| Innocent | T. W. | Barsrettop Bunjil | TW7 and 11B, 105A | 1962 |
| Innouendy Pastoral Co. | - | Innouendy Station, Cue | 1DD and 12B, 13A | 1962 |
| Innouendy Pastoral Co. | - | Past Lease 394/521, Cue | 7DD and 28C, 5A | 1962 |
| Innouindy Pastoral Co. Ltd. | - | Innouindy Station, Yalgoo | 1DD | 1924 |
| Inverarity | D. H. | Dinirimup, Kellerberrin | 1ND | 1912 |
| Inverarity | D. H. | Dinirimup, Kellerberrin | 1ND | 1924 |
| Inverarity | R. M. | Booyah Park, Kellerberrin | 1ND and 6D, 33E | 1962 |
| Inverarity Rodier & Peacock | - | Pintherka Well, North Morowa via Mingenew | 6RP | 1912 |
| Inverarity, Rodier & Peacock | - | Pintherka Well, North Morowa, via Mingenew | 6RP | 1924 |
| Inwood | William Thomas | Block 484, Kendenup | 1NW | 1926 |
| Ion | H. J. | Ten-En, Victoria 10254, Eneabba, via Three Springs | 1ON and 42E, 1C | 1962 |
| Ions | Mark | Fitzgerald Loc. 1022, Dowak via Norseman | MD1 | 1927 |
| Ipsen | J. S. | Mayfield, Balbarrup | JZ3 | 1912 |
| Ipsen | J. S. | Mayfield, Balbarrup | JZ3 | 1924 |
| Iredell | F. M. | Drummonds, Loc No. 4461-60, 4413, Manjimup | UF1 | 1962 |
| Iredell | J. S. | Blocks 5282 and 5283, Balbarrup | JZ7 | 1912 |
| Iredell | J. S. | Blocks 5282 and 5283, Balbarrup | JZ7 | 1924 |
| Iredell | T. M. | 4413, 4460, 4461 port, Manjimup | G2D and 38C, 27E | 1962 |
| Ireland | C. R. & H. | White Peak, Geraldton | 1WP and 118E, 54F | 1962 |
| Ireland | E. | Suusex 2894-7, Rosa Brook, Margaret River | 1RE and 37B,71E | 1962 |
| Ireland | G. R. | Nelson Loc. 8340, Merredin | R1G and 117B, 21A | 1962 |
| Ireland | John | Homestead, West Collie | JJ8 | 1912 |
| Ireland | John | Homestead, West Collie | JJ8 | 1924 |
| Ireland | Leslie | Teddington Road, Victoria Park | VU7 | 1924 |
| Ireland | M.C. | 17 Salsbury Street, Bayswater | QG1 | 1962 |
| Ireland | Margaret C. | Roselea, Nedlands | QG1 | 1924 |
| Ireland | N. R. | Ferndale, Ongerup | ZR8 and 24E, 43C | 1962 |
| Ireland | V. C. | Yongermere, Borden | VC1 and 114A, 19B | 1962 |
| Ireland & Wheeldon | W. & E. A. | Woodlands, Northampton | UW1 | 1924 |
| Irlam | R. B. | Peninsula, Maylands | R8J | 1912 |
| Irlam | R. B. | Peninsula, Maylands | R8J | 1924 |
| Ironmonger | C. C. | Kinville, Karridale | UC8 | 1962 |
| Ironmonger | C. H. | Colmyn, Karridale | H4W and 10C, 49A | 1962 |
| Ironmonger | Charles H. | Woodvale, Wonnerup | H4W | 1927 |
| Irvin | Samuel | Hazeldere, Mt. Barker | S1V | 1912 |
| Irvin | Samuel | Hazeldene, Mt. Barker | S1V | 1924 |
| Irvine | A. E. | Dowerin | AE6 | 1924 |
| Irvine | Hans W. H. | Kockatea, Mullewa | 1HU | 1912 |
| Irvine | Hans W. H. | Kockatea, via Mullewa | 1HU | 1924 |
| Irvine | J. T. | Passen Dale,Chidlows | DT0 and 33A, 117B | 1962 |
| Irvine | M. A. | Sandhurst, Dowerin | AE6 and 27A, 3C | 1962 |
| Irvine | Margaret | Daylup, Esperance Bay | 1RV | 1912 |
| Irvine | R. S. | Taradale, Queens Park | S1V | 1962 |
| Irvine | Robert | Oakfield Farm, Yellingup, Katanning East | 7NE | 1912 |
