| I'Anson | D. L. & M. J. | Greenwood, Darkan | MA1 and 16C, 6A | 1962 |
| Ibbotson | Reginald J. | Lyndhurst, 5th Street, Harvey | RM1 | 1927 |
| Ibbotson & Smith Bros. | - | Mooloogore, via Meekatharra | SX1 | 1924 |
| Ibbs | G. | Chandala, Muchea | 1WU and 113A, 11B | 1962 |
| Ibister & Pfitzner | - | Pt. Zongala, Morawa | E0P and 45E, 41D | 1962 |
| Ibister & Sons | J. | Homewood, Moora | 1BZ and 22C, 45,A | 1962 |
| Ickeringill | Thos. S. | Crown Lands, Bullfinch | 7KS | 1924 |
| Ieraci Bros. | - | Coolup No. A.A. lots 235-2-4, 255-6, Harvey, Wellington Loc. 653, 4087, 3530, Coolup and Harvey | RT6 and 118A, 116B | 1962 |
| Ietto | D. | Loc. 183, Harvey | D8G and 116D, 44E | 1962 |
| Iffla | A. S. | 5949, 5952, SOuth Stirling via Mt. Barker | QK1 and 17C, 42E | 1962 |
| Iffla | Anne Eliz. | Nelson Loc. 4043, Nannup | F5O | 1924 |
| Iffla | Harold A. | Yellanup, Porongorup Mail, via Mt. Barker | QK1 | 1924 |
| Iffla & Millar | H. A. H. & A. | Ahgl Dere, Iffley, via Nannup | FF9 | 1924 |
| Ignotti | A. | Bellview, Loc. 3857, Witchcliffe | AB3 | 1962 |
| Ilbery | W. S. | Quanaminning, Wogolin Road, East Wickepin | WQ1 | 1924 |
| Iles | F. J. | Scarborough Farm, Cumminin | 4LE | 1912 |
| Iles | F. J. | Scarborough Farm, Kumminin | 4LE | 1924 |
| Iles | Felix Wm. | Olivia Terrace, Carnarvon | F8V | 1924 |
| Iles | Francis Herbert | East Kumminin, via Bruce Rock | F7V | 1924 |
| Iles | G. A. & H. D. | 27183 Sussex Loc, Margaret River | TN9 and 110D, 84E | 1962 |
| Iles | Geo. | Block 15592, Nangeenan | 7GN | 1912 |
| Iles | Geo. | Block 15592, Nangeenan | 7GN | 1924 |
| Iles | John E. | Sunnyside Farm, Carnamah | XE8 | 1924 |
| Iles | John W. | Emu Hill | J7X | 1924 |
| Iles | R. G. L. | Ella-Valla, Canarvon | RG2 and 5B, 26E | 1962 |
| Iles | Robt. Geo. L. | Commonage, Carnarvon | RG2 | 1924 |
| Iles | T. C. | Avon Loc. 15872, East Kuminin | TN9 | 1924 |
| Iles | Thos. | Hope Farm, Northern Gully | OT1 | 1912 |
| Iles | Thos. | Hope Farm, Northern Gully | OT1 | 1924 |
| Iles | W. J. | 26, Dardanup | G8J | 1962 |
| Iles | Wm. Geo. | Commonage, Carnarvon | WG7 | 1912 |
| Iles | Wm. Geo. | Commonage, Carnarvon | WG7 | 1924 |
| Ilesiuha | Chas. | Pt. Hedland and Wodgina via Laverton, Wodgina | CJ3 | 1912 |
| Ilesiuha | Chas. | Port Hedland and Wodgina, via Laverton | CJ3 | 1924 |
| Illidge | Henry | Cameron's Run, Kalamunda | OG1 | 1924 |
| Illingworth | Edwd. P. | Ewlyamartup, via Katanning | 9UX | 1924 |
| Illingworth | Mrs L. | Rose Farm, Bunbury | L0L | 1924 |
| Illingworth | Mrs. L. | Rose Farm, Bunbury | L0L | 1912 |
| Imberti | J. | Kojonup Locs. 4700, 4701, Boscabel, via Kojonup | A7X and 11D, 11E | 1962 |
| Imberti | P. & H. K. | Plant. 3152 and Kojonup 4368-71, 4500, Burakin | K1P and 30B, 71A | 1962 |
| Imms | John Robt. | Ethelglen, Jarnadup | Y9E | 1924 |
| Ince | W. | A.1194, Gairdner River | 1WO and 23E, 80C | 1962 |
| Inchley | William John | Group Loc. 10042, Group 121 Northcliffe | WJ1 | 1926 |
| Indar | Singh | Sunnyside, Hamilton Hill Swamp, Fremantle | SG8 | 1912 |
| Indar Singh | - | Sunnyside, Hamilton Hill Swamp, Fremantle | SG8 | 1924 |
| Ingamells | R. T. | Northcliffe 12215, Manjimup queen-wood, Manjimup | RT0 and 16C, 108A | 1962 |
| Ingebong | T. | Lorna Glen Station, Wiluna | T6Y | 1962 |
| Ingham | T. G. | Skjellinup A.A. 251-5-6, Shackleton | T5G and 20C, 118 E | 1962 |
| Ingle | F. & M. | Ardsley, Carnamuh | FJ1 and 36A, 30B | 1962 |
| Ingleton | B. | Ningham 2964-5, Beacon | 1BB and 20D, 28F | 1962 |
