| Offer | R. H. | Lilyvale Farm, Esperance 146-7, Wellington Part Locs. 1 and 48, Burekup | HO7 and 14C 27A | 1962 |
| Offer | R. T. | Benton, Benger | T0E and 5D, 11E | 1962 |
| Offer | Thos. | Benton, Benger | T0E | 1912 |
| Offer | Thos. | Benton, Benger | T0E | 1924 |
| Offer & Sons | F. T. | Lilyvale Farm, Esperance 146-7, Wellington Part Locs. 1 and 48, Burekup | 0XF and 12C, 13A | 1962 |
| Ogden | A. J. | Pichi Richie, Bridgetown | 0GD and 18D, 47E | 1962 |
| Ogden | Bertram A. | Springvale and Corda Valley, Wyndham | JF7 | 1924 |
| Ogden | C. H. | Commonage, Westonia | N6L | 1924 |
| Ogden | C. M. | Kia-Ora, Kudardup | M0Q | 1962 |
| Ogden | J. E. | Blackwood Valley, 2895, 853, Nannup | R2Y and 102D, 4E | 1962 |
| Ogden | W. H. | Loc. 20763, Burracoppin | N6L and 58F, 80B | 1962 |
| Ogden | W. W. | The Grange, Eulyamartup | 7WO | 1912 |
| Ogden | W. W. | The Grange, Elyamartup | 7WO | 1924 |
| Ogilvie | David | Toiler's Camp, Hall's Creek | V4D | 1924 |
| Ogilvie | I. & E. | Avon Loc. 23440, Narrembeen | 2OO and 8B, 112E | 1962 |
| Ogilvie | John | Mt. Willoughby, Northampton | 3OY | 1924 |
| Oglivie | L. | Ninghan Locs. 1959, 1961, 3097, Mukinbudin | L1O and 21B, 24A | 1962 |
| Ognenis | C. | Loc. 7291 of Nelson, Manjimup | C4O and 109B, 35A | 1962 |
| Ognenis | N. C. | 9473 Donnelly Rd. Manjimup | XN0 | 1962 |
| Ognenis | V. | Nelson Loc. 9482, Manjimup | OV4 | 1962 |
| Ohl | Paul | Baronia, Capel | PO1 | 1912 |
| Ohl | Paul | Baronia, Capel | PO1 | 1924 |
| Ohlsson | Peter | Jarrahdale | 4YZ | 1924 |
| Ohrt | G. S. | Warniminup, Katanning | 5DE and 35B, 25E | 1962 |
| Oinn | E. T. (jnr.) | Sunnycrest, Serpentine | EO4 and 102D, 23E | 1962 |
| Okely | Mrs jane | Carine Grange, Wanneroo | J4O | 1924 |
| Okely | Mrs. Jane | Carine Grange | J4O | 1912 |
| Okes | Fred | Two Hills | LZ7 | 1912 |
| Okes | Fred. | Two Hills, Nungarin | LZ7 | 1924 |
| Okes | Walter | Knob Peak | W7O | 1912 |
| Okes | Walter | Knob Peak, Wyndham | W7O | 1924 |
| Okes, Durack, Kimberley Oil Co. (No Liability) | - | Lease 32H, East Kimberley | K8O | 1924 |
| Old | Chas. E. | Kalguddering, Wongan Hills P. O. | E4O | 1924 |
| Old | S. J. | Plantagenet Loc. 5780, Albany | SJ7 and 80B, 22A | 1962 |
| Olden | D. A. & H. J. | Carranya, Tambellup | OD0 and 112B, 45A | 1962 |
| Olden | K. L. & H. J. | Dartnell, Tambellup | QB5 and 26B, 6A | 1962 |
| Olden | S. A. | 6317, 8210, Bowgada | SO7 and 11B, 12A | 1962 |
| Oldfield | Arthur F. | Brooklands, Nuralingup | A5O | 1926 |
| Oldfield | E. M. | Nelson 1507, 1679, 1642, Kojonup | E0X and 22B, 108A | 1962 |
| Oldfield | F. | Sussex Loc. 2255, Treeton, via Cowaramup | FU0 | 1962 |
| Oldfield | J. H. | Brooklands, Forrest Grove | A5O and 19C, 107E | 1962 |
| Oldfield | Oscar | Lot No. 6 | OO2 | 1912 |
| Oldfield | Oscar | Lot No. 6, Doodlakine | OO2 | 1924 |
| Oldfield | Oswald | Lot 7, Doodlakine | 2QO | 1924 |
| Oldfield | T. W. | Sussex Loc. 971, Wonnerup | KZ6 | 1924 |
| Oldfield | Thomas W. | Sussex Loc. 971, Wonerup | KZ6 | 1925 |
| Oldham | C. L. R. | Avon 27662, Northam | OO8 and 113B, 10A | 1962 |
| Oldham | H. & P. M. | 551 Forrest Springs, Pinjarra | I0U and 109B, 47A | 1962 |
| Oldham | John | Pine Grove, glen Iris, via Bunbury | OL9 | 1924 |
| Oldham | P. M. | Elandra, Marybrook, via Busselton | 0MP | 1962 |
