| Middleton | W. J. | 419, 439, 835-6, Denmark | YC1 and 120B, 30E | 1962 |
| Middleton | Walter Wm. | Springdale, Wokalup | WM6 | 1912 |
| Middleton | Walter Wm. | Springdale, Wokalup | WM6 | 1924 |
| Middleton & Appleton | A. & G. N. | Nayliring, Piesseville | M1A and 80B, 37A | 1962 |
| Mielke | Herman | Forrest Hill, Wickepin | M1V | 1912 |
| Mielke | Herman | Forrest Hill, Wickepin | M1V | 1924 |
| Mielke | O. H. A. | Rosenthal Farm, Wickepin | OM2 | 1912 |
| Mielke | O. H. A. | Good Hope Farm, Wellard, Peel Estate | OM2 | 1924 |
| Miell | O. S. | The Meadows, Mukinbudin | S4M and 46C, 33E | 1962 |
| Mighall | B. N. | 22047, 24311, 24343, Koorda | NM7 and 23A, 37B | 1962 |
| Mighall | E. M. | Sunnyside, Koorda | R5M and 20B, 30E | 1962 |
| Mighall | N. & L. C. | Vine hall, Koorda | NM1 and 18D, 114E | 1962 |
| Migual | P. E. D. & F. C. | Ellendale, Perenjori | 7MU and 120D, 14E | 1962 |
| Miguel | A. H. | Hope Valley, Naval Base | M8L | 1962 |
| Miguel | A. R. | Ningham Loc. 3134, Wailki | A1M and 8A, 41B | 1962 |
| Miguel | Angel de San | Happy Valley, Rockingham | 1SM | 1912 |
| Miguel | J. A. | Stock Road, Hamilton Hill | 4XN | 1924 |
| Miguel | J. A. | Happy Lake Farm, Wialki | 2JM and 38A, 50B | 1962 |
| Miguel | Mary De San | Miguel's Farm, Rockingham | LM2 | 1912 |
| Miguel | Mary De San | Miguel's Farm, Rockinham | LM2 | 1924 |
| Milbank | Geo. R. | Yundamindera, Commonage, Yundamindera | O1Z | 1912 |
| Milbank | Geo. R. | Yundamindera Commonage, Yundamindera | O1Z | 1924 |
| Milburn | Wm. | Alston, Bendering | BM8 | 1924 |
| Milburn & Son | W. J. | Loc. 16626, Kondinin | BM8 and 24A, 3B | 1962 |
| Mildwater Bros. | - | West River, Ravensthorpe | M8J | 1912 |
| Mildwater Bros. | - | West River, Ravensthorpe | M8J | 1924 |
| Mildwaters | C. H. R. | Allandale, Kukerin | XL7 and 23A, 28C | 1962 |
| Mildwaters | Ed. | Carlshem, Wagin | 9EM | 1912 |
| Mildwaters | Ed. | Carlshem, Wagin | 9EM | 1924 |
| Mildwaters | G. S. V. | Rose hill Wagin | FU9 and 41D, 52F | 1962 |
| Mildwaters | R. W. | Ben Lomand Farm, Ongerup | U4E | 1924 |
| Mileham | E. C. | Lot 234, Jandakot | NE2 | 1924 |
| Milenra Pastoral Co. Ltd. | - | Milenra Station, Cue | ER0 and 12B, 7E | 1962 |
| Miles | A. & E. | Eureka Farm, Kondut | 41D and 41D, 52F | 1962 |
| Miles | A. W. | Boyadine, Beverley | 1GG and 5B, 38A | 1962 |
| Miles | Albert | Kondut, via Ballidu | U3M | 1924 |
| Miles | Amelia | The Farm, Brookton | GM5 | 1927 |
| Miles | C. R. | Sussex Loc. 2723, Karridale | R9M | 1962 |
| Miles | D. V. & R. J. | Hillview, Dowerin | T9O and 10B, 34A | 1962 |
| Miles | E. J. | Southampton, Balingup | MZ0 and 21D, 7E | 1962 |
| Miles | Edwin G. | Brooklyn, Wagerup | MQ6 | 1924 |
| Miles | F. & A. E. | Cleveleys, coorow | 2MF and 43A, 33C | 1962 |
| Miles | G. J. | Plantagenet 6460, Cojenerup, via Mt. Barker | 0PP and 17A, 67B | 1962 |
| Miles | Geo. T. | The Farm, Brookton | GM5 | 1924 |
| Miles | Geo. W. | Marble Bar Common, Marble Bar | 1GG | 1912 |
| Miles | Geo. W. | Marble Bar Common, Marble Bar | 1GG | 1924 |
| Miles | George T. | The Farm, Brookton | GM5 | 1912 |
| Miles | J. E. & B. A. L. | 4081, 2451, 4115, 2659, Warner Glen, via Karridale | EA3 and 119B, 46E | 1962 |
| Miles | J. R. | Loc. 5482, Manjimup | 6YC | 1962 |
| Miles | L. A. | Maida Vale, Bayswater | 4LM | 1962 |
