| Zani | T. F. | Sussex Loc. 2181, Margaret River | T1Z | 1962 |
| Zanich | Joseph | Fitzgerald Loc. 376, Salmon Gums | JZ0 | 1927 |
| Zanich | Matthew | Fitzgerald Locs. 370, 1121, Dowak (Esperance) | M5Z | 1926 |
| Zarat | Khan | Marble Bar | ZK2 | 1912 |
| Zarat | Khan | Marble Bar | ZK2 | 1924 |
| Zareen | - | Marble Bar and Nullagine, Marble Bar | ZA7 | 1924 |
| Zawadskyj | W. | 10629, 854, 21021, 19512, 12927, Boddington | W1Z and 28B, 13A | 1962 |
| Zecchin Son | C. & E. | 573, 140, 109, Cookernup | CZ6 | 1962 |
| Zeeb | Karb F. | Glenlea, Bridgetown | K1Z | 1924 |
| Zenti | G. | Rino, Bridgetown | 1JZ | 1962 |
| Zerbad | Mahomet | Mt. Margaret, Laverton | ZM0 | 1912 |
| Zerbad | Mahomet | Mt. Margaret, Laverton | ZM0 | 1924 |
| Zerke Bros. | - | Garthowen, Narrogin | ZB7 | 1912 |
| Zerke Bros. | - | Garthowen, Narrogin | ZB7 | 1924 |
| Zerrack | (Afghan) | Carnarvon | 9ZK | 1924 |
| Zilko | Geo. | No. 1 Hector Street, Oaborne Park | GZ4 | 1924 |
| Zimmerman | K. & R. | Plantagenet Loc. 2446, Albany | K3Z and 114B, 38A | 1962 |
| Zinkler | Albert | Homestead Farm 7786, Wickepin | 4AZ | 1924 |
| Zinkler | Otto | Loc. No. 7787, Wickepin | OZ7 | 1912 |
| Zinkler | Otto | Location No. 7787, Wickepin | OZ7 | 1924 |
| Zis | A & V. | Noondercutting, Erikin | Z1S and 19B, 37A | 1962 |
| Zis | J. & B. J. | Meander, Kukerin | 1HN and 10D, 21E | 1962 |
| Zis | J. J. | Kwolyin Hill, Kwolyin | 8AZ and 50B, 48E | 1962 |
| Zis Bros. | Vincent & Mitchell | 13361/74, 13362/74, 22933/55, Kellerberrin | Z1S | 1912 |
| Zis Bros. | Vincent & Mitchell | 13361/74, 13362/74, 22933/55, Kellerberrin | Z1S | 1924 |
| Zito | G. | 3886, Kirup | 9JZ and 113D, 11E | 1962 |
| Zoar | Andrew Tangott | Location 15604, Merredin | A3Z | 1924 |
| Zoccoli | G. | Lot 1, Wokalup | JZ2 and 47B, 119E | 1962 |
| Zoeller | Carl | Howard Station, Perth | 2CZ | 1924 |
| Zoite | S. | 19973, Merredin | SZ7 and 8B, 106A | 1962 |
| Zowe | Ben | Lease No. 93E, Boulder City | Z0E | 1924 |
| Zowe & Daff | - | Butchers, Boulder City | Z8D | 1912 |
| Zowe & Daff | - | Butchers, Boulder City | Z8D | 1924 |
| Zuliani | A. & P. R. | 9337, 9335, Jardee | 2ZA and 20B, 38E | 1962 |
| Zuvela | K. | 395, 855, 393, 444, Lime Kilns 913 Mile Trans Line | K2Z and 49B, 103E | 1962 |
| Zuvela-Doda | M. | Locs. 395, 855, 393, 444, Lime Kilns 913 Mile Trans Line | MZ6 and 36B, 20E | 1962 |
