Middlesex, Western Australia
| Middlesex Western Australia | |||||||||||||||
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| Coordinates | 34°18′12″S 116°10′44″E / 34.30326°S 116.17890°E | ||||||||||||||
| Population | 232 (SAL 2021) | ||||||||||||||
| Postcode(s) | 6258 | ||||||||||||||
| Area | 82.7 km2 (31.9 sq mi) | ||||||||||||||
| Location | |||||||||||||||
| LGA(s) | Shire of Manjimup | ||||||||||||||
| State electorate(s) | Warren-Blackwood | ||||||||||||||
| Federal division(s) | O'Connor | ||||||||||||||
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Middlesex is a rural locality of the Shire of Manjimup in the South West region of Western Australia. The locality's western border is formed by the South Western Highway while the Muir Highway forms its eastern border. A small section of the Sir James Mitchell National Park is also located within Middlesex.
Middlesex is located on the traditional land of the Bibulman people of the Noongar nation.
The locality is also home to three heritage listed sites, the Middlesex Hall, the former school house and the former Group Settler's Cottage.