Postans is a semi-rural suburb located within the City of Kwinana in the southern part of the Perth metropolitan area, Western Australia. Approximately 35 kilometers south of the Perth CBD, Postans is bordered by Kwinana Beach to the west and Wellard to the east, with its boundaries defined by the Kwinana Freeway and the Kwinana industrial area. The suburb’s proximity to both industrial and residential precincts places it within one of Perth’s key industrial corridors, while still retaining large tracts of undeveloped land and nature reserves.

In terms of demographic composition, Postans is unique among Perth suburbs due to its very low residential population. The 2021 Census recorded no usual residents in Postans, reflecting its almost non-existent residential housing stock. This is primarily because the land is largely zoned for industrial, agricultural use, and special purposes rather than for suburban development. There are no established residential estates, with land parcels mostly allocated for buffer zones, infrastructure, and environmental conservation areas. The suburb is also home to facilities such as the Kwinana Wastewater Treatment Plant and various agricultural research stations.

Commercially, Postans is characterized by light and heavy industry such as manufacturing and storage, alongside significant public utilities. The expansive industrial presence supports the broader Kwinana industrial area, making Postans an important part of Perth’s economic infrastructure. There is minimal retail or service industry in the suburb, as most economic activity revolves around industrial operations, environmental management, and government services. Postans is an example of a suburb shaped by industrial planning, lying at the intersection of nature reserves, infrastructure corridors, and Perth’s south-western industrial heartland.