Found from the coast of Western Australia through central Australia to the north-west of New South Wales and western Queensland.
The species distribution is poorly defined within its northern limits however it is absent from wetter areas of eastern Australia and south-western Western Australia.

Pseudonaja mengdeni is practically found throughout all dry to arid areas including, woodlands, Boree woodlands, sandhill woodlands, mallee woodlands, spinifex deserts, spinifex-covered dunefields, sandplains, stony plains, croplands, grasslands and temperate sclerophyll forests.
The Western brown snake often found within fallen timber, dead trees, shrubs, native grasses and ground cavities.
Found from the coast of Western Australia through central Australia to the north-west of New South Wales and western Queensland. The species distribution is poorly defined within its northern limits however it is absent from wetter areas of eastern Australia and south-western Western Australia.
Pseudonaja mengdeni is practically found throughout all dry to arid areas including, woodlands, Boree woodlands, sandhill woodlands, mallee woodlands, spinifex deserts, spinifex-covered dunefields, sandplains, stony plains, croplands, grasslands and temperate sclerophyll forests. The Western brown snake often found within fallen timber, dead trees, shrubs, native grasses and ground cavities.
Pseudonaja mengdeni