The City covers an area of 560 square kilometres (216 sq mi), much of which is state forest rising into the Darling Scarp to the east, and had a population of almost 80,000 as at the 2016 Census.

Prior to European settlement, the area now known as the City of Armadale was part of the land that was occupied by the Aboriginal Noongar people.

[4] On 1 July 1979 it became the Town of Armadale and on 16 November 1985 it assumed its current name when attained city status.

[3] The City of Armadale maintains 615 km of roads and a little over 14 km² of parks and gardens.

The suburbs of the City of Armadale with population and size figures based on the most recent Australian census:[6][7] As of 2024[update], 162 places are heritage-listed in the City of Armadale,[28] of which 13 are on the State Register of Heritage Places, among them Araluen Botanic Park, the Canning Contour Channel and the Old Jarrah Tree.