The City of Cockburn is a local government area in the southern suburbs of the Western Australian capital city of Perth about 8 kilometres (5 mi) south of Fremantle and about 24 kilometres (15 mi) south of Perth's central business district. The City covers an area of 167.5 square kilometres (64.7 sq mi) and had a population of over 104,000 as at the 2016 Census.

The City of Fremantle is a local government area in the south of Perth, Western Australia. The City covers an area of 19.0 square kilometres (7.3 sq mi), and lies about 19 kilometres (12 mi) southwest of the Perth central business district.