Pinjarra is a town in the Peel region of Western Australia along the South Western Highway, 82 kilometres from the state capital, Perth and 21 …Pinjarra is a town in the Peel region of Western Australia along the South Western Highway, 82 kilometres from the state capital, Perth and 21 kilometres south-east of the coastal city of Mandurah. Its local government area is the Shire of Murray. At the 2016 census, Pinjarra had a population of 4910.