Mount Barker is a town on the Albany Highway and is the administrative centre of the Shire of Plantagenet in the Great Southern region of Western Australia. At the 2016 census, Mount Barker had a population of 1,905. The town was named after the nearby hill, which in turn was named in 1829 by Thomas Braidwood Wilson in honour of Captain Collet Barker, who was in command of Western Australia's original British settlement at King George's Sound from 1829 to 1831.
