Mount Barker is a town of about 1,700 people on the Albany Highway and is the administrative centre of the Shire of Plantagenet in the Great Southern region of Western Australia. The shire has a population of around 4,300 people.
The town was named after the nearby hill, which it is believed was named by Dr T B Wilson RN, in honour of Captain Collet Barker.
Mount Barker is situated on Albany Highway 360 kilometres (224 mi) south of Perth and 50 kilometres (31 mi) north of the city of Albany. The coastal town of Denmark is around 50 kilometres (31 mi) by road to the south-west via the Denmark Mount Barker Road (locally referred to as “Denbarker Road”). The timber town of Manjimup is 162 kilometres (101 mi) west of Mount Barker, via Muir’s Highway. The Hay River, which flows into Wilson Inlet at Denmark, begins its journey just west of Mount Barker.