Mount Barker is an expanding city, home to 10 258 residents that is 33 kilometres up the South Eastern Freeway, east of Adelaide, in South Australia. It is the seat of the District Council of Mount Barker, is the largest town in the Adelaide Hills, and is one of the fastest growing areas in the state. Mount Barker is close enough to Adelaide that many people commute there on a daily basis, although it is far enough away from the city that people call it "the country".
Mount Barker lies at the base of a local mountain of the same name, called the Mount Barker summit by locals. It is 50 kilometres from the Murray River. Mount Barker was traditionally a farming area, and many of the lots just outside the town area are farming lots, although some of them have been replaced with new subdivisions in recent times.