The Division of Barker is an Australian Electoral Division in the south-east of South Australia.The 63,886 km² seat currently stretches from Morgan in the north to Port MacDonnell in the south, taking in the Murray Mallee, the Riverland, the Murraylands and most of the Barossa Valley, and includes the towns of Barmera, Berri, Bordertown, Keith, Kingston SE, Loxton, Mannum, Millicent, Mount Gambier, Murray Bridge, Naracoorte, Penola, Renmark, Tailem Bend, Waikerie, and parts of Nuriootpa and Tanunda.The division was established on 2 October 1903, when South Australia's original single multi-member division was split into seven single-member divisions.