The Commonwealth Electoral Division of Mayo covers the area from Springton in the north to Goolwa in the south. It includes the Adelaide Hills, Fleurieu Peninsula and Kangaroo Island. Country towns include Birdwood, Bridgewater, Crafers, Echunga, Gumeracha, Hahndorf, Langhorne Creek, Lobethal, Macclesfield, Mount Barker, Myponga, Oakbank, Stirling, Strathalbyn, Victor Harbor, Woodside, Yankalilla and McLaren Vale, McLaren Flat and Willunga