The electorate of Finniss includes Back Valley, Currency Creek, Encounter Bay, Finniss, Goolwa, Goolwa Beach, Goolwa North, Goolwa South, Hayborough, Hindmarsh Island, Hindmarsh Tiers, Hindmarsh Valley, Lower Inman Valley, McCracken, Middleton, Mosquito Hill, Mount Compass, Mount Observation, Mundoo Island, Nangkita, Port Eliot, Tooperang, Victor Harbor and Waitpinga, as well as part of Inman Valley.