King is a single-member electoral district for the South Australian House of Assembly.

It was created by the redistribution conducted in 2016, and was contested for the first time at the 2018 state election.

[1] The Electoral District Boundaries Commission considered that it had renamed the electoral district of Napier to King, but only 1479 of the estimated 27,002 voters in King had previously been voters in Napier from the rural areas of Bibaringa, One Tree Hill, Uleybury, Yattalunga.

It is on the western foothills of the Mount Lofty Ranges at the northern end of Adelaide.

The 2020 redistribution has moved the northern boundary south to Uley Road which has resulted in the movement of the suburbs of Bibaringa, Uleybury and Yattalunga which were part of the former Electorate of Napier to Schubert.