Download coordinates as: The County of Adelaide is one of the 49 cadastral counties of South Australia and contains the city of Adelaide.

[2][4] It was proclaimed on 2 June 1842 by Governor Grey.

It is bounded by the Gawler River and North Para River in the north, the Mount Lofty Ranges in the east, and Gulf St Vincent in the west.

The county held at least 60% of South Australia's population between 1855 and 1921; this figure rose to 70.6% in 1966.

[5] The county is divided into the following hundreds, from north west to south east: