[2] The county covers the southern part of the Eyre Peninsula “bounded on the north by a line connecting Point Drummond with Cape Burr, and on all other sides by the seacoast, including all islands adjacent to the main land.”[4][5] The county was proclaimed by George Grey, the third Governor of South Australia, on 2 June 1842.

It covers an area of 400 square kilometres (153 sq mi) and its name was derived from William Patrick Cummins, a member of the South Australian Parliament from 1896 to 1907.

It covers an area of 260 square kilometres (101 sq mi) and its name was derived from Matthew Flinders, the British navigator.

[7] The Hundred of Hutchison was proclaimed in 1867 and is home to Tumby Bay township and surrounds as well as a small eastern portion of Yallunda Flat locality.

It covers an area of 280 square kilometres (110 sq mi) and its name is derived from an Aboriginal word meaning ‘oysters’.

It covers an area of 270 square kilometres (104 sq mi) and its name is derived from the settlement of Port Lincoln.

Its extent includes the full extent of the localities of Point Boston, Poonindie, Louth Bay, Whites Flat and Whites River, parts of the localities of Charlton Gully, Green Patch, North Shields, Tumby Bay and Wanilla as well as all of the island of Louth Island.

It covers an area of 310 square kilometres (120 sq mi) and its name is derived from William Tennant Mortlock who was a member of the South Australian Parliament and was reported as being “a large landholder on the Eyre Peninsula.” Its extent includes the full extent of the locality of Edillilie in its south while a part of the locality of Cummins occupies part of its north.

It covers an area of 190 square kilometres (72 sq mi) and its name is derived from the body of water known as Sleaford Bay.

It covers an area of 330 square kilometres (128 sq mi) and its name is derived from “a village in Gloucestershire, England."