The state of South Dakota has 66 counties in total. Bon Homme County is the oldest (founded in 1862), while Jones County is the youngest (established in 1916).

Minnehaha County is the most populous, with a population of 169,468 people. Meade County has the most land area (8,990 km2), while Clay County has the smallest (1,067 km2).

Please find all South Dakota counties listed alphabetically below.

• Aurora County, SD
• Beadle County, SD
• Bennett County, SD
• Bon Homme County, SD
• Brookings County, SD
• Brown County, SD
• Brule County, SD
• Buffalo County, SD
• Butte County, SD
• Campbell County, SD
• Charles Mix County, SD
• Clark County, SD
• Clay County, SD
• Codington County, SD
• Corson County, SD
• Custer County, SD
• Davison County, SD
• Day County, SD
• Deuel County, SD
• Dewey County, SD
• Douglas County, SD
• Edmunds County, SD
• Fall River County, SD
• Faulk County, SD
• Grant County, SD
• Gregory County, SD
• Haakon County, SD
• Hamlin County, SD
• Hand County, SD
• Hanson County, SD
• Harding County, SD
• Hughes County, SD
• Hutchinson County, SD
• Hyde County, SD
• Jackson County, SD
• Jerauld County, SD
• Jones County, SD
• Kingsbury County, SD
• Lake County, SD
• Lawrence County, SD
• Lincoln County, SD
• Lyman County, SD
• Marshall County, SD
• McCook County, SD
• McPherson County, SD
• Meade County, SD
• Mellette County, SD
• Miner County, SD
• Minnehaha County, SD
• Moody County, SD
• Pennington County, SD
• Perkins County, SD
• Potter County, SD
• Roberts County, SD
• Sanborn County, SD
• Shannon County, SD
• Spink County, SD
• Stanley County, SD
• Sully County, SD
• Todd County, SD
• Tripp County, SD
• Turner County, SD
• Union County, SD
• Walworth County, SD
• Yankton County, SD
• Ziebach County, SD