- Aurora County
- Beadle County
- Bennett County
- Black Hills
- Bon Homme County
- Brookings County
Bordering Minnesota in the
east-central part of South Dakota. Cities include Brookings, Arlington and Elkton
- Brown County
- Brule County
- Buffalo County
- Butte County
- Campbell County
- Charles Mix County
- Clay County
- Codington County
Located in northeastern South Dakota. Cities include Watertown, Florence and Henry
- Corson County
- Custer County
- Davison County
- Day County
- Deuel County
- Dewey County
- Douglas County
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- Edmunds County
- Fall River County
- Faulk County
- Grant County
- Gregory County
- Haakon County
- Hamlin County
- Hand County
- Hanson County
- Hughes County Hutchinson
- County
- Hyde County
- Jackson County
- Jerauld County
- Jones County
- Kingsbury County
- Lake County
- Lawrence County
- Lincoln County
- Lyman County
- Marshall County
- McCook County
- McPherson County
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- Meade County
- Mellette County
- Miner County
- Minnehaha County
Bordering Minnesota in the
southeastern part of South Dakota. Cities include Sioux Falls, Brandon and Baltic
- Moody County
- Pennington County
- Perkins County
- Potter County
- Roberts County
- Sanborn County
- Shannon County
- Spink County
- Stanley County
- Sully County
- Todd County
- Tripp County
- Turner County
- Union County
- Walworth County
- Yankton County
Located in southeastern part of South Dakota, bordering Minnesota. Cities include Yankton, Gayville and Lesterville
- Ziebach County
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