| Rank |
County |
Population (2012) |
| 1 |
Minnehaha County, South Dakota
|
175,037
|
| 2 |
Pennington County, South Dakota
|
104,347
|
| 3 |
Lincoln County, South Dakota
|
48,296
|
| 4 |
Brown County, South Dakota
|
37,331
|
| 5 |
Brookings County, South Dakota
|
32,629
|
| 6 |
Codington County, South Dakota
|
27,606
|
| 7 |
Meade County, South Dakota
|
26,052
|
| 8 |
Lawrence County, South Dakota
|
24,397
|
| 9 |
Yankton County, South Dakota
|
22,603
|
| 10 |
Davison County, South Dakota
|
19,769
|
| 11 |
Beadle County, South Dakota
|
17,753
|
| 12 |
Hughes County, South Dakota
|
17,450
|
| 13 |
Union County, South Dakota
|
14,855
|
| 14 |
Clay County, South Dakota
|
14,131
|
| 15 |
Shannon County, South Dakota
|
14,059
|
| 16 |
Lake County, South Dakota
|
11,771
|
| 17 |
Roberts County, South Dakota
|
10,303
|
| 18 |
Butte County, South Dakota
|
10,228
|
| 19 |
Todd County, South Dakota
|
9,942
|
| 20 |
Charles Mix County, South Dakota
|
9,216
|
| 21 |
Custer County, South Dakota
|
8,339
|
| 22 |
Turner County, South Dakota
|
8,308
|
| 23 |
Grant County, South Dakota
|
7,259
|
| 24 |
Hutchinson County, South Dakota
|
7,187
|
| 25 |
Bon Homme County, South Dakota
|
7,029
|
| 26 |
Fall River County, South Dakota
|
6,971
|
| 27 |
Spink County, South Dakota
|
6,611
|
| 28 |
Moody County, South Dakota
|
6,446
|
| 29 |
Hamlin County, South Dakota
|
5,918
|
| 30 |
Day County, South Dakota
|
5,613
|
| 31 |
McCook County, South Dakota
|
5,610
|
| 32 |
Dewey County, South Dakota
|
5,538
|
| 33 |
Tripp County, South Dakota
|
5,485
|
| 34 |
Walworth County, South Dakota
|
5,459
|
| 35 |
Brule County, South Dakota
|
5,293
|
| 36 |
Kingsbury County, South Dakota
|
5,220
|
| 37 |
Marshall County, South Dakota
|
4,671
|
| 38 |
Deuel County, South Dakota
|
4,380
|
| 39 |
Gregory County, South Dakota
|
4,265
|
| 40 |
Corson County, South Dakota
|
4,077
|
| 41 |
Edmunds County, South Dakota
|
4,026
|
| 42 |
Lyman County, South Dakota
|
3,789
|
| 43 |
Clark County, South Dakota
|
3,585
|
| 44 |
Bennett County, South Dakota
|
3,436
|
| 45 |
Hand County, South Dakota
|
3,388
|
| 46 |
Hanson County, South Dakota
|
3,377
|
| 47 |
Jackson County, South Dakota
|
3,191
|
| 48 |
Perkins County, South Dakota
|
3,037
|
| 49 |
Douglas County, South Dakota
|
2,970
|
| 50 |
Stanley County, South Dakota
|
2,969
|
| 51 |
Ziebach County, South Dakota
|
2,869
|
| 52 |
Aurora County, South Dakota
|
2,742
|
| 53 |
McPherson County, South Dakota
|
2,439
|
| 54 |
Faulk County, South Dakota
|
2,377
|
| 55 |
Potter County, South Dakota
|
2,359
|
| 56 |
Miner County, South Dakota
|
2,326
|
| 57 |
Sanborn County, South Dakota
|
2,324
|
| 58 |
Mellette County, South Dakota
|
2,101
|
| 59 |
Jerauld County, South Dakota
|
2,047
|
| 60 |
Buffalo County, South Dakota
|
2,020
|
| 61 |
Haakon County, South Dakota
|
1,939
|
| 62 |
Hyde County, South Dakota
|
1,437
|
| 63 |
Sully County, South Dakota
|
1,427
|
| 64 |
Campbell County, South Dakota
|
1,396
|
| 65 |
Harding County, South Dakota
|
1,316
|
| 66 |
Jones County, South Dakota
|
1,013
|