37 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clark | 1 | 1,175 | 1,151 | 0.34% | 868 | 1 | City |
| Mount Pleasant | 2 | 272 | 257 | 0.37% | 8 | 36 | Township |
| Willow Lake | 3 | 269 | 266 | 0.37% | 723 | 0 | City |
| Pleasant | 4 | 216 | 206 | 1.41% | 6 | 35 | Township |
| Collins | 5 | 200 | 193 | 0% | 6 | 35 | Township |
| Lake | 6 | 188 | 180 | 0% | 5 | 34 | Township |
| Fordham | 7 | 151 | 147 | 0.67% | 4 | 36 | Township |
| Day | 8 | 111 | 105 | 0.91% | 3 | 35 | Township |
| Clark | 9 | 94 | 94 | 0% | 3 | 28 | Township |
| Cottonwood | 10 | 88 | 82 | 1.15% | 3 | 35 | Township |
| Lincoln | 11 | 88 | 85 | 0% | 3 | 35 | Township |
| Washington | 12 | 88 | 84 | 0% | 2 | 36 | Township |
| Elrod | 13 | 86 | 82 | 0% | 2 | 36 | Township |
| Rosedale | 14 | 79 | 73 | 1.28% | 2 | 36 | Township |
| Bradley | 15 | 67 | 63 | 1.52% | 273 | 0 | Town |
| Darlington | 16 | 61 | 58 | 0% | 2 | 36 | Township |
| Garfield | 17 | 61 | 54 | 3.39% | 2 | 36 | Township |
| Woodland | 18 | 60 | 57 | 0% | 2 | 35 | Township |
| Thorp | 19 | 57 | 50 | 3.64% | 2 | 35 | Township |
| Raymond | 20 | 57 | 53 | 1.79% | 218 | 0 | Town |
| Vienna | 21 | 54 | 50 | 1.89% | 64 | 1 | Town |
| Foxton | 22 | 53 | 46 | 3.92% | 1 | 36 | Township |
| Richland | 23 | 53 | 50 | 0% | 1 | 36 | Township |
| Maydell | 24 | 50 | 43 | 4.17% | 1 | 35 | Township |
| Raymond | 25 | 48 | 43 | 2.13% | 1 | 36 | Township |
| Willow Lake | 26 | 44 | 45 | -2.22% | 1 | 35 | Township |
| Hague | 27 | 43 | 42 | 0% | 1 | 36 | Township |
| Warren | 28 | 42 | 41 | 0% | 1 | 35 | Township |
| Naples | 29 | 41 | 40 | 0% | 295 | 0 | Town |
| Merton | 30 | 39 | 37 | 0% | 1 | 36 | Township |
| Blaine | 31 | 38 | 36 | 0% | 1 | 34 | Township |
| Garden City | 32 | 37 | 34 | 2.78% | 94 | 0 | Town |
| Logan | 33 | 36 | 35 | 0% | 1 | 36 | Township |
| Spring Valley | 34 | 35 | 33 | 0% | 1 | 35 | Township |
| Ash | 35 | 23 | 23 | 0% | 1 | 36 | Township |
| Clark | 36 | 22 | 19 | 4.76% | 1 | 34 | Township |
| Clark | 37 | 8 | 8 | 0% | 0.00 | 36 | Township |
Clark is the largest city in Clark County, with a population of 1,175.
Clark is the smallest city in Clark County, with a population of 8.
There are 37 cities in Clark County, South Dakota.