37 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clark | 1 | 1,171 | 1,151 | 0.34% | 865 | 1 | City |
| Mount Pleasant | 2 | 271 | 257 | 0.37% | 8 | 36 | Township |
| Willow Lake | 3 | 268 | 266 | 0% | 720 | 0 | City |
| Pleasant | 4 | 213 | 206 | 1.43% | 6 | 35 | Township |
| Collins | 5 | 200 | 193 | 0% | 6 | 35 | Township |
| Lake | 6 | 188 | 180 | 0% | 5 | 34 | Township |
| Fordham | 7 | 150 | 147 | 0.67% | 4 | 36 | Township |
| Day | 8 | 110 | 105 | 0.92% | 3 | 35 | Township |
| Clark | 9 | 94 | 94 | 0% | 3 | 28 | Township |
| Lincoln | 10 | 88 | 85 | 0% | 3 | 35 | Township |
| Washington | 11 | 88 | 84 | 0% | 2 | 36 | Township |
| Cottonwood | 12 | 87 | 82 | 1.16% | 2 | 35 | Township |
| Elrod | 13 | 86 | 82 | 0% | 2 | 36 | Township |
| Rosedale | 14 | 78 | 73 | 1.3% | 2 | 36 | Township |
| Bradley | 15 | 66 | 63 | 0% | 269 | 0 | Town |
| Darlington | 16 | 61 | 58 | 0% | 2 | 36 | Township |
| Woodland | 17 | 60 | 57 | 0% | 2 | 35 | Township |
| Garfield | 18 | 59 | 54 | 3.51% | 2 | 36 | Township |
| Raymond | 19 | 56 | 53 | 0% | 214 | 0 | Town |
| Thorp | 20 | 55 | 50 | 3.77% | 2 | 35 | Township |
| Richland | 21 | 53 | 50 | 0% | 1 | 36 | Township |
| Vienna | 22 | 53 | 50 | 0% | 63 | 1 | Town |
| Foxton | 23 | 51 | 46 | 4.08% | 1 | 36 | Township |
| Maydell | 24 | 48 | 43 | 4.35% | 1 | 35 | Township |
| Raymond | 25 | 47 | 43 | 2.17% | 1 | 36 | Township |
| Willow Lake | 26 | 45 | 45 | -2.17% | 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 |
| Logan | 32 | 36 | 35 | 0% | 1 | 36 | Township |
| Garden City | 33 | 36 | 34 | 0% | 91 | 0 | Town |
| Spring Valley | 34 | 35 | 33 | 0% | 1 | 35 | Township |
| Ash | 35 | 23 | 23 | 0% | 1 | 36 | Township |
| Clark | 36 | 21 | 19 | 5% | 1 | 34 | Township |
| Clark | 37 | 8 | 8 | 0% | 0.00 | 36 | Township |
Clark is the largest city in Clark County, with a population of 1,171.
Clark is the smallest city in Clark County, with a population of 8.
There are 37 cities in Clark County, South Dakota.