7 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clark | 1 | 1,175 | 1,151 | 0.34% | 868 | 1 | City |
| Willow Lake | 2 | 269 | 266 | 0.37% | 723 | 0 | City |
| Bradley | 3 | 67 | 63 | 1.52% | 273 | 0 | Town |
| Raymond | 4 | 57 | 53 | 1.79% | 218 | 0 | Town |
| Vienna | 5 | 54 | 50 | 1.89% | 64 | 1 | Town |
| Naples | 6 | 41 | 40 | 0% | 295 | 0 | Town |
| Garden City | 7 | 37 | 34 | 2.78% | 94 | 0 | Town |
Clark is the largest city in Clark County, with a population of 1,175.
Garden City is the smallest city in Clark County, with a population of 37.
There are 7 cities in Clark County, South Dakota.