| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clark | 1 | 1,189 | 1,149 | 0.51% | 879 | 1 | City |
| Willow Lake | 2 | 272 | 266 | 0.37% | 731 | 0 | City |
| Bradley | 3 | 69 | 66 | 0% | 282 | 0 | Town |
| Raymond | 4 | 57 | 54 | 0% | 218 | 0 | Town |
| Vienna | 5 | 54 | 50 | 0% | 64 | 1 | Town |
| Naples | 6 | 41 | 40 | 0% | 295 | 0 | Town |
| Garden City | 7 | 36 | 34 | 0% | 91 | 0 | Town |
Clark is the largest city in Clark County, with a population of 1,189.
Garden City is the smallest city in Clark County, with a population of 36.
There are 7 cities in Clark County, South Dakota.