8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wanblee | 1 | 645 | 835 | -0.77% | 320 | 2 | CDP |
| Kadoka | 2 | 526 | 543 | -0.75% | 230 | 2 | City |
| Corn Creek | 3 | 202 | 125 | 3.06% | 100 | 2 | CDP |
| Interior | 4 | 64 | 67 | -1.54% | 48 | 1 | Town |
| Belvidere | 5 | 43 | 43 | 0% | 57 | 1 | Town |
| Interior | 6 | 43 | 44 | 0% | 0.00 | 101 | Township |
| Weta | 7 | 16 | 18 | -5.88% | 0.00 | 50 | Township |
| Grandview II | 8 | 5 | 5 | 0% | 0.00 | 21 | Township |
Wanblee is the largest city in Jackson County, with a population of 645.
Grandview II is the smallest city in Jackson County, with a population of 5.
There are 8 cities in Jackson County, South Dakota.