8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Wanblee | 1 | 645 | 835 | -0.77% | 320 | 2.01 | CDP |
| Kadoka | 2 | 535 | 544 | -0.37% | 234 | 2.29 | City |
| Corn Creek | 3 | 202 | 125 | 3.06% | 100 | 2.03 | CDP |
| Interior | 4 | 65 | 67 | 0% | 49 | 1.34 | Town |
| Belvidere | 5 | 41 | 43 | 0% | 54 | 0.76 | Town |
| Interior township | 6 | 40 | 43 | -2.44% | 0.00 | 100.85 | Township |
| Weta township | 7 | 19 | 19 | 0% | 0.00 | 49.87 | Township |
| Grandview II township | 8 | 6 | 6 | 0% | 0.00 | 20.93 | Township |
Wanblee is the largest city in Jackson County, with a population of 645.
Grandview II township is the smallest city in Jackson County.
There are 8 cities in Jackson County, South Dakota.