6 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Buffalo | 1 | 362 | 347 | 0.84% | 653 | 0.55 | Town |
| Buffalo township | 2 | 198 | 219 | -2.94% | 6 | 34.52 | Township |
| Buffalo township | 3 | 145 | 131 | 2.11% | 5 | 28.54 | Township |
| Camp Crook | 4 | 66 | 60 | 1.54% | 475 | 0.14 | Town |
| Buffalo township | 5 | 46 | 50 | -2.13% | 1 | 35.78 | Township |
| Buffalo township | 6 | 32 | 38 | -3.03% | 1 | 35.75 | Township |
Buffalo is the largest city in Harding County, with a population of 362.
Buffalo township is the smallest city in Harding County.
There are 6 cities in Harding County, South Dakota.