5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Custer | 1 | 1,773 | 1,940 | -1.55% | 715 | 2 | City |
| Hermosa | 2 | 378 | 387 | -0.26% | 437 | 1 | Town |
| Buffalo Gap | 3 | 166 | 129 | 3.75% | 542 | 0 | Town |
| Pringle | 4 | 104 | 112 | -0.95% | 430 | 0 | Town |
| Fairburn | 5 | 73 | 57 | 4.29% | 223 | 0 | Town |
Custer is the largest city in Custer County, with a population of 1,773.
Fairburn is the smallest city in Custer County, with a population of 73.
There are 5 cities in Custer County, South Dakota.