
Hermosa
- County:
- Custer County
- County Seat:
- No
- Area (mi²):
- 0.784
- State:
- South Dakota
Hermosa is a town located in Custer County, South Dakota. Hermosa has a 2025 population of 369. Hermosa is currently declining at a rate of -0.54% annually and its population has decreased by -2.38% since the most recent census, which recorded a population of 378 in 2020.
The average household income in Hermosa is $74,950 with a poverty rate of 14.86%. The median age in Hermosa is 45.4 years: 51.3 years for males, and 37.5 years for females.