| Place Name | Hermosa |
| Place Type | Town |
| ZIP Code(s) | 57744 |
| GEOID | 4628300 |
| County | Custer County |
| Area Code(s) | 605 |
| Timezone | Mountain Standard Time (MST) |
| Population (2021) | 397 |
| Population Growth Rate (2010-19) | -4.02% |
| Majority Ethnicity | White 71.6% |
| US Congressional District(s) | South Dakota At-Large |
| State House Districts | 30 |
| State Senate Districts | 30 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 71.6% |
| African American | 0% |
| Hispanic | 6.17% |
| Asian | 0.99% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 21.23% |