| Place Name | Round Mountain |
| Place Type | Town |
| ZIP Code(s) | 78663 |
| County | Blanco County |
| Area Code(s) | 830 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 363 |
| Population Growth Rate (2010-19) | -44.20% |
| Majority Ethnicity | White 88.62% |
| US Congressional District(s) | Texas 21st |
| State House Districts | 45 |
| State Senate Districts | 24 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 88.62% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 11.38% |