| Place Name | South Mountain |
| Place Type | Town |
| ZIP Code(s) | 76528 76561 |
| County | Coryell County |
| Area Code(s) | 254 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 343 |
| Population Growth Rate (2010-19) | 7.03% |
| Majority Ethnicity | White 85.2% |
| Metro/Micro Stats Area | Killeen-Temple, TX |
| US Congressional District(s) | Texas 25th |
| State House Districts | 59 |
| State Senate Districts | 24 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 85.2% |
| African American | 0% |
| Hispanic | 1.9% |
| Asian | 0.21% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 12.68% |