| Statistic | South Mountain | Texas | National |
| Population | 441 | 28,995,881 | 328,239,523 |
| Population density (sq mi) | 273 | 113 | 91 |
| Median age | 49.9 | 34.2 | 37.7 |
| Male/Female ratio | 0.9:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 67% | 56% | 55% |
| Families w/ Kids under 18 | 23% | 48% | 43% |
| Speak English | 86% | 65% | 79% |
| Speak Spanish | 14% | 30% | 13% |
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| Race | South Mountain | Texas | National |
| White | 97.73% | 74.84% | 73.35% |
| Black | 0.00% | 11.95% | 12.63% |
| Asian | 0.23% | 4.36% | 5.22% |
| American Indian | 1.36% | 0.48% | 0.82% |
| Native Hawaiian | 0.00% | 0.08% | 0.18% |
| Mixed race | 0.00% | 2.50% | 3.06% |
| Other race | 0.68% | 5.79% | 4.75% |
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