| Statistic | Sierraville | California | National |
| Population | 172 | 40,994,941 | 336,919,644 |
| Population density (sq mi) | 34 | 263 | 91 |
| Median age | 45.7 | 36.0 | 37.7 |
| Male/Female ratio | 1.1:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 46% | 52% | 55% |
| Families w/ Kids under 18 | 49% | 46% | 43% |
| Speak English | 73% | 56% | 79% |
| Speak Spanish | 27% | 29% | 13% |

| Race | Sierraville | California | National |
| White | 42.17% | 61.26% | 73.35% |
| Black | 0.60% | 5.85% | 12.63% |
| Asian | 0.00% | 13.85% | 5.22% |
| American Indian | 0.00% | 0.74% | 0.82% |
| Native Hawaiian | 0.00% | 0.39% | 0.18% |
| Mixed race | 4.22% | 4.62% | 3.06% |
| Other race | 53.01% | 13.28% | 4.75% |