| | Somerville, TX | Bastrop, TX | United States |
| Population | 1,249 | 9,531 | 329,725,481 |
| Female Population | 55.6% | 51.3% | 50.5% |
| Male Population | 44.4% | 48.7% | 49.5% |
| Median Age | 40.6 | 40.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,379 | 7,368 | 309,327,143 |
| Population - 2000 | 1,704 | 5,340 | 285,036,114 |
| Population - 1990 | 1,542 | 4,044 | 251,960,433 |
| Pop. 2000 to Now | -15.3% | 82.5% | 15.6% |
| Pop. 1990 to Now | -6.4% | 140.9% | 30.8% |
| space4 | | | |
| Population Density | 419.8 | 877.0 | 93.4 |
| Land Area | 3.0 | 10.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Somerville, TX | Bastrop, TX | United States |
| Age 0 to 4 | 4.2% | 8.4% | 5.9% |
| Age 5 to 9 | 6.6% | 2.1% | 6.1% |
| Age 10 to 14 | 8.1% | 5.6% | 6.6% |
| Age 15 to 17 | 3.7% | 3.5% | 3.9% |
| Age 18 to 20 | 1.9% | 4.5% | 4.0% |
| Age 21 to 24 | 9.9% | 7.7% | 5.2% |
| Age 25 to 34 | 5.4% | 13.0% | 13.8% |
| Age 35 to 44 | 16.5% | 13.4% | 12.9% |
| Age 45 to 54 | 9.7% | 15.5% | 12.6% |
| Age 55 to 59 | 7.1% | 4.8% | 6.7% |
| Age 60 to 64 | 5.2% | 4.7% | 6.3% |
| Age 65 to 74 | 12.3% | 8.7% | 9.6% |
| Age 75 to 84 | 7.8% | 5.8% | 4.5% |
| Age 85 and over | 1.7% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Somerville, TX | Bastrop, TX | United States |
| White | 37.8% | 56.3% | 59.4% |
| Black | 28.8% | 3.8% | 12.2% |
| Asian | 0.0% | 3.1% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.0% | 1.1% | 3.2% |
| Hispanic | 29.4% | 35.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Somerville, TX | Bastrop, TX | United States |
| Married Population | 54.1% | 54.0% | 49.8% |
| Currently Married | 51.1% | 51.3% | 48.0% |
| Married but Separated | 3.0% | 2.7% | 1.8% |
| Single Population | 45.9% | 46.0% | 50.2% |
| Never Married | 29.8% | 25.9% | 33.8% |
| Divorced | 7.2% | 13.5% | 10.8% |
| Widowed | 8.9% | 6.6% | 5.6% |
| space5 | | | |
| Household Size | 2.46 | 2.43 | 2.60 |
| Households | 507 | 3,687 | 124,010,992 |
| Family Households | 300 | 2,296 | 80,755,759 |
| Married couple, w/children | 37.3% | 44.6% | 30.5% |
| Married couple, no children | 46.0% | 36.8% | 42.9% |
| Non Family Households | 207 | 1,391 | 43,255,233 |
| Single householder, w/children | 9.7% | 4.8% | 15.8% |
| Single householder, no children | 7.0% | 13.7% | 10.8% |