| | Belton, TX | Bastrop, TX | United States |
| Population | 22,866 | 9,531 | 329,725,481 |
| Female Population | 55.5% | 51.3% | 50.5% |
| Male Population | 44.5% | 48.7% | 49.5% |
| Median Age | 26.4 | 40.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 18,474 | 7,368 | 309,327,143 |
| Population - 2000 | 14,623 | 5,340 | 285,036,114 |
| Population - 1990 | 12,476 | 4,044 | 251,960,433 |
| Pop. 2000 to Now | 58.6% | 82.5% | 15.6% |
| Pop. 1990 to Now | 85.9% | 140.9% | 30.8% |
| space4 | | | |
| Population Density | 1,131.1 | 877.0 | 93.4 |
| Land Area | 20.2 | 10.9 | 3,531,905.4 |
| Water Area | 0.9 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Belton, TX | Bastrop, TX | United States |
| Age 0 to 4 | 7.3% | 8.4% | 5.9% |
| Age 5 to 9 | 8.9% | 2.1% | 6.1% |
| Age 10 to 14 | 8.2% | 5.6% | 6.6% |
| Age 15 to 17 | 3.9% | 3.5% | 3.9% |
| Age 18 to 20 | 9.1% | 4.5% | 4.0% |
| Age 21 to 24 | 9.2% | 7.7% | 5.2% |
| Age 25 to 34 | 15.9% | 13.0% | 13.8% |
| Age 35 to 44 | 10.0% | 13.4% | 12.9% |
| Age 45 to 54 | 8.5% | 15.5% | 12.6% |
| Age 55 to 59 | 4.0% | 4.8% | 6.7% |
| Age 60 to 64 | 4.5% | 4.7% | 6.3% |
| Age 65 to 74 | 5.9% | 8.7% | 9.6% |
| Age 75 to 84 | 3.1% | 5.8% | 4.5% |
| Age 85 and over | 1.5% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Belton, TX | Bastrop, TX | United States |
| White | 56.0% | 56.3% | 59.4% |
| Black | 7.8% | 3.8% | 12.2% |
| Asian | 1.3% | 3.1% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 5.5% | 1.1% | 3.2% |
| Hispanic | 29.2% | 35.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Belton, TX | Bastrop, TX | United States |
| Married Population | 37.3% | 54.0% | 49.8% |
| Currently Married | 33.3% | 51.3% | 48.0% |
| Married but Separated | 4.0% | 2.7% | 1.8% |
| Single Population | 62.7% | 46.0% | 50.2% |
| Never Married | 43.0% | 25.9% | 33.8% |
| Divorced | 11.7% | 13.5% | 10.8% |
| Widowed | 7.9% | 6.6% | 5.6% |
| space5 | | | |
| Household Size | 2.66 | 2.43 | 2.60 |
| Households | 7,652 | 3,687 | 124,010,992 |
| Family Households | 4,234 | 2,296 | 80,755,759 |
| Married couple, w/children | 33.2% | 44.6% | 30.5% |
| Married couple, no children | 28.4% | 36.8% | 42.9% |
| Non Family Households | 3,418 | 1,391 | 43,255,233 |
| Single householder, w/children | 24.7% | 4.8% | 15.8% |
| Single householder, no children | 13.8% | 13.7% | 10.8% |