| | Jefferson, TX | Belton, TX | United States |
| Population | 2,242 | 22,866 | 329,725,481 |
| Female Population | 58.2% | 55.5% | 50.5% |
| Male Population | 41.8% | 44.5% | 49.5% |
| Median Age | 41.5 | 26.4 | 38.4 |
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| Population - 2010 | 2,085 | 18,474 | 309,327,143 |
| Population - 2000 | 2,024 | 14,623 | 285,036,114 |
| Population - 1990 | 2,199 | 12,476 | 251,960,433 |
| Pop. 2000 to Now | -4.9% | 58.6% | 15.6% |
| Pop. 1990 to Now | -12.5% | 85.9% | 30.8% |
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| Population Density | 504.1 | 1,131.1 | 93.4 |
| Land Area | 4.4 | 20.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.9 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Jefferson, TX | Belton, TX | United States |
| Age 0 to 4 | 7.3% | 7.3% | 5.9% |
| Age 5 to 9 | 7.7% | 8.9% | 6.1% |
| Age 10 to 14 | 6.7% | 8.2% | 6.6% |
| Age 15 to 17 | 4.0% | 3.9% | 3.9% |
| Age 18 to 20 | 3.9% | 9.1% | 4.0% |
| Age 21 to 24 | 4.5% | 9.2% | 5.2% |
| Age 25 to 34 | 7.3% | 15.9% | 13.8% |
| Age 35 to 44 | 16.1% | 10.0% | 12.9% |
| Age 45 to 54 | 7.9% | 8.5% | 12.6% |
| Age 55 to 59 | 7.7% | 4.0% | 6.7% |
| Age 60 to 64 | 3.9% | 4.5% | 6.3% |
| Age 65 to 74 | 13.9% | 5.9% | 9.6% |
| Age 75 to 84 | 4.6% | 3.1% | 4.5% |
| Age 85 and over | 4.6% | 1.5% | 1.9% |
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| Race | | | |
| | Jefferson, TX | Belton, TX | United States |
| White | 36.1% | 56.0% | 59.4% |
| Black | 54.3% | 7.8% | 12.2% |
| Asian | 1.1% | 1.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 3.3% | 5.5% | 3.2% |
| Hispanic | 5.2% | 29.2% | 18.4% |
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| Marriage & Family | | | |
| | Jefferson, TX | Belton, TX | United States |
| Married Population | 38.2% | 37.3% | 49.8% |
| Currently Married | 38.2% | 33.3% | 48.0% |
| Married but Separated | 0.0% | 4.0% | 1.8% |
| Single Population | 61.8% | 62.7% | 50.2% |
| Never Married | 37.7% | 43.0% | 33.8% |
| Divorced | 11.0% | 11.7% | 10.8% |
| Widowed | 13.2% | 7.9% | 5.6% |
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| Household Size | 2.26 | 2.66 | 2.60 |
| Households | 951 | 7,652 | 124,010,992 |
| Family Households | 530 | 4,234 | 80,755,759 |
| Married couple, w/children | 23.0% | 33.2% | 30.5% |
| Married couple, no children | 37.0% | 28.4% | 42.9% |
| Non Family Households | 421 | 3,418 | 43,255,233 |
| Single householder, w/children | 34.3% | 24.7% | 15.8% |
| Single householder, no children | 5.7% | 13.8% | 10.8% |