| | Huntsville, TX | Brazoria, TX | United States |
| Population | 45,446 | 2,894 | 329,725,481 |
| Female Population | 42.0% | 56.9% | 50.5% |
| Male Population | 58.0% | 43.1% | 49.5% |
| Median Age | 31.3 | 39.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 38,725 | 3,038 | 309,327,143 |
| Population - 2000 | 35,078 | 2,787 | 285,036,114 |
| Population - 1990 | 27,925 | 2,717 | 251,960,433 |
| Pop. 2000 to Now | 18.0% | 9.9% | 15.6% |
| Pop. 1990 to Now | 48.2% | 12.7% | 30.8% |
| space4 | | | |
| Population Density | 1,267.6 | 1,070.3 | 93.4 |
| Land Area | 35.9 | 2.7 | 3,531,905.4 |
| Water Area | 0.5 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Huntsville, TX | Brazoria, TX | United States |
| Age 0 to 4 | 3.5% | 7.0% | 5.9% |
| Age 5 to 9 | 3.6% | 6.4% | 6.1% |
| Age 10 to 14 | 3.6% | 6.2% | 6.6% |
| Age 15 to 17 | 1.9% | 6.4% | 3.9% |
| Age 18 to 20 | 13.4% | 4.4% | 4.0% |
| Age 21 to 24 | 14.0% | 0.3% | 5.2% |
| Age 25 to 34 | 15.1% | 14.3% | 13.8% |
| Age 35 to 44 | 12.2% | 10.3% | 12.9% |
| Age 45 to 54 | 11.5% | 16.8% | 12.6% |
| Age 55 to 59 | 5.0% | 7.9% | 6.7% |
| Age 60 to 64 | 5.1% | 4.6% | 6.3% |
| Age 65 to 74 | 6.7% | 11.3% | 9.6% |
| Age 75 to 84 | 2.9% | 3.0% | 4.5% |
| Age 85 and over | 1.6% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Huntsville, TX | Brazoria, TX | United States |
| White | 49.2% | 62.6% | 59.4% |
| Black | 26.2% | 7.8% | 12.2% |
| Asian | 1.6% | 0.3% | 5.6% |
| Native American | 0.3% | 0.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.5% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 1.5% | 1.4% | 3.2% |
| Hispanic | 20.8% | 26.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Huntsville, TX | Brazoria, TX | United States |
| Married Population | 28.4% | 52.3% | 49.8% |
| Currently Married | 26.7% | 49.1% | 48.0% |
| Married but Separated | 1.7% | 3.2% | 1.8% |
| Single Population | 71.6% | 47.7% | 50.2% |
| Never Married | 51.8% | 29.7% | 33.8% |
| Divorced | 14.9% | 11.0% | 10.8% |
| Widowed | 4.9% | 7.0% | 5.6% |
| space5 | | | |
| Household Size | 2.39 | 2.63 | 2.60 |
| Households | 14,092 | 1,099 | 124,010,992 |
| Family Households | 6,517 | 780 | 80,755,759 |
| Married couple, w/children | 28.2% | 20.6% | 30.5% |
| Married couple, no children | 32.4% | 45.5% | 42.9% |
| Non Family Households | 7,575 | 319 | 43,255,233 |
| Single householder, w/children | 22.1% | 23.6% | 15.8% |
| Single householder, no children | 17.3% | 10.3% | 10.8% |