| | Sonora, TX | Brenham, TX | United States |
| Population | 2,955 | 17,385 | 329,725,481 |
| Female Population | 49.3% | 54.6% | 50.5% |
| Male Population | 50.7% | 45.4% | 49.5% |
| Median Age | 32.7 | 35 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,978 | 15,835 | 309,327,143 |
| Population - 2000 | 2,924 | 13,507 | 285,036,114 |
| Population - 1990 | 2,751 | 11,952 | 251,960,433 |
| Pop. 2000 to Now | -5.5% | 31.3% | 15.6% |
| Pop. 1990 to Now | 0.5% | 48.4% | 30.8% |
| space4 | | | |
| Population Density | 1,332.3 | 1,342.0 | 93.4 |
| Land Area | 2.2 | 13.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Sonora, TX | Brenham, TX | United States |
| Age 0 to 4 | 11.3% | 5.4% | 5.9% |
| Age 5 to 9 | 11.3% | 6.8% | 6.1% |
| Age 10 to 14 | 8.0% | 6.6% | 6.6% |
| Age 15 to 17 | 2.4% | 4.0% | 3.9% |
| Age 18 to 20 | 4.0% | 10.9% | 4.0% |
| Age 21 to 24 | 3.0% | 6.7% | 5.2% |
| Age 25 to 34 | 11.7% | 9.6% | 13.8% |
| Age 35 to 44 | 16.4% | 11.1% | 12.9% |
| Age 45 to 54 | 7.5% | 9.2% | 12.6% |
| Age 55 to 59 | 4.9% | 5.4% | 6.7% |
| Age 60 to 64 | 3.7% | 5.9% | 6.3% |
| Age 65 to 74 | 7.9% | 8.0% | 9.6% |
| Age 75 to 84 | 5.3% | 7.2% | 4.5% |
| Age 85 and over | 2.6% | 3.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Sonora, TX | Brenham, TX | United States |
| White | 25.3% | 47.7% | 59.4% |
| Black | 0.1% | 22.6% | 12.2% |
| Asian | 0.0% | 1.7% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 0.1% | 2.6% | 3.2% |
| Hispanic | 73.9% | 25.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Sonora, TX | Brenham, TX | United States |
| Married Population | 62.8% | 43.5% | 49.8% |
| Currently Married | 60.2% | 42.4% | 48.0% |
| Married but Separated | 2.5% | 1.1% | 1.8% |
| Single Population | 37.2% | 56.5% | 50.2% |
| Never Married | 20.0% | 37.8% | 33.8% |
| Divorced | 13.6% | 12.8% | 10.8% |
| Widowed | 3.7% | 5.9% | 5.6% |
| space5 | | | |
| Household Size | 3.14 | 2.36 | 2.60 |
| Households | 935 | 6,476 | 124,010,992 |
| Family Households | 737 | 3,755 | 80,755,759 |
| Married couple, w/children | 37.7% | 31.4% | 30.5% |
| Married couple, no children | 33.9% | 40.4% | 42.9% |
| Non Family Households | 198 | 2,721 | 43,255,233 |
| Single householder, w/children | 16.0% | 19.0% | 15.8% |
| Single householder, no children | 12.3% | 9.2% | 10.8% |