| | Sinton, TX | Damon, TX | United States |
| Population | 5,557 | 154 | 329,725,481 |
| Female Population | 53.8% | 39.0% | 50.5% |
| Male Population | 46.2% | 61.0% | 49.5% |
| Median Age | 30.2 | 50.2 | 38.4 |
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| Population - 2010 | 5,621 | 319 | 309,327,143 |
| Population - 2000 | 5,676 | 535 | 285,036,114 |
| Population - 1990 | 5,549 | 391 | 251,960,433 |
| Pop. 2000 to Now | -7.0% | -23.7% | 15.6% |
| Pop. 1990 to Now | -4.8% | 4.4% | 30.8% |
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| Population Density | 1,876.1 | 110.5 | 93.4 |
| Land Area | 3.0 | 1.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Sinton, TX | Damon, TX | United States |
| Age 0 to 4 | 12.3% | 0.0% | 5.9% |
| Age 5 to 9 | 4.7% | 6.5% | 6.1% |
| Age 10 to 14 | 6.3% | 0.0% | 6.6% |
| Age 15 to 17 | 1.7% | 18.8% | 3.9% |
| Age 18 to 20 | 4.3% | 0.0% | 4.0% |
| Age 21 to 24 | 9.4% | 7.1% | 5.2% |
| Age 25 to 34 | 15.8% | 0.0% | 13.8% |
| Age 35 to 44 | 8.8% | 16.2% | 12.9% |
| Age 45 to 54 | 10.8% | 24.7% | 12.6% |
| Age 55 to 59 | 7.8% | 7.8% | 6.7% |
| Age 60 to 64 | 6.0% | 0.0% | 6.3% |
| Age 65 to 74 | 5.6% | 18.8% | 9.6% |
| Age 75 to 84 | 5.1% | 0.0% | 4.5% |
| Age 85 and over | 1.3% | 0.0% | 1.9% |
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| Race | | | |
| | Sinton, TX | Damon, TX | United States |
| White | 20.0% | 70.1% | 59.4% |
| Black | 1.6% | 0.0% | 12.2% |
| Asian | 0.5% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 0.0% | 3.2% |
| Hispanic | 76.6% | 29.9% | 18.4% |
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| Marriage & Family | | | |
| | Sinton, TX | Damon, TX | United States |
| Married Population | 36.3% | 31.3% | 49.8% |
| Currently Married | 32.1% | 31.3% | 48.0% |
| Married but Separated | 4.2% | 0.0% | 1.8% |
| Single Population | 63.7% | 68.8% | 50.2% |
| Never Married | 43.7% | 45.1% | 33.8% |
| Divorced | 11.4% | 23.6% | 10.8% |
| Widowed | 8.6% | 0.0% | 5.6% |
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| Household Size | 2.76 | 1.90 | 2.60 |
| Households | 1,913 | 81 | 124,010,992 |
| Family Households | 1,330 | 33 | 80,755,759 |
| Married couple, w/children | 14.3% | 39.4% | 30.5% |
| Married couple, no children | 32.0% | 27.3% | 42.9% |
| Non Family Households | 583 | 48 | 43,255,233 |
| Single householder, w/children | 37.1% | 33.3% | 15.8% |
| Single householder, no children | 16.7% | 0.0% | 10.8% |