| | Fort Clark Springs, TX | Uvalde, TX | United States |
| Population | 1,338 | 15,374 | 329,725,481 |
| Female Population | 36.4% | 50.8% | 50.5% |
| Male Population | 63.6% | 49.2% | 49.5% |
| Median Age | 56.4 | 32.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,104 | 15,760 | 309,327,143 |
| Population - 2000 | 962 | 14,929 | 285,036,114 |
| Population - 1990 | 909 | 14,729 | 251,960,433 |
| Pop. 2000 to Now | -9.5% | 7.0% | 15.6% |
| Pop. 1990 to Now | -4.2% | 8.5% | 30.8% |
| space4 | | | |
| Population Density | 450.2 | 2,006.0 | 93.4 |
| Land Area | 3.0 | 7.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fort Clark Springs, TX | Uvalde, TX | United States |
| Age 0 to 4 | 0.0% | 7.8% | 5.9% |
| Age 5 to 9 | 0.0% | 5.8% | 6.1% |
| Age 10 to 14 | 0.0% | 10.2% | 6.6% |
| Age 15 to 17 | 8.7% | 4.9% | 3.9% |
| Age 18 to 20 | 0.0% | 3.8% | 4.0% |
| Age 21 to 24 | 0.0% | 6.8% | 5.2% |
| Age 25 to 34 | 17.6% | 13.7% | 13.8% |
| Age 35 to 44 | 5.2% | 13.3% | 12.9% |
| Age 45 to 54 | 8.8% | 8.8% | 12.6% |
| Age 55 to 59 | 23.8% | 4.7% | 6.7% |
| Age 60 to 64 | 1.0% | 5.7% | 6.3% |
| Age 65 to 74 | 8.3% | 7.9% | 9.6% |
| Age 75 to 84 | 24.4% | 4.7% | 4.5% |
| Age 85 and over | 2.2% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fort Clark Springs, TX | Uvalde, TX | United States |
| White | 53.2% | 14.5% | 59.4% |
| Black | 0.0% | 0.5% | 12.2% |
| Asian | 0.0% | 1.7% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.0% | 1.2% | 3.2% |
| Hispanic | 46.8% | 81.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fort Clark Springs, TX | Uvalde, TX | United States |
| Married Population | 44.5% | 46.5% | 49.8% |
| Currently Married | 43.3% | 42.4% | 48.0% |
| Married but Separated | 1.2% | 4.1% | 1.8% |
| Single Population | 55.5% | 53.5% | 50.2% |
| Never Married | 31.5% | 34.6% | 33.8% |
| Divorced | 17.0% | 13.5% | 10.8% |
| Widowed | 6.9% | 5.3% | 5.6% |
| space5 | | | |
| Household Size | 2.36 | 2.90 | 2.60 |
| Households | 567 | 5,143 | 124,010,992 |
| Family Households | 291 | 3,434 | 80,755,759 |
| Married couple, w/children | 0.0% | 31.9% | 30.5% |
| Married couple, no children | 94.5% | 29.6% | 42.9% |
| Non Family Households | 276 | 1,709 | 43,255,233 |
| Single householder, w/children | 5.5% | 25.3% | 15.8% |
| Single householder, no children | 0.0% | 13.2% | 10.8% |