| | Premont, TX | Riviera, TX | United States |
| Population | 2,591 | 675 | 329,725,481 |
| Female Population | 43.3% | 48.9% | 50.5% |
| Male Population | 56.7% | 51.1% | 49.5% |
| Median Age | 34 | 38.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,656 | 669 | 309,327,143 |
| Population - 2000 | 2,772 | 575 | 285,036,114 |
| Population - 1990 | 2,914 | 505 | 251,960,433 |
| Pop. 2000 to Now | -8.9% | 21.4% | 15.6% |
| Pop. 1990 to Now | -13.4% | 38.2% | 30.8% |
| space4 | | | |
| Population Density | 1,515.2 | 183.0 | 93.4 |
| Land Area | 1.7 | 3.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Premont, TX | Riviera, TX | United States |
| Age 0 to 4 | 7.4% | 4.7% | 5.9% |
| Age 5 to 9 | 4.7% | 1.5% | 6.1% |
| Age 10 to 14 | 2.7% | 6.5% | 6.6% |
| Age 15 to 17 | 3.4% | 15.3% | 3.9% |
| Age 18 to 20 | 5.6% | 5.9% | 4.0% |
| Age 21 to 24 | 9.7% | 4.9% | 5.2% |
| Age 25 to 34 | 19.6% | 7.7% | 13.8% |
| Age 35 to 44 | 5.7% | 9.2% | 12.9% |
| Age 45 to 54 | 13.1% | 6.8% | 12.6% |
| Age 55 to 59 | 6.9% | 13.9% | 6.7% |
| Age 60 to 64 | 4.5% | 6.2% | 6.3% |
| Age 65 to 74 | 8.2% | 9.2% | 9.6% |
| Age 75 to 84 | 2.7% | 8.1% | 4.5% |
| Age 85 and over | 5.9% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Premont, TX | Riviera, TX | United States |
| White | 5.3% | 19.0% | 59.4% |
| Black | 0.3% | 0.0% | 12.2% |
| Asian | 0.3% | 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 | 0.0% | 0.0% | 3.2% |
| Hispanic | 94.2% | 81.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Premont, TX | Riviera, TX | United States |
| Married Population | 47.5% | 38.7% | 49.8% |
| Currently Married | 45.6% | 36.5% | 48.0% |
| Married but Separated | 1.9% | 2.2% | 1.8% |
| Single Population | 52.5% | 61.3% | 50.2% |
| Never Married | 28.9% | 42.3% | 33.8% |
| Divorced | 14.5% | 7.0% | 10.8% |
| Widowed | 9.1% | 12.1% | 5.6% |
| space5 | | | |
| Household Size | 2.69 | 2.69 | 2.60 |
| Households | 953 | 251 | 124,010,992 |
| Family Households | 710 | 176 | 80,755,759 |
| Married couple, w/children | 38.5% | 33.0% | 30.5% |
| Married couple, no children | 30.0% | 25.0% | 42.9% |
| Non Family Households | 243 | 75 | 43,255,233 |
| Single householder, w/children | 15.5% | 14.2% | 15.8% |
| Single householder, no children | 16.1% | 27.8% | 10.8% |