| | Seminole, TX | Sterling, IL | United States |
| Population | 6,913 | 14,919 | 329,725,481 |
| Female Population | 47.1% | 48.5% | 50.5% |
| Male Population | 52.9% | 51.5% | 49.5% |
| Median Age | 29.6 | 42.7 | 38.4 |
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| Population - 2010 | 6,499 | 15,412 | 309,327,143 |
| Population - 2000 | 5,910 | 15,451 | 285,036,114 |
| Population - 1990 | 6,342 | 15,132 | 251,960,433 |
| Pop. 2000 to Now | 34.6% | -7.4% | 15.6% |
| Pop. 1990 to Now | 25.4% | -5.4% | 30.8% |
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| Population Density | 1,887.3 | 2,554.6 | 93.4 |
| Land Area | 3.7 | 5.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Seminole, TX | Sterling, IL | United States |
| Age 0 to 4 | 10.6% | 4.2% | 5.9% |
| Age 5 to 9 | 8.1% | 6.5% | 6.1% |
| Age 10 to 14 | 8.7% | 6.0% | 6.6% |
| Age 15 to 17 | 3.9% | 3.5% | 3.9% |
| Age 18 to 20 | 2.4% | 4.4% | 4.0% |
| Age 21 to 24 | 6.7% | 5.8% | 5.2% |
| Age 25 to 34 | 16.6% | 12.2% | 13.8% |
| Age 35 to 44 | 15.0% | 11.8% | 12.9% |
| Age 45 to 54 | 7.3% | 13.1% | 12.6% |
| Age 55 to 59 | 4.1% | 7.0% | 6.7% |
| Age 60 to 64 | 5.3% | 5.2% | 6.3% |
| Age 65 to 74 | 5.7% | 10.5% | 9.6% |
| Age 75 to 84 | 4.3% | 5.8% | 4.5% |
| Age 85 and over | 1.2% | 4.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Seminole, TX | Sterling, IL | United States |
| White | 41.0% | 67.1% | 59.4% |
| Black | 0.8% | 2.0% | 12.2% |
| Asian | 2.9% | 1.3% | 5.6% |
| Native American | 1.5% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 3.5% | 3.2% |
| Hispanic | 53.7% | 26.0% | 18.4% |
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| Marriage & Family | | | |
| | Seminole, TX | Sterling, IL | United States |
| Married Population | 62.9% | 40.8% | 49.8% |
| Currently Married | 61.8% | 38.9% | 48.0% |
| Married but Separated | 1.1% | 1.9% | 1.8% |
| Single Population | 37.1% | 59.2% | 50.2% |
| Never Married | 22.6% | 38.4% | 33.8% |
| Divorced | 10.2% | 12.9% | 10.8% |
| Widowed | 4.3% | 8.0% | 5.6% |
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| Household Size | 2.59 | 2.24 | 2.60 |
| Households | 2,637 | 6,467 | 124,010,992 |
| Family Households | 1,836 | 3,698 | 80,755,759 |
| Married couple, w/children | 39.7% | 20.6% | 30.5% |
| Married couple, no children | 44.1% | 40.6% | 42.9% |
| Non Family Households | 801 | 2,769 | 43,255,233 |
| Single householder, w/children | 10.9% | 30.0% | 15.8% |
| Single householder, no children | 5.3% | 8.9% | 10.8% |