| | Rio Bravo, TX | Las Palmas, TX | United States |
| Population | 4,505 | 47 | 329,725,481 |
| Female Population | 53.9% | 57.5% | 50.5% |
| Male Population | 46.1% | 42.6% | 49.5% |
| Median Age | 23.4 | 48 | 38.4 |
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| Population - 2010 | 4,804 | 81 | 309,327,143 |
| Population - 2000 | 5,553 | 37 | 285,036,114 |
| Population - 1990 | 2,423 | 22 | 251,960,433 |
| Pop. 2000 to Now | -17.0% | -43.2% | 15.6% |
| Pop. 1990 to Now | 90.2% | -4.6% | 30.8% |
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| Population Density | 6,930.8 | 691.2 | 93.4 |
| Land Area | 0.7 | 0.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Rio Bravo, TX | Las Palmas, TX | United States |
| Age 0 to 4 | 10.7% | 0.0% | 5.9% |
| Age 5 to 9 | 10.1% | 0.0% | 6.1% |
| Age 10 to 14 | 10.5% | 0.0% | 6.6% |
| Age 15 to 17 | 8.3% | 0.0% | 3.9% |
| Age 18 to 20 | 4.4% | 0.0% | 4.0% |
| Age 21 to 24 | 8.3% | 0.0% | 5.2% |
| Age 25 to 34 | 11.3% | 17.0% | 13.8% |
| Age 35 to 44 | 9.5% | 0.0% | 12.9% |
| Age 45 to 54 | 9.4% | 83.0% | 12.6% |
| Age 55 to 59 | 3.2% | 0.0% | 6.7% |
| Age 60 to 64 | 6.0% | 0.0% | 6.3% |
| Age 65 to 74 | 7.6% | 0.0% | 9.6% |
| Age 75 to 84 | 0.4% | 0.0% | 4.5% |
| Age 85 and over | 0.3% | 0.0% | 1.9% |
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| Race | | | |
| | Rio Bravo, TX | Las Palmas, TX | United States |
| White | 3.7% | 0.0% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 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 | 96.3% | 100.0% | 18.4% |
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| Marriage & Family | | | |
| | Rio Bravo, TX | Las Palmas, TX | United States |
| Married Population | 48.9% | 0.0% | 49.8% |
| Currently Married | 46.9% | 0.0% | 48.0% |
| Married but Separated | 2.1% | 0.0% | 1.8% |
| Single Population | 51.1% | 100.0% | 50.2% |
| Never Married | 40.1% | 25.5% | 33.8% |
| Divorced | 6.5% | 42.6% | 10.8% |
| Widowed | 4.5% | 31.9% | 5.6% |
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| Household Size | 4.25 | 2.35 | 2.60 |
| Households | 1,059 | 20 | 124,010,992 |
| Family Households | 806 | 0 | 80,755,759 |
| Married couple, w/children | 49.0% | 0.0% | 30.5% |
| Married couple, no children | 24.6% | 0.0% | 42.9% |
| Non Family Households | 253 | 20 | 43,255,233 |
| Single householder, w/children | 20.8% | 0.0% | 15.8% |
| Single householder, no children | 5.6% | 0.0% | 10.8% |