| | La Joya, TX | Weslaco, TX | United States |
| Population | 4,486 | 40,393 | 329,725,481 |
| Female Population | 58.4% | 51.3% | 50.5% |
| Male Population | 41.6% | 48.7% | 49.5% |
| Median Age | 28.3 | 29.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,053 | 37,037 | 309,327,143 |
| Population - 2000 | 3,303 | 26,935 | 285,036,114 |
| Population - 1990 | 2,604 | 21,877 | 251,960,433 |
| Pop. 2000 to Now | 38.7% | 60.7% | 15.6% |
| Pop. 1990 to Now | 75.9% | 97.8% | 30.8% |
| space4 | | | |
| Population Density | 1,066.8 | 2,296.5 | 93.4 |
| Land Area | 4.2 | 17.6 | 3,531,905.4 |
| Water Area | 0.2 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | La Joya, TX | Weslaco, TX | United States |
| Age 0 to 4 | 12.1% | 8.9% | 5.9% |
| Age 5 to 9 | 8.8% | 9.5% | 6.1% |
| Age 10 to 14 | 6.6% | 9.8% | 6.6% |
| Age 15 to 17 | 6.4% | 6.1% | 3.9% |
| Age 18 to 20 | 3.8% | 3.9% | 4.0% |
| Age 21 to 24 | 6.2% | 5.8% | 5.2% |
| Age 25 to 34 | 21.1% | 13.5% | 13.8% |
| Age 35 to 44 | 9.2% | 11.2% | 12.9% |
| Age 45 to 54 | 12.7% | 11.0% | 12.6% |
| Age 55 to 59 | 1.9% | 4.4% | 6.7% |
| Age 60 to 64 | 2.0% | 3.7% | 6.3% |
| Age 65 to 74 | 5.8% | 6.6% | 9.6% |
| Age 75 to 84 | 2.2% | 4.1% | 4.5% |
| Age 85 and over | 1.4% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | La Joya, TX | Weslaco, TX | United States |
| White | 3.1% | 9.6% | 59.4% |
| Black | 0.0% | 1.2% | 12.2% |
| Asian | 1.2% | 0.4% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.0% | 0.0% | 3.2% |
| Hispanic | 95.7% | 88.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | La Joya, TX | Weslaco, TX | United States |
| Married Population | 41.4% | 51.1% | 49.8% |
| Currently Married | 38.1% | 48.3% | 48.0% |
| Married but Separated | 3.3% | 2.8% | 1.8% |
| Single Population | 58.6% | 48.9% | 50.2% |
| Never Married | 41.8% | 33.7% | 33.8% |
| Divorced | 11.7% | 9.3% | 10.8% |
| Widowed | 5.1% | 6.0% | 5.6% |
| space5 | | | |
| Household Size | 3.37 | 3.28 | 2.60 |
| Households | 1,333 | 12,198 | 124,010,992 |
| Family Households | 947 | 9,753 | 80,755,759 |
| Married couple, w/children | 31.6% | 37.3% | 30.5% |
| Married couple, no children | 21.6% | 25.5% | 42.9% |
| Non Family Households | 386 | 2,445 | 43,255,233 |
| Single householder, w/children | 38.1% | 22.1% | 15.8% |
| Single householder, no children | 8.7% | 15.0% | 10.8% |