| | The Hills, TX | Wellesley, MA | United States |
| Population | 2,602 | 29,365 | 329,725,481 |
| Female Population | 53.9% | 56.7% | 50.5% |
| Male Population | 46.1% | 43.3% | 49.5% |
| Median Age | 56.1 | 35.3 | 38.4 |
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| Population - 2010 | 2,448 | 28,046 | 309,327,143 |
| Population - 2000 | 1,492 | 26,613 | 285,036,114 |
| Population - 1990 | 315 | 26,615 | 251,960,433 |
| Pop. 2000 to Now | 64.6% | 7.8% | 15.6% |
| Pop. 1990 to Now | 679.7% | 7.8% | 30.8% |
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| Population Density | 2,396.0 | 2,931.5 | 93.4 |
| Land Area | 1.1 | 10.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.5 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | The Hills, TX | Wellesley, MA | United States |
| Age 0 to 4 | 4.2% | 4.6% | 5.9% |
| Age 5 to 9 | 5.2% | 6.3% | 6.1% |
| Age 10 to 14 | 5.6% | 9.0% | 6.6% |
| Age 15 to 17 | 3.6% | 5.2% | 3.9% |
| Age 18 to 20 | 0.4% | 13.5% | 4.0% |
| Age 21 to 24 | 2.6% | 7.0% | 5.2% |
| Age 25 to 34 | 4.9% | 4.3% | 13.8% |
| Age 35 to 44 | 12.1% | 8.7% | 12.9% |
| Age 45 to 54 | 10.1% | 14.6% | 12.6% |
| Age 55 to 59 | 10.8% | 6.3% | 6.7% |
| Age 60 to 64 | 7.6% | 6.4% | 6.3% |
| Age 65 to 74 | 21.8% | 6.8% | 9.6% |
| Age 75 to 84 | 9.0% | 4.8% | 4.5% |
| Age 85 and over | 2.1% | 2.5% | 1.9% |
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| Race | | | |
| | The Hills, TX | Wellesley, MA | United States |
| White | 80.4% | 74.7% | 59.4% |
| Black | 0.6% | 2.5% | 12.2% |
| Asian | 3.0% | 13.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.7% | 0.4% | 0.4% |
| Two or More Races | 1.8% | 4.2% | 3.2% |
| Hispanic | 13.5% | 4.9% | 18.4% |
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| Marriage & Family | | | |
| | The Hills, TX | Wellesley, MA | United States |
| Married Population | 77.9% | 54.2% | 49.8% |
| Currently Married | 77.6% | 53.1% | 48.0% |
| Married but Separated | 0.3% | 1.1% | 1.8% |
| Single Population | 22.1% | 45.8% | 50.2% |
| Never Married | 12.4% | 37.6% | 33.8% |
| Divorced | 5.7% | 4.2% | 10.8% |
| Widowed | 4.0% | 4.0% | 5.6% |
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| Household Size | 2.42 | 2.82 | 2.60 |
| Households | 1,077 | 8,668 | 124,010,992 |
| Family Households | 906 | 6,800 | 80,755,759 |
| Married couple, w/children | 27.5% | 46.9% | 30.5% |
| Married couple, no children | 66.2% | 41.5% | 42.9% |
| Non Family Households | 171 | 1,868 | 43,255,233 |
| Single householder, w/children | 3.3% | 8.0% | 15.8% |
| Single householder, no children | 3.0% | 3.5% | 10.8% |