| | Willow Park, TX | Farmers Branch, TX | United States |
| Population | 4,815 | 36,091 | 329,725,481 |
| Female Population | 57.8% | 50.0% | 50.5% |
| Male Population | 42.2% | 50.0% | 49.5% |
| Median Age | 42 | 34.9 | 38.4 |
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| Population - 2010 | 3,986 | 29,178 | 309,327,143 |
| Population - 2000 | 2,849 | 27,508 | 285,036,114 |
| Population - 1990 | 2,328 | 24,250 | 251,960,433 |
| Pop. 2000 to Now | 110.4% | 86.8% | 15.6% |
| Pop. 1990 to Now | 157.5% | 111.9% | 30.8% |
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| Population Density | 741.8 | 3,047.2 | 93.4 |
| Land Area | 6.5 | 11.8 | 3,531,905.4 |
| Water Area | 0.1 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Willow Park, TX | Farmers Branch, TX | United States |
| Age 0 to 4 | 5.9% | 6.4% | 5.9% |
| Age 5 to 9 | 7.3% | 4.9% | 6.1% |
| Age 10 to 14 | 11.4% | 6.8% | 6.6% |
| Age 15 to 17 | 2.2% | 4.4% | 3.9% |
| Age 18 to 20 | 1.1% | 3.6% | 4.0% |
| Age 21 to 24 | 5.1% | 4.5% | 5.2% |
| Age 25 to 34 | 7.4% | 19.7% | 13.8% |
| Age 35 to 44 | 16.0% | 15.0% | 12.9% |
| Age 45 to 54 | 16.2% | 11.8% | 12.6% |
| Age 55 to 59 | 7.7% | 5.4% | 6.7% |
| Age 60 to 64 | 3.8% | 5.2% | 6.3% |
| Age 65 to 74 | 7.3% | 6.9% | 9.6% |
| Age 75 to 84 | 5.0% | 4.1% | 4.5% |
| Age 85 and over | 3.7% | 1.2% | 1.9% |
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| Race | | | |
| | Willow Park, TX | Farmers Branch, TX | United States |
| White | 88.6% | 35.1% | 59.4% |
| Black | 0.0% | 7.8% | 12.2% |
| Asian | 1.8% | 9.6% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 1.4% | 2.0% | 3.2% |
| Hispanic | 8.1% | 45.2% | 18.4% |
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| Marriage & Family | | | |
| | Willow Park, TX | Farmers Branch, TX | United States |
| Married Population | 68.9% | 48.3% | 49.8% |
| Currently Married | 68.9% | 46.1% | 48.0% |
| Married but Separated | 0.0% | 2.2% | 1.8% |
| Single Population | 31.1% | 51.7% | 50.2% |
| Never Married | 18.1% | 36.4% | 33.8% |
| Divorced | 9.2% | 11.3% | 10.8% |
| Widowed | 3.8% | 3.9% | 5.6% |
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| Household Size | 2.76 | 2.50 | 2.60 |
| Households | 1,743 | 14,367 | 124,010,992 |
| Family Households | 1,380 | 8,433 | 80,755,759 |
| Married couple, w/children | 46.4% | 32.6% | 30.5% |
| Married couple, no children | 42.4% | 39.6% | 42.9% |
| Non Family Households | 363 | 5,934 | 43,255,233 |
| Single householder, w/children | 5.9% | 13.8% | 15.8% |
| Single householder, no children | 5.3% | 14.0% | 10.8% |