| | Dix Hills, NY | Richmond, VA | United States |
| Population | 24,739 | 225,676 | 329,725,481 |
| Female Population | 48.6% | 52.5% | 50.5% |
| Male Population | 51.4% | 47.5% | 49.5% |
| Median Age | 46.8 | 34.4 | 38.4 |
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| Population - 2010 | 26,548 | 204,375 | 309,327,143 |
| Population - 2000 | 26,024 | 197,790 | 285,036,114 |
| Population - 1990 | 25,849 | 203,056 | 251,960,433 |
| Pop. 2000 to Now | 5.0% | 17.4% | 15.6% |
| Pop. 1990 to Now | 5.7% | 14.4% | 30.8% |
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| Population Density | 1,552.2 | 3,766.7 | 93.4 |
| Land Area | 15.9 | 59.9 | 3,531,905.4 |
| Water Area | 0.0 | 2.7 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Dix Hills, NY | Richmond, VA | United States |
| Age 0 to 4 | 4.6% | 5.7% | 5.9% |
| Age 5 to 9 | 6.8% | 4.9% | 6.1% |
| Age 10 to 14 | 6.7% | 4.4% | 6.6% |
| Age 15 to 17 | 4.6% | 2.4% | 3.9% |
| Age 18 to 20 | 3.0% | 5.3% | 4.0% |
| Age 21 to 24 | 4.0% | 6.4% | 5.2% |
| Age 25 to 34 | 8.0% | 21.8% | 13.8% |
| Age 35 to 44 | 10.3% | 12.6% | 12.9% |
| Age 45 to 54 | 16.1% | 10.7% | 12.6% |
| Age 55 to 59 | 8.2% | 6.2% | 6.7% |
| Age 60 to 64 | 9.4% | 6.2% | 6.3% |
| Age 65 to 74 | 10.4% | 8.3% | 9.6% |
| Age 75 to 84 | 6.4% | 3.2% | 4.5% |
| Age 85 and over | 1.4% | 1.7% | 1.9% |
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| Race | | | |
| | Dix Hills, NY | Richmond, VA | United States |
| White | 71.4% | 41.4% | 59.4% |
| Black | 3.7% | 45.0% | 12.2% |
| Asian | 15.1% | 2.1% | 5.6% |
| Native American | 0.8% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.4% | 0.4% |
| Two or More Races | 2.6% | 3.6% | 3.2% |
| Hispanic | 6.1% | 7.3% | 18.4% |
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| Marriage & Family | | | |
| | Dix Hills, NY | Richmond, VA | United States |
| Married Population | 64.1% | 32.2% | 49.8% |
| Currently Married | 63.1% | 29.4% | 48.0% |
| Married but Separated | 1.1% | 2.8% | 1.8% |
| Single Population | 35.9% | 67.8% | 50.2% |
| Never Married | 24.5% | 51.2% | 33.8% |
| Divorced | 6.3% | 11.4% | 10.8% |
| Widowed | 5.1% | 5.2% | 5.6% |
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| Household Size | 3.15 | 2.19 | 2.60 |
| Households | 7,765 | 98,821 | 124,010,992 |
| Family Households | 6,698 | 43,875 | 80,755,759 |
| Married couple, w/children | 38.7% | 19.9% | 30.5% |
| Married couple, no children | 51.2% | 37.4% | 42.9% |
| Non Family Households | 1,067 | 54,946 | 43,255,233 |
| Single householder, w/children | 4.5% | 24.4% | 15.8% |
| Single householder, no children | 5.6% | 18.3% | 10.8% |