| | Hollis, NH | Dix Hills, NY | United States |
| Population | 8,324 | 24,739 | 329,725,481 |
| Female Population | 50.6% | 48.6% | 50.5% |
| Male Population | 49.5% | 51.4% | 49.5% |
| Median Age | 48.5 | 46.8 | 38.4 |
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| Population - 2010 | 7,704 | 26,548 | 309,327,143 |
| Population - 2000 | 7,015 | 26,024 | 285,036,114 |
| Population - 1990 | 5,705 | 25,849 | 251,960,433 |
| Pop. 2000 to Now | 15.8% | 5.0% | 15.6% |
| Pop. 1990 to Now | 42.4% | 5.7% | 30.8% |
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| Population Density | 262.1 | 1,552.2 | 93.4 |
| Land Area | 31.8 | 15.9 | 3,531,905.4 |
| Water Area | 0.6 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Hollis, NH | Dix Hills, NY | United States |
| Age 0 to 4 | 3.8% | 4.6% | 5.9% |
| Age 5 to 9 | 4.7% | 6.8% | 6.1% |
| Age 10 to 14 | 7.1% | 6.7% | 6.6% |
| Age 15 to 17 | 6.2% | 4.6% | 3.9% |
| Age 18 to 20 | 1.8% | 3.0% | 4.0% |
| Age 21 to 24 | 3.1% | 4.0% | 5.2% |
| Age 25 to 34 | 6.2% | 8.0% | 13.8% |
| Age 35 to 44 | 10.2% | 10.3% | 12.9% |
| Age 45 to 54 | 16.4% | 16.1% | 12.6% |
| Age 55 to 59 | 10.7% | 8.2% | 6.7% |
| Age 60 to 64 | 8.5% | 9.4% | 6.3% |
| Age 65 to 74 | 13.4% | 10.4% | 9.6% |
| Age 75 to 84 | 7.6% | 6.4% | 4.5% |
| Age 85 and over | 0.4% | 1.4% | 1.9% |
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| Race | | | |
| | Hollis, NH | Dix Hills, NY | United States |
| White | 86.4% | 71.4% | 59.4% |
| Black | 1.1% | 3.7% | 12.2% |
| Asian | 2.6% | 15.1% | 5.6% |
| Native American | 0.1% | 0.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.5% | 0.3% | 0.4% |
| Two or More Races | 6.8% | 2.6% | 3.2% |
| Hispanic | 2.3% | 6.1% | 18.4% |
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| Marriage & Family | | | |
| | Hollis, NH | Dix Hills, NY | United States |
| Married Population | 62.8% | 64.1% | 49.8% |
| Currently Married | 61.8% | 63.1% | 48.0% |
| Married but Separated | 1.1% | 1.1% | 1.8% |
| Single Population | 37.2% | 35.9% | 50.2% |
| Never Married | 25.4% | 24.5% | 33.8% |
| Divorced | 7.4% | 6.3% | 10.8% |
| Widowed | 4.4% | 5.1% | 5.6% |
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| Household Size | 2.58 | 3.15 | 2.60 |
| Households | 3,223 | 7,765 | 124,010,992 |
| Family Households | 2,328 | 6,698 | 80,755,759 |
| Married couple, w/children | 40.6% | 38.7% | 30.5% |
| Married couple, no children | 50.7% | 51.2% | 42.9% |
| Non Family Households | 895 | 1,067 | 43,255,233 |
| Single householder, w/children | 3.7% | 4.5% | 15.8% |
| Single householder, no children | 5.0% | 5.6% | 10.8% |