| | Glen Head, NY | East Williston, NY | United States |
| Population | 4,839 | 2,637 | 329,725,481 |
| Female Population | 54.9% | 51.3% | 50.5% |
| Male Population | 45.1% | 48.7% | 49.5% |
| Median Age | 46.3 | 43.6 | 38.4 |
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| Population - 2010 | 4,559 | 2,560 | 309,327,143 |
| Population - 2000 | 4,625 | 2,503 | 285,036,114 |
| Population - 1990 | 4,488 | 2,515 | 251,960,433 |
| Pop. 2000 to Now | 7.0% | 1.3% | 15.6% |
| Pop. 1990 to Now | 10.3% | 0.8% | 30.8% |
| space4 | | | |
| Population Density | 2,945.2 | 4,634.5 | 93.4 |
| Land Area | 1.6 | 0.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Glen Head, NY | East Williston, NY | United States |
| Age 0 to 4 | 4.2% | 5.5% | 5.9% |
| Age 5 to 9 | 3.5% | 9.0% | 6.1% |
| Age 10 to 14 | 8.2% | 6.2% | 6.6% |
| Age 15 to 17 | 6.0% | 4.4% | 3.9% |
| Age 18 to 20 | 4.3% | 2.3% | 4.0% |
| Age 21 to 24 | 4.1% | 6.8% | 5.2% |
| Age 25 to 34 | 9.7% | 4.9% | 13.8% |
| Age 35 to 44 | 9.1% | 13.0% | 12.9% |
| Age 45 to 54 | 14.6% | 12.2% | 12.6% |
| Age 55 to 59 | 10.5% | 5.5% | 6.7% |
| Age 60 to 64 | 7.0% | 10.7% | 6.3% |
| Age 65 to 74 | 10.0% | 10.7% | 9.6% |
| Age 75 to 84 | 5.1% | 5.2% | 4.5% |
| Age 85 and over | 3.7% | 3.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Glen Head, NY | East Williston, NY | United States |
| White | 81.7% | 77.9% | 59.4% |
| Black | 0.3% | 0.5% | 12.2% |
| Asian | 2.1% | 11.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.9% | 0.2% | 0.4% |
| Two or More Races | 3.0% | 3.3% | 3.2% |
| Hispanic | 12.0% | 6.4% | 18.4% |
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| Marriage & Family | | | |
| | Glen Head, NY | East Williston, NY | United States |
| Married Population | 52.9% | 62.6% | 49.8% |
| Currently Married | 52.3% | 61.8% | 48.0% |
| Married but Separated | 0.7% | 0.7% | 1.8% |
| Single Population | 47.1% | 37.4% | 50.2% |
| Never Married | 30.0% | 25.5% | 33.8% |
| Divorced | 10.6% | 4.4% | 10.8% |
| Widowed | 6.5% | 7.6% | 5.6% |
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| Household Size | 2.85 | 3.10 | 2.60 |
| Households | 1,692 | 851 | 124,010,992 |
| Family Households | 1,200 | 719 | 80,755,759 |
| Married couple, w/children | 32.8% | 45.2% | 30.5% |
| Married couple, no children | 49.6% | 43.3% | 42.9% |
| Non Family Households | 492 | 132 | 43,255,233 |
| Single householder, w/children | 8.3% | 3.3% | 15.8% |
| Single householder, no children | 9.3% | 8.2% | 10.8% |