| | Lake Grove, NY | Kings Park, NY | United States |
| Population | 11,110 | 16,008 | 329,725,481 |
| Female Population | 45.9% | 53.0% | 50.5% |
| Male Population | 54.1% | 47.0% | 49.5% |
| Median Age | 40.3 | 45.9 | 38.4 |
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| Population - 2010 | 11,202 | 16,981 | 309,327,143 |
| Population - 2000 | 10,250 | 16,146 | 285,036,114 |
| Population - 1990 | 9,612 | 17,773 | 251,960,433 |
| Pop. 2000 to Now | 7.9% | 2.4% | 15.6% |
| Pop. 1990 to Now | 15.0% | -7.0% | 30.8% |
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| Population Density | 3,759.7 | 2,569.1 | 93.4 |
| Land Area | 3.0 | 6.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Lake Grove, NY | Kings Park, NY | United States |
| Age 0 to 4 | 4.5% | 5.0% | 5.9% |
| Age 5 to 9 | 8.0% | 5.8% | 6.1% |
| Age 10 to 14 | 8.4% | 4.7% | 6.6% |
| Age 15 to 17 | 3.3% | 4.6% | 3.9% |
| Age 18 to 20 | 2.8% | 2.0% | 4.0% |
| Age 21 to 24 | 5.9% | 3.8% | 5.2% |
| Age 25 to 34 | 11.1% | 11.4% | 13.8% |
| Age 35 to 44 | 11.2% | 12.2% | 12.9% |
| Age 45 to 54 | 15.1% | 15.5% | 12.6% |
| Age 55 to 59 | 9.4% | 6.7% | 6.7% |
| Age 60 to 64 | 5.3% | 6.6% | 6.3% |
| Age 65 to 74 | 6.9% | 9.6% | 9.6% |
| Age 75 to 84 | 5.7% | 5.9% | 4.5% |
| Age 85 and over | 2.4% | 6.3% | 1.9% |
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| Race | | | |
| | Lake Grove, NY | Kings Park, NY | United States |
| White | 72.4% | 88.0% | 59.4% |
| Black | 2.2% | 0.6% | 12.2% |
| Asian | 9.5% | 3.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 1.4% | 1.1% | 3.2% |
| Hispanic | 14.2% | 7.3% | 18.4% |
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| Marriage & Family | | | |
| | Lake Grove, NY | Kings Park, NY | United States |
| Married Population | 56.9% | 52.1% | 49.8% |
| Currently Married | 56.3% | 51.8% | 48.0% |
| Married but Separated | 0.6% | 0.4% | 1.8% |
| Single Population | 43.1% | 47.9% | 50.2% |
| Never Married | 29.4% | 28.6% | 33.8% |
| Divorced | 7.9% | 10.2% | 10.8% |
| Widowed | 5.9% | 9.1% | 5.6% |
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| Household Size | 3.01 | 2.54 | 2.60 |
| Households | 3,686 | 6,188 | 124,010,992 |
| Family Households | 2,843 | 4,008 | 80,755,759 |
| Married couple, w/children | 35.4% | 35.3% | 30.5% |
| Married couple, no children | 44.7% | 44.2% | 42.9% |
| Non Family Households | 843 | 2,180 | 43,255,233 |
| Single householder, w/children | 6.8% | 6.5% | 15.8% |
| Single householder, no children | 13.2% | 14.0% | 10.8% |