| | Garden City South, NY | Floral Park, NY | United States |
| Population | 4,090 | 16,180 | 329,725,481 |
| Female Population | 51.2% | 48.4% | 50.5% |
| Male Population | 48.8% | 51.6% | 49.5% |
| Median Age | 43 | 43.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,788 | 15,836 | 309,327,143 |
| Population - 2000 | 3,974 | 15,967 | 285,036,114 |
| Population - 1990 | 4,073 | 15,947 | 251,960,433 |
| Pop. 2000 to Now | 2.8% | -1.5% | 15.6% |
| Pop. 1990 to Now | 0.3% | -1.3% | 30.8% |
| space4 | | | |
| Population Density | 10,098.8 | 11,434.6 | 93.4 |
| Land Area | 0.4 | 1.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Garden City South, NY | Floral Park, NY | United States |
| Age 0 to 4 | 5.7% | 4.9% | 5.9% |
| Age 5 to 9 | 5.7% | 7.0% | 6.1% |
| Age 10 to 14 | 4.1% | 6.4% | 6.6% |
| Age 15 to 17 | 4.1% | 3.7% | 3.9% |
| Age 18 to 20 | 1.6% | 3.4% | 4.0% |
| Age 21 to 24 | 6.9% | 4.3% | 5.2% |
| Age 25 to 34 | 13.5% | 11.3% | 13.8% |
| Age 35 to 44 | 9.5% | 13.6% | 12.9% |
| Age 45 to 54 | 11.0% | 13.7% | 12.6% |
| Age 55 to 59 | 9.0% | 6.9% | 6.7% |
| Age 60 to 64 | 9.3% | 6.9% | 6.3% |
| Age 65 to 74 | 8.8% | 10.5% | 9.6% |
| Age 75 to 84 | 4.6% | 4.1% | 4.5% |
| Age 85 and over | 6.0% | 3.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Garden City South, NY | Floral Park, NY | United States |
| White | 80.2% | 72.3% | 59.4% |
| Black | 0.4% | 1.5% | 12.2% |
| Asian | 9.5% | 13.0% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 1.2% | 1.0% | 3.2% |
| Hispanic | 8.6% | 12.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Garden City South, NY | Floral Park, NY | United States |
| Married Population | 53.6% | 61.3% | 49.8% |
| Currently Married | 52.4% | 60.1% | 48.0% |
| Married but Separated | 1.2% | 1.2% | 1.8% |
| Single Population | 46.4% | 38.7% | 50.2% |
| Never Married | 28.5% | 28.0% | 33.8% |
| Divorced | 8.6% | 6.3% | 10.8% |
| Widowed | 9.3% | 4.4% | 5.6% |
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| Household Size | 3.15 | 2.89 | 2.60 |
| Households | 1,296 | 5,598 | 124,010,992 |
| Family Households | 1,077 | 4,348 | 80,755,759 |
| Married couple, w/children | 31.4% | 39.0% | 30.5% |
| Married couple, no children | 41.5% | 48.8% | 42.9% |
| Non Family Households | 219 | 1,250 | 43,255,233 |
| Single householder, w/children | 7.0% | 5.0% | 15.8% |
| Single householder, no children | 20.1% | 7.3% | 10.8% |