| | Franklin Square, NY | Farmingville, NY | United States |
| Population | 32,381 | 16,909 | 329,725,481 |
| Female Population | 50.2% | 47.4% | 50.5% |
| Male Population | 49.8% | 52.6% | 49.5% |
| Median Age | 40.5 | 35 | 38.4 |
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| Population - 2010 | 29,678 | 16,016 | 309,327,143 |
| Population - 2000 | 29,342 | 16,458 | 285,036,114 |
| Population - 1990 | 28,205 | 14,842 | 251,960,433 |
| Pop. 2000 to Now | 10.4% | -8.4% | 15.6% |
| Pop. 1990 to Now | 14.9% | 1.5% | 30.8% |
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| Population Density | 11,251.2 | 4,103.1 | 93.4 |
| Land Area | 2.9 | 4.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Franklin Square, NY | Farmingville, NY | United States |
| Age 0 to 4 | 5.3% | 6.5% | 5.9% |
| Age 5 to 9 | 5.9% | 4.4% | 6.1% |
| Age 10 to 14 | 5.3% | 5.5% | 6.6% |
| Age 15 to 17 | 4.0% | 4.8% | 3.9% |
| Age 18 to 20 | 3.2% | 4.0% | 4.0% |
| Age 21 to 24 | 4.8% | 6.7% | 5.2% |
| Age 25 to 34 | 14.5% | 18.0% | 13.8% |
| Age 35 to 44 | 12.4% | 10.1% | 12.9% |
| Age 45 to 54 | 14.0% | 14.4% | 12.6% |
| Age 55 to 59 | 7.3% | 6.3% | 6.7% |
| Age 60 to 64 | 6.0% | 7.7% | 6.3% |
| Age 65 to 74 | 9.5% | 6.7% | 9.6% |
| Age 75 to 84 | 5.1% | 2.9% | 4.5% |
| Age 85 and over | 2.6% | 1.8% | 1.9% |
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| Race | | | |
| | Franklin Square, NY | Farmingville, NY | United States |
| White | 59.4% | 70.3% | 59.4% |
| Black | 3.3% | 6.1% | 12.2% |
| Asian | 13.9% | 4.4% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.8% | 1.2% | 0.4% |
| Two or More Races | 2.0% | 4.1% | 3.2% |
| Hispanic | 20.4% | 13.9% | 18.4% |
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| Marriage & Family | | | |
| | Franklin Square, NY | Farmingville, NY | United States |
| Married Population | 56.3% | 50.4% | 49.8% |
| Currently Married | 55.1% | 49.3% | 48.0% |
| Married but Separated | 1.2% | 1.1% | 1.8% |
| Single Population | 43.7% | 49.6% | 50.2% |
| Never Married | 31.5% | 39.9% | 33.8% |
| Divorced | 6.9% | 5.6% | 10.8% |
| Widowed | 5.2% | 4.1% | 5.6% |
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| Household Size | 3.28 | 3.52 | 2.60 |
| Households | 9,829 | 4,744 | 124,010,992 |
| Family Households | 8,109 | 4,105 | 80,755,759 |
| Married couple, w/children | 38.1% | 33.9% | 30.5% |
| Married couple, no children | 42.4% | 41.3% | 42.9% |
| Non Family Households | 1,720 | 639 | 43,255,233 |
| Single householder, w/children | 7.6% | 10.3% | 15.8% |
| Single householder, no children | 11.9% | 14.5% | 10.8% |