| | Bethpage, NY | Medford, NY | United States |
| Population | 17,627 | 24,702 | 329,725,481 |
| Female Population | 50.2% | 51.3% | 50.5% |
| Male Population | 49.8% | 48.7% | 49.5% |
| Median Age | 47.3 | 42.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 16,627 | 24,638 | 309,327,143 |
| Population - 2000 | 16,543 | 21,985 | 285,036,114 |
| Population - 1990 | 15,761 | 21,274 | 251,960,433 |
| Pop. 2000 to Now | 2.6% | 8.5% | 15.6% |
| Pop. 1990 to Now | 7.7% | 12.1% | 30.8% |
| space4 | | | |
| Population Density | 4,929.3 | 2,287.4 | 93.4 |
| Land Area | 3.6 | 10.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Bethpage, NY | Medford, NY | United States |
| Age 0 to 4 | 4.8% | 3.7% | 5.9% |
| Age 5 to 9 | 6.7% | 6.5% | 6.1% |
| Age 10 to 14 | 5.0% | 6.1% | 6.6% |
| Age 15 to 17 | 3.2% | 4.0% | 3.9% |
| Age 18 to 20 | 1.9% | 4.0% | 4.0% |
| Age 21 to 24 | 4.7% | 4.4% | 5.2% |
| Age 25 to 34 | 9.8% | 13.1% | 13.8% |
| Age 35 to 44 | 10.8% | 12.3% | 12.9% |
| Age 45 to 54 | 14.3% | 12.4% | 12.6% |
| Age 55 to 59 | 7.7% | 7.1% | 6.7% |
| Age 60 to 64 | 8.4% | 6.3% | 6.3% |
| Age 65 to 74 | 11.8% | 11.9% | 9.6% |
| Age 75 to 84 | 5.7% | 6.6% | 4.5% |
| Age 85 and over | 5.0% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Bethpage, NY | Medford, NY | United States |
| White | 74.5% | 61.4% | 59.4% |
| Black | 0.2% | 6.3% | 12.2% |
| Asian | 10.8% | 2.6% | 5.6% |
| Native American | 0.6% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.3% | 0.4% |
| Two or More Races | 1.1% | 1.5% | 3.2% |
| Hispanic | 12.2% | 27.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Bethpage, NY | Medford, NY | United States |
| Married Population | 64.2% | 51.0% | 49.8% |
| Currently Married | 63.7% | 49.8% | 48.0% |
| Married but Separated | 0.6% | 1.2% | 1.8% |
| Single Population | 35.8% | 49.0% | 50.2% |
| Never Married | 22.9% | 35.4% | 33.8% |
| Divorced | 5.5% | 7.2% | 10.8% |
| Widowed | 7.3% | 6.5% | 5.6% |
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| Household Size | 2.89 | 3.02 | 2.60 |
| Households | 6,080 | 8,061 | 124,010,992 |
| Family Households | 4,752 | 5,658 | 80,755,759 |
| Married couple, w/children | 32.7% | 34.8% | 30.5% |
| Married couple, no children | 55.7% | 48.0% | 42.9% |
| Non Family Households | 1,328 | 2,403 | 43,255,233 |
| Single householder, w/children | 6.2% | 7.3% | 15.8% |
| Single householder, no children | 5.4% | 9.8% | 10.8% |