| | Old Bethpage, NY | Massapequa Park, NY | United States |
| Population | 5,574 | 17,149 | 329,725,481 |
| Female Population | 50.3% | 51.1% | 50.5% |
| Male Population | 49.7% | 48.9% | 49.5% |
| Median Age | 45.9 | 43.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,577 | 17,135 | 309,327,143 |
| Population - 2000 | 5,400 | 17,499 | 285,036,114 |
| Population - 1990 | 5,610 | 18,044 | 251,960,433 |
| Pop. 2000 to Now | 3.9% | -2.7% | 15.6% |
| Pop. 1990 to Now | 0.0% | -5.6% | 30.8% |
| space4 | | | |
| Population Density | 1,332.9 | 7,823.5 | 93.4 |
| Land Area | 4.2 | 2.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Old Bethpage, NY | Massapequa Park, NY | United States |
| Age 0 to 4 | 6.4% | 5.3% | 5.9% |
| Age 5 to 9 | 6.3% | 5.0% | 6.1% |
| Age 10 to 14 | 6.2% | 6.9% | 6.6% |
| Age 15 to 17 | 4.5% | 3.4% | 3.9% |
| Age 18 to 20 | 2.5% | 2.2% | 4.0% |
| Age 21 to 24 | 1.9% | 5.2% | 5.2% |
| Age 25 to 34 | 9.4% | 10.3% | 13.8% |
| Age 35 to 44 | 11.4% | 13.6% | 12.9% |
| Age 45 to 54 | 12.6% | 12.3% | 12.6% |
| Age 55 to 59 | 9.1% | 7.6% | 6.7% |
| Age 60 to 64 | 10.2% | 8.8% | 6.3% |
| Age 65 to 74 | 11.4% | 11.8% | 9.6% |
| Age 75 to 84 | 4.7% | 5.2% | 4.5% |
| Age 85 and over | 3.2% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Old Bethpage, NY | Massapequa Park, NY | United States |
| White | 79.9% | 88.1% | 59.4% |
| Black | 0.3% | 0.5% | 12.2% |
| Asian | 15.7% | 2.5% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.0% | 0.4% |
| Two or More Races | 1.6% | 2.0% | 3.2% |
| Hispanic | 2.5% | 5.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Old Bethpage, NY | Massapequa Park, NY | United States |
| Married Population | 67.9% | 61.9% | 49.8% |
| Currently Married | 66.7% | 61.6% | 48.0% |
| Married but Separated | 1.1% | 0.3% | 1.8% |
| Single Population | 32.1% | 38.1% | 50.2% |
| Never Married | 22.0% | 25.4% | 33.8% |
| Divorced | 4.6% | 6.3% | 10.8% |
| Widowed | 5.6% | 6.5% | 5.6% |
| space5 | | | |
| Household Size | 2.92 | 2.92 | 2.60 |
| Households | 1,897 | 5,859 | 124,010,992 |
| Family Households | 1,599 | 4,811 | 80,755,759 |
| Married couple, w/children | 35.1% | 36.0% | 30.5% |
| Married couple, no children | 53.6% | 50.3% | 42.9% |
| Non Family Households | 298 | 1,048 | 43,255,233 |
| Single householder, w/children | 3.6% | 4.1% | 15.8% |
| Single householder, no children | 7.8% | 9.6% | 10.8% |