| | Massapequa Park, NY | Copiague, NY | United States |
| Population | 17,149 | 23,552 | 329,725,481 |
| Female Population | 51.1% | 51.5% | 50.5% |
| Male Population | 48.9% | 48.5% | 49.5% |
| Median Age | 43.6 | 40.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 17,135 | 20,620 | 309,327,143 |
| Population - 2000 | 17,499 | 21,922 | 285,036,114 |
| Population - 1990 | 18,044 | 20,769 | 251,960,433 |
| Pop. 2000 to Now | -2.7% | 3.3% | 15.6% |
| Pop. 1990 to Now | -5.6% | 9.1% | 30.8% |
| space4 | | | |
| Population Density | 7,823.5 | 7,617.1 | 93.4 |
| Land Area | 2.2 | 3.1 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Massapequa Park, NY | Copiague, NY | United States |
| Age 0 to 4 | 5.3% | 7.2% | 5.9% |
| Age 5 to 9 | 5.0% | 5.2% | 6.1% |
| Age 10 to 14 | 6.9% | 8.0% | 6.6% |
| Age 15 to 17 | 3.4% | 2.5% | 3.9% |
| Age 18 to 20 | 2.2% | 3.6% | 4.0% |
| Age 21 to 24 | 5.2% | 4.8% | 5.2% |
| Age 25 to 34 | 10.3% | 11.8% | 13.8% |
| Age 35 to 44 | 13.6% | 14.1% | 12.9% |
| Age 45 to 54 | 12.3% | 13.1% | 12.6% |
| Age 55 to 59 | 7.6% | 7.9% | 6.7% |
| Age 60 to 64 | 8.8% | 7.2% | 6.3% |
| Age 65 to 74 | 11.8% | 9.6% | 9.6% |
| Age 75 to 84 | 5.2% | 3.0% | 4.5% |
| Age 85 and over | 2.5% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Massapequa Park, NY | Copiague, NY | United States |
| White | 88.1% | 49.4% | 59.4% |
| Black | 0.5% | 4.9% | 12.2% |
| Asian | 2.5% | 2.5% | 5.6% |
| Native American | 0.0% | 1.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.0% | 0.9% | 0.4% |
| Two or More Races | 2.0% | 2.3% | 3.2% |
| Hispanic | 5.9% | 38.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Massapequa Park, NY | Copiague, NY | United States |
| Married Population | 61.9% | 47.9% | 49.8% |
| Currently Married | 61.6% | 44.9% | 48.0% |
| Married but Separated | 0.3% | 3.1% | 1.8% |
| Single Population | 38.1% | 52.1% | 50.2% |
| Never Married | 25.4% | 37.3% | 33.8% |
| Divorced | 6.3% | 9.5% | 10.8% |
| Widowed | 6.5% | 5.3% | 5.6% |
| space5 | | | |
| Household Size | 2.92 | 3.34 | 2.60 |
| Households | 5,859 | 7,027 | 124,010,992 |
| Family Households | 4,811 | 5,203 | 80,755,759 |
| Married couple, w/children | 36.0% | 28.2% | 30.5% |
| Married couple, no children | 50.3% | 38.4% | 42.9% |
| Non Family Households | 1,048 | 1,824 | 43,255,233 |
| Single householder, w/children | 4.1% | 16.4% | 15.8% |
| Single householder, no children | 9.6% | 17.0% | 10.8% |