| | Nanuet, NY | Amherst, NY | United States |
| Population | 19,624 | 128,783 | 329,725,481 |
| Female Population | 50.4% | 51.6% | 50.5% |
| Male Population | 49.6% | 48.4% | 49.5% |
| Median Age | 45.1 | 39.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 17,805 | 122,363 | 309,327,143 |
| Population - 2000 | 16,707 | 116,510 | 285,036,114 |
| Population - 1990 | 14,065 | 111,711 | 251,960,433 |
| Pop. 2000 to Now | 10.7% | 8.1% | 15.6% |
| Pop. 1990 to Now | 31.5% | 12.8% | 30.8% |
| space4 | | | |
| Population Density | 3,611.3 | 2,420.9 | 93.4 |
| Land Area | 5.4 | 53.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Nanuet, NY | Amherst, NY | United States |
| Age 0 to 4 | 4.5% | 5.1% | 5.9% |
| Age 5 to 9 | 3.4% | 5.1% | 6.1% |
| Age 10 to 14 | 6.4% | 5.9% | 6.6% |
| Age 15 to 17 | 4.4% | 3.8% | 3.9% |
| Age 18 to 20 | 2.3% | 6.6% | 4.0% |
| Age 21 to 24 | 4.3% | 6.2% | 5.2% |
| Age 25 to 34 | 13.1% | 11.4% | 13.8% |
| Age 35 to 44 | 11.3% | 11.9% | 12.9% |
| Age 45 to 54 | 15.9% | 11.0% | 12.6% |
| Age 55 to 59 | 7.5% | 6.6% | 6.7% |
| Age 60 to 64 | 7.1% | 5.6% | 6.3% |
| Age 65 to 74 | 11.0% | 11.3% | 9.6% |
| Age 75 to 84 | 6.2% | 5.7% | 4.5% |
| Age 85 and over | 2.6% | 3.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Nanuet, NY | Amherst, NY | United States |
| White | 54.8% | 76.7% | 59.4% |
| Black | 13.5% | 5.5% | 12.2% |
| Asian | 12.1% | 9.7% | 5.6% |
| Native American | 0.1% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.2% | 0.1% | 0.4% |
| Two or More Races | 2.4% | 3.1% | 3.2% |
| Hispanic | 16.0% | 4.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Nanuet, NY | Amherst, NY | United States |
| Married Population | 48.5% | 49.0% | 49.8% |
| Currently Married | 46.9% | 48.1% | 48.0% |
| Married but Separated | 1.6% | 0.9% | 1.8% |
| Single Population | 51.5% | 51.0% | 50.2% |
| Never Married | 35.3% | 35.5% | 33.8% |
| Divorced | 9.8% | 9.2% | 10.8% |
| Widowed | 6.4% | 6.4% | 5.6% |
| space5 | | | |
| Household Size | 2.74 | 2.33 | 2.60 |
| Households | 7,024 | 51,766 | 124,010,992 |
| Family Households | 4,887 | 31,132 | 80,755,759 |
| Married couple, w/children | 34.2% | 32.4% | 30.5% |
| Married couple, no children | 42.5% | 47.0% | 42.9% |
| Non Family Households | 2,137 | 20,634 | 43,255,233 |
| Single householder, w/children | 10.1% | 10.9% | 15.8% |
| Single householder, no children | 13.2% | 9.7% | 10.8% |