| | Sparkill, NY | Pearl River, NY | United States |
| Population | 1,337 | 16,387 | 329,725,481 |
| Female Population | 47.0% | 49.0% | 50.5% |
| Male Population | 53.0% | 51.0% | 49.5% |
| Median Age | 39.2 | 40 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,381 | 14,578 | 309,327,143 |
| Population - 2000 | 1,819 | 15,553 | 285,036,114 |
| Population - 1990 | 1,329 | 15,314 | 251,960,433 |
| Pop. 2000 to Now | 5.1% | 4.7% | 15.6% |
| Pop. 1990 to Now | 43.9% | 6.3% | 30.8% |
| space4 | | | |
| Population Density | 2,527.4 | 2,411.6 | 93.4 |
| Land Area | 0.5 | 6.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Sparkill, NY | Pearl River, NY | United States |
| Age 0 to 4 | 9.3% | 6.5% | 5.9% |
| Age 5 to 9 | 4.3% | 5.8% | 6.1% |
| Age 10 to 14 | 4.2% | 5.4% | 6.6% |
| Age 15 to 17 | 1.9% | 3.6% | 3.9% |
| Age 18 to 20 | 3.1% | 3.4% | 4.0% |
| Age 21 to 24 | 2.5% | 6.4% | 5.2% |
| Age 25 to 34 | 12.1% | 11.2% | 13.8% |
| Age 35 to 44 | 20.7% | 12.2% | 12.9% |
| Age 45 to 54 | 6.2% | 14.0% | 12.6% |
| Age 55 to 59 | 19.9% | 7.7% | 6.7% |
| Age 60 to 64 | 5.3% | 5.9% | 6.3% |
| Age 65 to 74 | 4.9% | 8.6% | 9.6% |
| Age 75 to 84 | 3.9% | 5.7% | 4.5% |
| Age 85 and over | 1.7% | 3.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Sparkill, NY | Pearl River, NY | United States |
| White | 74.7% | 83.1% | 59.4% |
| Black | 0.0% | 0.7% | 12.2% |
| Asian | 15.6% | 3.8% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 1.5% | 1.0% | 3.2% |
| Hispanic | 8.2% | 11.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Sparkill, NY | Pearl River, NY | United States |
| Married Population | 60.9% | 60.5% | 49.8% |
| Currently Married | 60.9% | 59.9% | 48.0% |
| Married but Separated | 0.0% | 0.6% | 1.8% |
| Single Population | 39.1% | 39.5% | 50.2% |
| Never Married | 33.0% | 27.4% | 33.8% |
| Divorced | 1.5% | 5.3% | 10.8% |
| Widowed | 4.5% | 6.7% | 5.6% |
| space5 | | | |
| Household Size | 3.07 | 2.82 | 2.60 |
| Households | 436 | 5,787 | 124,010,992 |
| Family Households | 328 | 4,424 | 80,755,759 |
| Married couple, w/children | 39.3% | 38.0% | 30.5% |
| Married couple, no children | 56.1% | 47.6% | 42.9% |
| Non Family Households | 108 | 1,363 | 43,255,233 |
| Single householder, w/children | 1.8% | 4.7% | 15.8% |
| Single householder, no children | 2.7% | 9.7% | 10.8% |