| | Mahwah, NJ | Pearl River, NY | United States |
| Population | 25,530 | 16,387 | 329,725,481 |
| Female Population | 52.6% | 49.0% | 50.5% |
| Male Population | 47.4% | 51.0% | 49.5% |
| Median Age | 44 | 40 | 38.4 |
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| Population - 2010 | 25,912 | 14,578 | 309,327,143 |
| Population - 2000 | 24,062 | 15,553 | 285,036,114 |
| Population - 1990 | 17,905 | 15,314 | 251,960,433 |
| Pop. 2000 to Now | 8.4% | 4.7% | 15.6% |
| Pop. 1990 to Now | 45.7% | 6.3% | 30.8% |
| space4 | | | |
| Population Density | 993.6 | 2,411.6 | 93.4 |
| Land Area | 25.7 | 6.8 | 3,531,905.4 |
| Water Area | 0.5 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Mahwah, NJ | Pearl River, NY | United States |
| Age 0 to 4 | 4.1% | 6.5% | 5.9% |
| Age 5 to 9 | 4.8% | 5.8% | 6.1% |
| Age 10 to 14 | 6.3% | 5.4% | 6.6% |
| Age 15 to 17 | 4.7% | 3.6% | 3.9% |
| Age 18 to 20 | 8.5% | 3.4% | 4.0% |
| Age 21 to 24 | 6.8% | 6.4% | 5.2% |
| Age 25 to 34 | 5.7% | 11.2% | 13.8% |
| Age 35 to 44 | 11.1% | 12.2% | 12.9% |
| Age 45 to 54 | 14.7% | 14.0% | 12.6% |
| Age 55 to 59 | 6.8% | 7.7% | 6.7% |
| Age 60 to 64 | 7.0% | 5.9% | 6.3% |
| Age 65 to 74 | 12.0% | 8.6% | 9.6% |
| Age 75 to 84 | 6.0% | 5.7% | 4.5% |
| Age 85 and over | 1.6% | 3.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mahwah, NJ | Pearl River, NY | United States |
| White | 70.0% | 83.1% | 59.4% |
| Black | 2.1% | 0.7% | 12.2% |
| Asian | 12.5% | 3.8% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.1% | 0.4% |
| Two or More Races | 2.5% | 1.0% | 3.2% |
| Hispanic | 12.6% | 11.3% | 18.4% |
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| Marriage & Family | | | |
| | Mahwah, NJ | Pearl River, NY | United States |
| Married Population | 51.6% | 60.5% | 49.8% |
| Currently Married | 50.5% | 59.9% | 48.0% |
| Married but Separated | 1.1% | 0.6% | 1.8% |
| Single Population | 48.4% | 39.5% | 50.2% |
| Never Married | 35.9% | 27.4% | 33.8% |
| Divorced | 7.0% | 5.3% | 10.8% |
| Widowed | 5.5% | 6.7% | 5.6% |
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| Household Size | 2.46 | 2.82 | 2.60 |
| Households | 9,430 | 5,787 | 124,010,992 |
| Family Households | 6,154 | 4,424 | 80,755,759 |
| Married couple, w/children | 32.3% | 38.0% | 30.5% |
| Married couple, no children | 52.7% | 47.6% | 42.9% |
| Non Family Households | 3,276 | 1,363 | 43,255,233 |
| Single householder, w/children | 8.0% | 4.7% | 15.8% |
| Single householder, no children | 7.0% | 9.7% | 10.8% |