| | Tappan, NY | Rock Hill, NY | United States |
| Population | 7,153 | 2,016 | 329,725,481 |
| Female Population | 50.7% | 45.7% | 50.5% |
| Male Population | 49.3% | 54.3% | 49.5% |
| Median Age | 45 | 52.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,179 | 1,652 | 309,327,143 |
| Population - 2000 | 6,757 | 1,056 | 285,036,114 |
| Population - 1990 | 6,867 | 834 | 251,960,433 |
| Pop. 2000 to Now | 5.4% | 43.3% | 15.6% |
| Pop. 1990 to Now | 3.7% | 81.4% | 30.8% |
| space4 | | | |
| Population Density | 2,594.5 | 574.7 | 93.4 |
| Land Area | 2.8 | 3.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.9 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Tappan, NY | Rock Hill, NY | United States |
| Age 0 to 4 | 3.6% | 5.2% | 5.9% |
| Age 5 to 9 | 4.1% | 1.8% | 6.1% |
| Age 10 to 14 | 7.6% | 5.8% | 6.6% |
| Age 15 to 17 | 4.8% | 3.7% | 3.9% |
| Age 18 to 20 | 3.0% | 1.4% | 4.0% |
| Age 21 to 24 | 5.4% | 2.5% | 5.2% |
| Age 25 to 34 | 10.2% | 11.4% | 13.8% |
| Age 35 to 44 | 11.2% | 10.5% | 12.9% |
| Age 45 to 54 | 16.5% | 9.8% | 12.6% |
| Age 55 to 59 | 8.4% | 7.7% | 6.7% |
| Age 60 to 64 | 6.5% | 7.4% | 6.3% |
| Age 65 to 74 | 8.5% | 20.0% | 9.6% |
| Age 75 to 84 | 7.4% | 11.2% | 4.5% |
| Age 85 and over | 2.6% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Tappan, NY | Rock Hill, NY | United States |
| White | 71.3% | 64.5% | 59.4% |
| Black | 4.5% | 12.9% | 12.2% |
| Asian | 11.9% | 1.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 1.3% | 3.2% |
| Hispanic | 11.4% | 20.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Tappan, NY | Rock Hill, NY | United States |
| Married Population | 60.7% | 49.7% | 49.8% |
| Currently Married | 60.2% | 49.2% | 48.0% |
| Married but Separated | 0.5% | 0.6% | 1.8% |
| Single Population | 39.3% | 50.3% | 50.2% |
| Never Married | 27.8% | 25.8% | 33.8% |
| Divorced | 6.9% | 17.5% | 10.8% |
| Widowed | 4.6% | 7.0% | 5.6% |
| space5 | | | |
| Household Size | 3.15 | 2.36 | 2.60 |
| Households | 2,265 | 847 | 124,010,992 |
| Family Households | 1,885 | 498 | 80,755,759 |
| Married couple, w/children | 41.4% | 22.1% | 30.5% |
| Married couple, no children | 45.7% | 56.6% | 42.9% |
| Non Family Households | 380 | 349 | 43,255,233 |
| Single householder, w/children | 3.5% | 13.9% | 15.8% |
| Single householder, no children | 9.3% | 7.4% | 10.8% |