| | Sewickley, PA | Fox Chapel, PA | United States |
| Population | 3,889 | 5,314 | 329,725,481 |
| Female Population | 53.7% | 50.6% | 50.5% |
| Male Population | 46.3% | 49.4% | 49.5% |
| Median Age | 38.9 | 46.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,819 | 5,202 | 309,327,143 |
| Population - 2000 | 3,902 | 5,436 | 285,036,114 |
| Population - 1990 | 4,134 | 5,319 | 251,960,433 |
| Pop. 2000 to Now | -3.4% | -7.0% | 15.6% |
| Pop. 1990 to Now | -8.9% | -4.9% | 30.8% |
| space4 | | | |
| Population Density | 3,892.9 | 675.6 | 93.4 |
| Land Area | 1.0 | 7.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Sewickley, PA | Fox Chapel, PA | United States |
| Age 0 to 4 | 6.2% | 3.1% | 5.9% |
| Age 5 to 9 | 6.5% | 6.0% | 6.1% |
| Age 10 to 14 | 7.0% | 12.2% | 6.6% |
| Age 15 to 17 | 3.6% | 7.9% | 3.9% |
| Age 18 to 20 | 3.6% | 3.4% | 4.0% |
| Age 21 to 24 | 5.2% | 1.8% | 5.2% |
| Age 25 to 34 | 12.6% | 4.5% | 13.8% |
| Age 35 to 44 | 12.1% | 7.8% | 12.9% |
| Age 45 to 54 | 13.0% | 22.9% | 12.6% |
| Age 55 to 59 | 6.1% | 6.8% | 6.7% |
| Age 60 to 64 | 4.5% | 6.1% | 6.3% |
| Age 65 to 74 | 7.6% | 11.9% | 9.6% |
| Age 75 to 84 | 7.6% | 5.2% | 4.5% |
| Age 85 and over | 4.3% | 0.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Sewickley, PA | Fox Chapel, PA | United States |
| White | 80.3% | 87.1% | 59.4% |
| Black | 8.8% | 0.0% | 12.2% |
| Asian | 2.0% | 6.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.9% | 2.2% | 0.4% |
| Two or More Races | 6.8% | 1.8% | 3.2% |
| Hispanic | 1.2% | 2.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Sewickley, PA | Fox Chapel, PA | United States |
| Married Population | 59.4% | 74.2% | 49.8% |
| Currently Married | 58.3% | 72.2% | 48.0% |
| Married but Separated | 1.1% | 2.0% | 1.8% |
| Single Population | 40.6% | 25.8% | 50.2% |
| Never Married | 26.3% | 19.0% | 33.8% |
| Divorced | 8.5% | 2.6% | 10.8% |
| Widowed | 5.9% | 4.2% | 5.6% |
| space5 | | | |
| Household Size | 2.28 | 3.01 | 2.60 |
| Households | 1,702 | 1,767 | 124,010,992 |
| Family Households | 1,070 | 1,584 | 80,755,759 |
| Married couple, w/children | 40.2% | 46.4% | 30.5% |
| Married couple, no children | 43.1% | 46.3% | 42.9% |
| Non Family Households | 632 | 183 | 43,255,233 |
| Single householder, w/children | 14.5% | 5.4% | 15.8% |
| Single householder, no children | 2.2% | 1.9% | 10.8% |