| | Fox Chapel, PA | Clayton, CA | United States |
| Population | 5,314 | 11,136 | 329,725,481 |
| Female Population | 50.6% | 51.4% | 50.5% |
| Male Population | 49.4% | 48.6% | 49.5% |
| Median Age | 46.3 | 44.1 | 38.4 |
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| Population - 2010 | 5,202 | 10,941 | 309,327,143 |
| Population - 2000 | 5,436 | 10,762 | 285,036,114 |
| Population - 1990 | 5,319 | 7,317 | 251,960,433 |
| Pop. 2000 to Now | -7.0% | 7.1% | 15.6% |
| Pop. 1990 to Now | -4.9% | 57.5% | 30.8% |
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| Population Density | 675.6 | 2,900.0 | 93.4 |
| Land Area | 7.9 | 3.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Fox Chapel, PA | Clayton, CA | United States |
| Age 0 to 4 | 3.1% | 3.8% | 5.9% |
| Age 5 to 9 | 6.0% | 5.6% | 6.1% |
| Age 10 to 14 | 12.2% | 9.0% | 6.6% |
| Age 15 to 17 | 7.9% | 5.8% | 3.9% |
| Age 18 to 20 | 3.4% | 3.3% | 4.0% |
| Age 21 to 24 | 1.8% | 6.3% | 5.2% |
| Age 25 to 34 | 4.5% | 6.8% | 13.8% |
| Age 35 to 44 | 7.8% | 11.0% | 12.9% |
| Age 45 to 54 | 22.9% | 13.2% | 12.6% |
| Age 55 to 59 | 6.8% | 10.0% | 6.7% |
| Age 60 to 64 | 6.1% | 7.8% | 6.3% |
| Age 65 to 74 | 11.9% | 9.7% | 9.6% |
| Age 75 to 84 | 5.2% | 6.4% | 4.5% |
| Age 85 and over | 0.5% | 1.5% | 1.9% |
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| Race | | | |
| | Fox Chapel, PA | Clayton, CA | United States |
| White | 87.1% | 69.0% | 59.4% |
| Black | 0.0% | 1.5% | 12.2% |
| Asian | 6.0% | 11.4% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 2.2% | 0.4% | 0.4% |
| Two or More Races | 1.8% | 7.3% | 3.2% |
| Hispanic | 2.9% | 10.3% | 18.4% |
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| Marriage & Family | | | |
| | Fox Chapel, PA | Clayton, CA | United States |
| Married Population | 74.2% | 56.9% | 49.8% |
| Currently Married | 72.2% | 55.5% | 48.0% |
| Married but Separated | 2.0% | 1.5% | 1.8% |
| Single Population | 25.8% | 43.1% | 50.2% |
| Never Married | 19.0% | 27.3% | 33.8% |
| Divorced | 2.6% | 8.8% | 10.8% |
| Widowed | 4.2% | 6.9% | 5.6% |
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| Household Size | 3.01 | 2.79 | 2.60 |
| Households | 1,767 | 3,986 | 124,010,992 |
| Family Households | 1,584 | 3,091 | 80,755,759 |
| Married couple, w/children | 46.4% | 35.1% | 30.5% |
| Married couple, no children | 46.3% | 45.3% | 42.9% |
| Non Family Households | 183 | 895 | 43,255,233 |
| Single householder, w/children | 5.4% | 10.2% | 15.8% |
| Single householder, no children | 1.9% | 9.4% | 10.8% |