| | Wilton, CT | Clayton, DE | United States |
| Population | 18,486 | 3,845 | 329,725,481 |
| Female Population | 48.8% | 50.4% | 50.5% |
| Male Population | 51.2% | 49.6% | 49.5% |
| Median Age | 44.1 | 35.9 | 38.4 |
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| Population - 2010 | 18,056 | 2,946 | 309,327,143 |
| Population - 2000 | 17,633 | 1,273 | 285,036,114 |
| Population - 1990 | 15,989 | 1,163 | 251,960,433 |
| Pop. 2000 to Now | 3.3% | 185.2% | 15.6% |
| Pop. 1990 to Now | 14.0% | 212.1% | 30.8% |
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| Population Density | 690.1 | 2,014.1 | 93.4 |
| Land Area | 26.8 | 1.9 | 3,531,905.4 |
| Water Area | 0.5 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Wilton, CT | Clayton, DE | United States |
| Age 0 to 4 | 4.5% | 7.5% | 5.9% |
| Age 5 to 9 | 6.7% | 12.0% | 6.1% |
| Age 10 to 14 | 9.2% | 9.0% | 6.6% |
| Age 15 to 17 | 7.2% | 5.6% | 3.9% |
| Age 18 to 20 | 3.5% | 3.6% | 4.0% |
| Age 21 to 24 | 3.7% | 2.7% | 5.2% |
| Age 25 to 34 | 5.5% | 7.5% | 13.8% |
| Age 35 to 44 | 11.2% | 16.7% | 12.9% |
| Age 45 to 54 | 17.8% | 15.5% | 12.6% |
| Age 55 to 59 | 8.1% | 4.1% | 6.7% |
| Age 60 to 64 | 6.7% | 6.7% | 6.3% |
| Age 65 to 74 | 9.9% | 5.9% | 9.6% |
| Age 75 to 84 | 4.8% | 1.9% | 4.5% |
| Age 85 and over | 1.2% | 1.4% | 1.9% |
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| Race | | | |
| | Wilton, CT | Clayton, DE | United States |
| White | 80.9% | 49.8% | 59.4% |
| Black | 0.9% | 33.8% | 12.2% |
| Asian | 8.1% | 2.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.2% | 0.4% |
| Two or More Races | 5.6% | 3.6% | 3.2% |
| Hispanic | 4.2% | 9.9% | 18.4% |
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| Marriage & Family | | | |
| | Wilton, CT | Clayton, DE | United States |
| Married Population | 62.4% | 51.8% | 49.8% |
| Currently Married | 62.0% | 49.9% | 48.0% |
| Married but Separated | 0.5% | 1.9% | 1.8% |
| Single Population | 37.6% | 48.2% | 50.2% |
| Never Married | 25.4% | 30.8% | 33.8% |
| Divorced | 6.6% | 10.8% | 10.8% |
| Widowed | 5.6% | 6.6% | 5.6% |
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| Household Size | 2.95 | 3.41 | 2.60 |
| Households | 6,198 | 1,128 | 124,010,992 |
| Family Households | 5,016 | 922 | 80,755,759 |
| Married couple, w/children | 45.0% | 45.9% | 30.5% |
| Married couple, no children | 42.7% | 23.0% | 42.9% |
| Non Family Households | 1,182 | 206 | 43,255,233 |
| Single householder, w/children | 6.4% | 22.2% | 15.8% |
| Single householder, no children | 5.8% | 8.9% | 10.8% |