| | Town and Country, MO | Clayton, MO | United States |
| Population | 11,440 | 16,905 | 329,725,481 |
| Female Population | 49.9% | 51.3% | 50.5% |
| Male Population | 50.1% | 48.7% | 49.5% |
| Median Age | 51.8 | 29.2 | 38.4 |
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| Population - 2010 | 10,819 | 15,974 | 309,327,143 |
| Population - 2000 | 10,894 | 12,825 | 285,036,114 |
| Population - 1990 | 9,519 | 13,874 | 251,960,433 |
| Pop. 2000 to Now | 2.3% | 30.8% | 15.6% |
| Pop. 1990 to Now | 17.0% | 20.9% | 30.8% |
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| Population Density | 990.5 | 6,737.7 | 93.4 |
| Land Area | 11.6 | 2.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Town and Country, MO | Clayton, MO | United States |
| Age 0 to 4 | 2.9% | 3.3% | 5.9% |
| Age 5 to 9 | 5.5% | 4.7% | 6.1% |
| Age 10 to 14 | 7.1% | 6.5% | 6.6% |
| Age 15 to 17 | 4.4% | 3.5% | 3.9% |
| Age 18 to 20 | 3.3% | 20.3% | 4.0% |
| Age 21 to 24 | 3.0% | 7.8% | 5.2% |
| Age 25 to 34 | 3.6% | 9.9% | 13.8% |
| Age 35 to 44 | 10.8% | 10.8% | 12.9% |
| Age 45 to 54 | 17.4% | 11.2% | 12.6% |
| Age 55 to 59 | 7.3% | 5.8% | 6.7% |
| Age 60 to 64 | 6.2% | 4.3% | 6.3% |
| Age 65 to 74 | 15.3% | 6.5% | 9.6% |
| Age 75 to 84 | 8.3% | 3.9% | 4.5% |
| Age 85 and over | 5.1% | 1.7% | 1.9% |
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| Race | | | |
| | Town and Country, MO | Clayton, MO | United States |
| White | 81.5% | 72.8% | 59.4% |
| Black | 0.9% | 7.7% | 12.2% |
| Asian | 12.2% | 10.7% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.7% | 0.4% |
| Two or More Races | 2.5% | 4.8% | 3.2% |
| Hispanic | 2.1% | 3.3% | 18.4% |
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| Marriage & Family | | | |
| | Town and Country, MO | Clayton, MO | United States |
| Married Population | 68.1% | 40.2% | 49.8% |
| Currently Married | 67.6% | 39.9% | 48.0% |
| Married but Separated | 0.5% | 0.3% | 1.8% |
| Single Population | 31.9% | 59.8% | 50.2% |
| Never Married | 19.4% | 50.7% | 33.8% |
| Divorced | 4.8% | 5.9% | 10.8% |
| Widowed | 7.8% | 3.2% | 5.6% |
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| Household Size | 2.52 | 2.23 | 2.60 |
| Households | 4,194 | 5,566 | 124,010,992 |
| Family Households | 3,322 | 3,213 | 80,755,759 |
| Married couple, w/children | 36.5% | 39.2% | 30.5% |
| Married couple, no children | 59.5% | 45.5% | 42.9% |
| Non Family Households | 872 | 2,353 | 43,255,233 |
| Single householder, w/children | 2.3% | 11.6% | 15.8% |
| Single householder, no children | 1.7% | 3.7% | 10.8% |