| | Wichita, KS | Clayton, MO | United States |
| Population | 394,574 | 16,905 | 329,725,481 |
| Female Population | 50.5% | 51.3% | 50.5% |
| Male Population | 49.5% | 48.7% | 49.5% |
| Median Age | 35.4 | 29.2 | 38.4 |
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| Population - 2010 | 382,740 | 15,974 | 309,327,143 |
| Population - 2000 | 344,284 | 12,825 | 285,036,114 |
| Population - 1990 | 304,011 | 13,874 | 251,960,433 |
| Pop. 2000 to Now | 13.8% | 30.8% | 15.6% |
| Pop. 1990 to Now | 28.9% | 20.9% | 30.8% |
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| Population Density | 2,447.4 | 6,737.7 | 93.4 |
| Land Area | 161.2 | 2.5 | 3,531,905.4 |
| Water Area | 4.4 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Wichita, KS | Clayton, MO | United States |
| Age 0 to 4 | 6.6% | 3.3% | 5.9% |
| Age 5 to 9 | 7.1% | 4.7% | 6.1% |
| Age 10 to 14 | 7.2% | 6.5% | 6.6% |
| Age 15 to 17 | 4.2% | 3.5% | 3.9% |
| Age 18 to 20 | 3.8% | 20.3% | 4.0% |
| Age 21 to 24 | 5.8% | 7.8% | 5.2% |
| Age 25 to 34 | 14.8% | 9.9% | 13.8% |
| Age 35 to 44 | 12.5% | 10.8% | 12.9% |
| Age 45 to 54 | 11.4% | 11.2% | 12.6% |
| Age 55 to 59 | 6.1% | 5.8% | 6.7% |
| Age 60 to 64 | 6.0% | 4.3% | 6.3% |
| Age 65 to 74 | 9.0% | 6.5% | 9.6% |
| Age 75 to 84 | 3.8% | 3.9% | 4.5% |
| Age 85 and over | 1.8% | 1.7% | 1.9% |
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| Race | | | |
| | Wichita, KS | Clayton, MO | United States |
| White | 61.9% | 72.8% | 59.4% |
| Black | 10.0% | 7.7% | 12.2% |
| Asian | 4.8% | 10.7% | 5.6% |
| Native American | 0.6% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.7% | 0.4% |
| Two or More Races | 4.8% | 4.8% | 3.2% |
| Hispanic | 17.6% | 3.3% | 18.4% |
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| Marriage & Family | | | |
| | Wichita, KS | Clayton, MO | United States |
| Married Population | 47.5% | 40.2% | 49.8% |
| Currently Married | 45.6% | 39.9% | 48.0% |
| Married but Separated | 1.9% | 0.3% | 1.8% |
| Single Population | 52.6% | 59.8% | 50.2% |
| Never Married | 33.7% | 50.7% | 33.8% |
| Divorced | 13.8% | 5.9% | 10.8% |
| Widowed | 5.0% | 3.2% | 5.6% |
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| Household Size | 2.51 | 2.23 | 2.60 |
| Households | 155,184 | 5,566 | 124,010,992 |
| Family Households | 94,245 | 3,213 | 80,755,759 |
| Married couple, w/children | 28.9% | 39.2% | 30.5% |
| Married couple, no children | 41.1% | 45.5% | 42.9% |
| Non Family Households | 60,939 | 2,353 | 43,255,233 |
| Single householder, w/children | 19.9% | 11.6% | 15.8% |
| Single householder, no children | 10.2% | 3.7% | 10.8% |