| PEOPLE | St. Louis | Clayton | United States |
| Population | 319,294 | 15,939 | 308,035,306 |
| Pop. Density | 5,157 | 6,436 | 87 |
| Pop. Change | -8.82% | 3.53% | 8.07% |
| Median Age | 34.1 | 29.4 | 37.3 |
| Households | 142,057 | 5,322 | 116,716,292 |
| Household Size | 2.16 | 2.11 | 2.58 |
| Male Population | 48.28% | 50.91% | 49.27% |
| Female Population | 51.72% | 49.09% | 50.96% |
| Married Population | 25.76% | 38.97% | 47.02% |
| Single Population | 74.24% | 61.03% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 6.60% | 2.99% | 6.56% |
| Age 5 to 9 | 5.44% | 4.48% | 6.61% |
| Age 10 to 14 | 5.30% | 4.85% | 6.71% |
| Age 15 to 17 | 3.81% | 3.47% | 4.21% |
| Age 18 to 20 | 3.25% | 15.10% | 2.95% |
| Age 21 to 24 | 9.04% | 12.47% | 7.01% |
| Age 25 to 34 | 18.06% | 12.47% | 13.33% |
| Age 35 to 44 | 12.60% | 10.73% | 13.33% |
| Age 45 to 49 | 14.03% | 11.56% | 14.61% |
| Age 50 to 54 | 14.03% | 11.56% | 14.61% |
| Age 55 to 59 | 10.84% | 10.12% | 11.84% |
| Age 60 to 64 | 10.84% | 10.12% | 11.84% |
| Age 65 to 74 | 5.54% | 5.52% | 7.05% |
| Age 75 to 84 | 3.79% | 4.23% | 4.24% |
| Age 85 and over | 1.68% | 2.00% | 1.78% |
| RACE | | | |
| White | 43.93% | 77.99% | 72.41% |
| Black | 49.22% | 8.19% | 12.61% |
| Asian | 2.91% | 10.80% | 4.75% |
| American Indian | 0.26% | 0.16% | 0.95% |
| Other | 3.68% | 2.85% | 9.28% |
| Hispanic | 5.02% | 3.66% | 16.35% |
| Non-Hispanic | 94.98% | 96.34% | 83.65% |
| FAMILY | | | |
| Married, w/children | 17.68% | 36.67% | 30.42% |
| Married, no children | 31.17% | 47.69% | 42.46% |
| Single, w/children | 26.33% | 10.44% | 14.39% |
| Single, no children | 24.82% | 5.20% | 12.73% |
| Divorced | 13.01% | 10.34% | 10.62% |
| Separated | 6.13% | 9.90% | 4.97% |
| Widowed | 7.75% | 5.63% | 6.14% |
| Now Married | 25.42% | 38.43% | 46.32% |
| Never Married | 47.68% | 35.70% | 31.95% |
