| PEOPLE | Ballwin | South El Monte | United States |
| Population | 30,404 | 20,116 | 308,035,306 |
| Pop. Density | 3,382 | 7,075 | 87 |
| Pop. Change | -3.96% | -0.80% | 8.07% |
| Median Age | 41.3 | 30.5 | 37.3 |
| Households | 11,874 | 4,569 | 116,716,292 |
| Household Size | 2.58 | 4.39 | 2.58 |
| Male Population | 48.16% | 50.47% | 49.27% |
| Female Population | 51.84% | 49.53% | 50.96% |
| Married Population | 61.55% | 35.70% | 47.02% |
| Single Population | 38.45% | 64.30% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.88% | 8.42% | 6.56% |
| Age 5 to 9 | 7.14% | 7.77% | 6.61% |
| Age 10 to 14 | 7.37% | 8.44% | 6.71% |
| Age 15 to 17 | 4.48% | 5.40% | 4.21% |
| Age 18 to 20 | 2.14% | 3.43% | 2.95% |
| Age 21 to 24 | 4.70% | 8.12% | 7.01% |
| Age 25 to 34 | 10.27% | 15.24% | 13.33% |
| Age 35 to 44 | 13.47% | 14.06% | 13.33% |
| Age 45 to 49 | 16.54% | 11.97% | 14.61% |
| Age 50 to 54 | 16.54% | 11.97% | 14.61% |
| Age 55 to 59 | 12.92% | 8.22% | 11.84% |
| Age 60 to 64 | 12.92% | 8.22% | 11.84% |
| Age 65 to 74 | 8.04% | 4.99% | 7.05% |
| Age 75 to 84 | 5.49% | 3.06% | 4.24% |
| Age 85 and over | 1.57% | 0.88% | 1.78% |
| RACE | | | |
| White | 89.34% | 50.39% | 72.41% |
| Black | 2.46% | 0.53% | 12.61% |
| Asian | 5.60% | 10.99% | 4.75% |
| American Indian | 0.22% | 1.24% | 0.95% |
| Other | 2.37% | 36.85% | 9.28% |
| Hispanic | 4.96% | 58.36% | 16.35% |
| Non-Hispanic | 95.04% | 41.64% | 83.65% |
| FAMILY | | | |
| Married, w/children | 36.23% | 34.55% | 30.42% |
| Married, no children | 47.57% | 29.25% | 42.46% |
| Single, w/children | 8.37% | 15.31% | 14.39% |
| Single, no children | 7.83% | 20.88% | 12.73% |
| Divorced | 8.35% | 6.13% | 10.62% |
| Separated | 1.34% | 12.28% | 4.97% |
| Widowed | 4.42% | 5.08% | 6.14% |
| Now Married | 60.90% | 36.10% | 46.32% |
| Never Married | 25.00% | 40.41% | 31.95% |
