| PEOPLE | St. Louis | Willits | United States |
| Population | 319,294 | 4,888 | 308,035,306 |
| Pop. Density | 5,157 | 1,747 | 87 |
| Pop. Change | -8.82% | -3.10% | 8.07% |
| Median Age | 34.1 | 37.6 | 37.3 |
| Households | 142,057 | 1,914 | 116,716,292 |
| Household Size | 2.16 | 2.53 | 2.58 |
| Male Population | 48.28% | 47.61% | 49.27% |
| Female Population | 51.72% | 52.39% | 50.96% |
| Married Population | 25.76% | 38.01% | 47.02% |
| Single Population | 74.24% | 61.99% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 6.60% | 7.14% | 6.56% |
| Age 5 to 9 | 5.44% | 7.02% | 6.61% |
| Age 10 to 14 | 5.30% | 7.36% | 6.71% |
| Age 15 to 17 | 3.81% | 4.46% | 4.21% |
| Age 18 to 20 | 3.25% | 2.58% | 2.95% |
| Age 21 to 24 | 9.04% | 5.85% | 7.01% |
| Age 25 to 34 | 18.06% | 12.34% | 13.33% |
| Age 35 to 44 | 12.60% | 12.03% | 13.33% |
| Age 45 to 49 | 14.03% | 13.15% | 14.61% |
| Age 50 to 54 | 14.03% | 13.15% | 14.61% |
| Age 55 to 59 | 10.84% | 12.89% | 11.84% |
| Age 60 to 64 | 10.84% | 12.89% | 11.84% |
| Age 65 to 74 | 5.54% | 7.47% | 7.05% |
| Age 75 to 84 | 3.79% | 4.32% | 4.24% |
| Age 85 and over | 1.68% | 3.40% | 1.78% |
| RACE | | | |
| White | 43.93% | 79.01% | 72.41% |
| Black | 49.22% | 0.70% | 12.61% |
| Asian | 2.91% | 1.39% | 4.75% |
| American Indian | 0.26% | 4.42% | 0.95% |
| Other | 3.68% | 14.48% | 9.28% |
| Hispanic | 5.02% | 5.16% | 16.35% |
| Non-Hispanic | 94.98% | 94.84% | 83.65% |
| FAMILY | | | |
| Married, w/children | 17.68% | 26.12% | 30.42% |
| Married, no children | 31.17% | 33.82% | 42.46% |
| Single, w/children | 26.33% | 23.53% | 14.39% |
| Single, no children | 24.82% | 16.52% | 12.73% |
| Divorced | 13.01% | 14.71% | 10.62% |
| Separated | 6.13% | 6.22% | 4.97% |
| Widowed | 7.75% | 7.86% | 6.14% |
| Now Married | 25.42% | 38.70% | 46.32% |
| Never Married | 47.68% | 32.51% | 31.95% |
