| PEOPLE | Jefferson City | Streator | United States |
| Population | 43,079 | 13,710 | 308,035,306 |
| Pop. Density | 1,198 | 2,260 | 87 |
| Pop. Change | 6.95% | -5.36% | 8.07% |
| Median Age | 37.4 | 39.9 | 37.3 |
| Households | 17,278 | 5,621 | 116,716,292 |
| Household Size | 2.22 | 2.43 | 2.58 |
| Male Population | 51.24% | 48.29% | 49.27% |
| Female Population | 48.76% | 51.71% | 50.96% |
| Married Population | 43.82% | 48.72% | 47.02% |
| Single Population | 56.18% | 51.28% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 6.51% | 6.22% | 6.56% |
| Age 5 to 9 | 5.80% | 6.83% | 6.61% |
| Age 10 to 14 | 5.41% | 7.05% | 6.71% |
| Age 15 to 17 | 3.19% | 4.25% | 4.21% |
| Age 18 to 20 | 3.04% | 2.79% | 2.95% |
| Age 21 to 24 | 7.33% | 5.99% | 7.01% |
| Age 25 to 34 | 15.46% | 11.96% | 13.33% |
| Age 35 to 44 | 13.02% | 10.65% | 13.33% |
| Age 45 to 49 | 14.54% | 14.86% | 14.61% |
| Age 50 to 54 | 14.54% | 14.86% | 14.61% |
| Age 55 to 59 | 12.27% | 11.71% | 11.84% |
| Age 60 to 64 | 12.27% | 11.71% | 11.84% |
| Age 65 to 74 | 6.33% | 8.16% | 7.05% |
| Age 75 to 84 | 4.68% | 6.18% | 4.24% |
| Age 85 and over | 2.41% | 3.35% | 1.78% |
| RACE | | | |
| White | 77.99% | 91.21% | 72.41% |
| Black | 16.86% | 2.48% | 12.61% |
| Asian | 1.75% | 0.44% | 4.75% |
| American Indian | 0.33% | 0.31% | 0.95% |
| Other | 3.06% | 5.57% | 9.28% |
| Hispanic | 14.62% | 5.54% | 16.35% |
| Non-Hispanic | 85.38% | 94.46% | 83.65% |
| FAMILY | | | |
| Married, w/children | 28.04% | 24.19% | 30.42% |
| Married, no children | 44.03% | 43.38% | 42.46% |
| Single, w/children | 18.08% | 18.99% | 14.39% |
| Single, no children | 9.86% | 13.44% | 12.73% |
| Divorced | 14.33% | 11.81% | 10.62% |
| Separated | 3.87% | 1.83% | 4.97% |
| Widowed | 8.04% | 10.86% | 6.14% |
| Now Married | 43.86% | 48.89% | 46.32% |
| Never Married | 29.90% | 26.61% | 31.95% |
