| PEOPLE | Fairfield | Jacksonville | United States |
| Population | 42,510 | 821,784 | 308,035,306 |
| Pop. Density | 2,030 | 1,100 | 87 |
| Pop. Change | 0.91% | 12.82% | 8.07% |
| Median Age | 38.2 | 35.5 | 37.3 |
| Households | 17,415 | 323,106 | 116,716,292 |
| Household Size | 2.4 | 2.48 | 2.58 |
| Male Population | 48.17% | 48.47% | 49.27% |
| Female Population | 51.83% | 51.53% | 50.96% |
| Married Population | 48.71% | 43.81% | 47.02% |
| Single Population | 51.29% | 56.19% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 6.42% | 7.00% | 6.56% |
| Age 5 to 9 | 6.24% | 6.51% | 6.61% |
| Age 10 to 14 | 6.31% | 6.46% | 6.71% |
| Age 15 to 17 | 4.18% | 3.92% | 4.21% |
| Age 18 to 20 | 2.28% | 2.89% | 2.95% |
| Age 21 to 24 | 6.41% | 7.63% | 7.01% |
| Age 25 to 34 | 14.01% | 14.88% | 13.33% |
| Age 35 to 44 | 13.22% | 13.57% | 13.33% |
| Age 45 to 49 | 15.22% | 14.79% | 14.61% |
| Age 50 to 54 | 15.22% | 14.79% | 14.61% |
| Age 55 to 59 | 12.75% | 11.41% | 11.84% |
| Age 60 to 64 | 12.75% | 11.41% | 11.84% |
| Age 65 to 74 | 6.97% | 6.09% | 7.05% |
| Age 75 to 84 | 4.36% | 3.42% | 4.24% |
| Age 85 and over | 1.63% | 1.43% | 1.78% |
| RACE | | | |
| White | 79.01% | 59.44% | 72.41% |
| Black | 12.84% | 30.72% | 12.61% |
| Asian | 2.43% | 4.29% | 4.75% |
| American Indian | 0.26% | 0.40% | 0.95% |
| Other | 5.46% | 5.16% | 9.28% |
| Hispanic | 2.05% | 5.16% | 16.35% |
| Non-Hispanic | 97.95% | 94.84% | 83.65% |
| FAMILY | | | |
| Married, w/children | 27.75% | 26.57% | 30.42% |
| Married, no children | 44.60% | 38.84% | 42.46% |
| Single, w/children | 15.86% | 18.85% | 14.39% |
| Single, no children | 11.78% | 15.74% | 12.73% |
| Divorced | 12.79% | 13.33% | 10.62% |
| Separated | 3.92% | 5.34% | 4.97% |
| Widowed | 4.94% | 5.91% | 6.14% |
| Now Married | 47.88% | 44.69% | 46.32% |
| Never Married | 30.47% | 30.72% | 31.95% |
