| PEOPLE | Decatur | Spring Hill | United States |
| Population | 19,335 | 98,621 | 308,035,306 |
| Pop. Density | 4,527 | 1,649 | 87 |
| Pop. Change | 4.80% | 42.84% | 8.07% |
| Median Age | 37.8 | 44.3 | 37.3 |
| Households | 8,599 | 39,078 | 116,716,292 |
| Household Size | 2.17 | 2.48 | 2.58 |
| Male Population | 43.60% | 47.47% | 49.27% |
| Female Population | 56.40% | 52.53% | 50.96% |
| Married Population | 32.07% | 52.64% | 47.02% |
| Single Population | 67.93% | 47.36% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 7.35% | 5.34% | 6.56% |
| Age 5 to 9 | 6.85% | 5.94% | 6.61% |
| Age 10 to 14 | 5.66% | 6.50% | 6.71% |
| Age 15 to 17 | 2.73% | 3.87% | 4.21% |
| Age 18 to 20 | 2.48% | 2.27% | 2.95% |
| Age 21 to 24 | 5.24% | 5.00% | 7.01% |
| Age 25 to 34 | 14.64% | 9.92% | 13.33% |
| Age 35 to 44 | 18.16% | 11.98% | 13.33% |
| Age 45 to 49 | 14.61% | 13.72% | 14.61% |
| Age 50 to 54 | 14.61% | 13.72% | 14.61% |
| Age 55 to 59 | 11.14% | 13.31% | 11.84% |
| Age 60 to 64 | 11.14% | 13.31% | 11.84% |
| Age 65 to 74 | 5.64% | 11.63% | 7.05% |
| Age 75 to 84 | 3.64% | 7.75% | 4.24% |
| Age 85 and over | 1.85% | 2.78% | 1.78% |
| RACE | | | |
| White | 73.52% | 88.10% | 72.41% |
| Black | 20.22% | 5.11% | 12.61% |
| Asian | 2.92% | 1.40% | 4.75% |
| American Indian | 0.23% | 0.36% | 0.95% |
| Other | 3.11% | 5.03% | 9.28% |
| Hispanic | 2.21% | 2.69% | 16.35% |
| Non-Hispanic | 97.79% | 97.31% | 83.65% |
| FAMILY | | | |
| Married, w/children | 38.21% | 23.74% | 30.42% |
| Married, no children | 35.34% | 51.57% | 42.46% |
| Single, w/children | 15.30% | 12.99% | 14.39% |
| Single, no children | 11.16% | 11.70% | 12.73% |
| Divorced | 12.48% | 10.08% | 10.62% |
| Separated | 7.29% | 4.09% | 4.97% |
| Widowed | 8.28% | 10.59% | 6.14% |
| Now Married | 31.47% | 52.17% | 46.32% |
| Never Married | 40.48% | 23.08% | 31.95% |
