| PEOPLE | Fort Madison | Nauvoo | United States |
| Population | 11,051 | 1,149 | 308,035,306 |
| Pop. Density | 1,164 | 339 | 87 |
| Pop. Change | -5.57% | 9.23% | 8.07% |
| Median Age | 39.9 | 52 | 37.3 |
| Households | 4,403 | 494 | 116,716,292 |
| Household Size | 2.26 | 2.27 | 2.58 |
| Male Population | 52.83% | 47.52% | 49.27% |
| Female Population | 47.17% | 52.48% | 50.96% |
| Married Population | 51.65% | 54.68% | 47.02% |
| Single Population | 48.35% | 45.32% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.77% | 5.13% | 6.56% |
| Age 5 to 9 | 5.85% | 4.70% | 6.61% |
| Age 10 to 14 | 5.85% | 6.44% | 6.71% |
| Age 15 to 17 | 3.53% | 3.66% | 4.21% |
| Age 18 to 20 | 2.52% | 2.26% | 2.95% |
| Age 21 to 24 | 6.66% | 4.44% | 7.01% |
| Age 25 to 34 | 14.22% | 7.66% | 13.33% |
| Age 35 to 44 | 11.95% | 8.44% | 13.33% |
| Age 45 to 49 | 15.02% | 10.88% | 14.61% |
| Age 50 to 54 | 15.02% | 10.88% | 14.61% |
| Age 55 to 59 | 12.95% | 16.54% | 11.84% |
| Age 60 to 64 | 12.95% | 16.54% | 11.84% |
| Age 65 to 74 | 7.28% | 20.28% | 7.05% |
| Age 75 to 84 | 5.54% | 8.18% | 4.24% |
| Age 85 and over | 2.85% | 1.39% | 1.78% |
| RACE | | | |
| White | 89.33% | 97.65% | 72.41% |
| Black | 5.54% | 0.61% | 12.61% |
| Asian | 0.55% | 0.00% | 4.75% |
| American Indian | 0.38% | 0.26% | 0.95% |
| Other | 4.20% | 1.48% | 9.28% |
| Hispanic | 2.99% | 1.19% | 16.35% |
| Non-Hispanic | 97.01% | 98.81% | 83.65% |
| FAMILY | | | |
| Married, w/children | 22.53% | 18.52% | 30.42% |
| Married, no children | 46.23% | 67.24% | 42.46% |
| Single, w/children | 20.55% | 7.69% | 14.39% |
| Single, no children | 10.69% | 6.55% | 12.73% |
| Divorced | 15.32% | 7.04% | 10.62% |
| Separated | 2.60% | 1.61% | 4.97% |
| Widowed | 8.26% | 7.84% | 6.14% |
| Now Married | 50.94% | 55.36% | 46.32% |
| Never Married | 22.88% | 28.14% | 31.95% |
