| PEOPLE | Cassopolis | Marion | United States |
| Population | 1,774 | 29,948 | 308,035,306 |
| Pop. Density | 888 | 1,906 | 87 |
| Pop. Change | -3.29% | -8.47% | 8.07% |
| Median Age | 35.3 | 36.2 | 37.3 |
| Households | 709 | 11,828 | 116,716,292 |
| Household Size | 2.3 | 2.26 | 2.58 |
| Male Population | 50.34% | 47.03% | 49.27% |
| Female Population | 49.66% | 52.97% | 50.96% |
| Married Population | 45.10% | 38.98% | 47.02% |
| Single Population | 54.90% | 61.02% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 7.78% | 6.43% | 6.56% |
| Age 5 to 9 | 6.43% | 5.53% | 6.61% |
| Age 10 to 14 | 6.37% | 5.50% | 6.71% |
| Age 15 to 17 | 4.96% | 3.61% | 4.21% |
| Age 18 to 20 | 2.71% | 5.17% | 2.95% |
| Age 21 to 24 | 7.67% | 11.16% | 7.01% |
| Age 25 to 34 | 13.64% | 11.27% | 13.33% |
| Age 35 to 44 | 14.37% | 10.75% | 13.33% |
| Age 45 to 49 | 13.53% | 13.20% | 14.61% |
| Age 50 to 54 | 13.53% | 13.20% | 14.61% |
| Age 55 to 59 | 9.19% | 11.38% | 11.84% |
| Age 60 to 64 | 9.19% | 11.38% | 11.84% |
| Age 65 to 74 | 7.84% | 7.68% | 7.05% |
| Age 75 to 84 | 4.28% | 5.59% | 4.24% |
| Age 85 and over | 1.24% | 2.72% | 1.78% |
| RACE | | | |
| White | 59.98% | 78.14% | 72.41% |
| Black | 29.26% | 14.71% | 12.61% |
| Asian | 2.42% | 0.74% | 4.75% |
| American Indian | 1.13% | 0.36% | 0.95% |
| Other | 7.22% | 6.05% | 9.28% |
| Hispanic | 0.77% | 4.11% | 16.35% |
| Non-Hispanic | 99.23% | 95.89% | 83.65% |
| FAMILY | | | |
| Married, w/children | 27.34% | 19.13% | 30.42% |
| Married, no children | 30.73% | 42.59% | 42.46% |
| Single, w/children | 26.56% | 22.21% | 14.39% |
| Single, no children | 15.36% | 16.07% | 12.73% |
| Divorced | 11.68% | 15.40% | 10.62% |
| Separated | 2.18% | 3.99% | 4.97% |
| Widowed | 8.14% | 9.15% | 6.14% |
| Now Married | 45.77% | 39.47% | 46.32% |
| Never Married | 32.23% | 31.98% | 31.95% |
