| PEOPLE | Grinnell | Troy | United States |
| Population | 9,218 | 385 | 308,035,306 |
| Pop. Density | 1,647 | 1,209 | 87 |
| Pop. Change | -0.17% | -0.92% | 8.07% |
| Median Age | 35.6 | 39.3 | 37.3 |
| Households | 3,567 | 163 | 116,716,292 |
| Household Size | 2.18 | 2.5 | 2.58 |
| Male Population | 47.31% | 46.23% | 49.27% |
| Female Population | 52.69% | 53.77% | 50.96% |
| Married Population | 42.87% | 54.52% | 47.02% |
| Single Population | 57.13% | 45.48% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 5.12% | 6.49% | 6.56% |
| Age 5 to 9 | 5.39% | 7.53% | 6.61% |
| Age 10 to 14 | 5.11% | 7.27% | 6.71% |
| Age 15 to 17 | 3.38% | 2.08% | 4.21% |
| Age 18 to 20 | 7.05% | 1.56% | 2.95% |
| Age 21 to 24 | 14.38% | 7.27% | 7.01% |
| Age 25 to 34 | 8.97% | 12.21% | 13.33% |
| Age 35 to 44 | 9.49% | 11.43% | 13.33% |
| Age 45 to 49 | 11.73% | 15.84% | 14.61% |
| Age 50 to 54 | 11.73% | 15.84% | 14.61% |
| Age 55 to 59 | 10.25% | 13.77% | 11.84% |
| Age 60 to 64 | 10.25% | 13.77% | 11.84% |
| Age 65 to 74 | 7.77% | 9.35% | 7.05% |
| Age 75 to 84 | 6.91% | 3.90% | 4.24% |
| Age 85 and over | 4.44% | 1.30% | 1.78% |
| RACE | | | |
| White | 91.86% | 98.44% | 72.41% |
| Black | 1.97% | 0.00% | 12.61% |
| Asian | 2.67% | 0.00% | 4.75% |
| American Indian | 0.33% | 0.00% | 0.95% |
| Other | 3.17% | 1.56% | 9.28% |
| Hispanic | 1.14% | 5.13% | 16.35% |
| Non-Hispanic | 98.86% | 94.87% | 83.65% |
| FAMILY | | | |
| Married, w/children | 28.04% | 23.30% | 30.42% |
| Married, no children | 48.37% | 45.63% | 42.46% |
| Single, w/children | 17.13% | 16.50% | 14.39% |
| Single, no children | 6.47% | 14.56% | 12.73% |
| Divorced | 10.74% | 11.65% | 10.62% |
| Separated | 3.24% | 0.97% | 4.97% |
| Widowed | 7.99% | 7.12% | 6.14% |
| Now Married | 42.15% | 54.05% | 46.32% |
| Never Married | 35.88% | 26.21% | 31.95% |
