| PEOPLE | Merrillville | Mesa | United States |
| Population | 35,246 | 439,041 | 308,035,306 |
| Pop. Density | 1,061 | 3,218 | 87 |
| Pop. Change | 15.75% | 5.44% | 8.07% |
| Median Age | 36.7 | 34.7 | 37.3 |
| Households | 13,696 | 165,374 | 116,716,292 |
| Household Size | 2.52 | 2.61 | 2.58 |
| Male Population | 46.99% | 49.18% | 49.27% |
| Female Population | 53.01% | 50.82% | 50.96% |
| Married Population | 47.00% | 45.75% | 47.02% |
| Single Population | 53.00% | 54.25% | 52.98% |
| ESTIMATED TOTAL POPULATION BY AGE | | | |
| Age 0 to 4 | 6.36% | 7.69% | 6.56% |
| Age 5 to 9 | 6.79% | 7.30% | 6.61% |
| Age 10 to 14 | 7.62% | 7.08% | 6.71% |
| Age 15 to 17 | 4.78% | 4.20% | 4.21% |
| Age 18 to 20 | 2.73% | 2.86% | 2.95% |
| Age 21 to 24 | 5.83% | 7.17% | 7.01% |
| Age 25 to 34 | 13.64% | 14.16% | 13.33% |
| Age 35 to 44 | 13.20% | 12.57% | 13.33% |
| Age 45 to 49 | 13.83% | 12.59% | 14.61% |
| Age 50 to 54 | 13.83% | 12.59% | 14.61% |
| Age 55 to 59 | 11.56% | 10.32% | 11.84% |
| Age 60 to 64 | 11.56% | 10.32% | 11.84% |
| Age 65 to 74 | 6.35% | 7.29% | 7.05% |
| Age 75 to 84 | 4.75% | 4.78% | 4.24% |
| Age 85 and over | 2.56% | 1.99% | 1.78% |
| RACE | | | |
| White | 46.35% | 77.12% | 72.41% |
| Black | 44.47% | 3.48% | 12.61% |
| Asian | 1.19% | 1.93% | 4.75% |
| American Indian | 0.20% | 2.36% | 0.95% |
| Other | 7.79% | 15.10% | 9.28% |
| Hispanic | 0.00% | 1.23% | 16.35% |
| Non-Hispanic | 100.00% | 98.77% | 83.65% |
| FAMILY | | | |
| Married, w/children | 25.84% | 30.03% | 30.42% |
| Married, no children | 38.39% | 42.05% | 42.46% |
| Single, w/children | 18.98% | 15.81% | 14.39% |
| Single, no children | 16.79% | 12.11% | 12.73% |
| Divorced | 11.53% | 12.01% | 10.62% |
| Separated | 3.88% | 4.25% | 4.97% |
| Widowed | 7.95% | 6.35% | 6.14% |
| Now Married | 46.94% | 46.13% | 46.32% |
| Never Married | 29.70% | 31.26% | 31.95% |
