| | Middleville, MI | Dakota, IL | United States |
| Population | 4,178 | 677 | 329,725,481 |
| Female Population | 49.5% | 47.6% | 50.5% |
| Male Population | 50.5% | 52.4% | 49.5% |
| Median Age | 28.1 | 32.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,318 | 506 | 309,327,143 |
| Population - 2000 | 2,721 | 499 | 285,036,114 |
| Population - 1990 | 1,966 | 549 | 251,960,433 |
| Pop. 2000 to Now | 29.0% | -8.0% | 15.6% |
| Pop. 1990 to Now | 78.5% | -16.4% | 30.8% |
| space4 | | | |
| Population Density | 1,814.9 | 2,718.9 | 93.4 |
| Land Area | 2.3 | 0.2 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Middleville, MI | Dakota, IL | United States |
| Age 0 to 4 | 13.4% | 4.4% | 5.9% |
| Age 5 to 9 | 11.8% | 4.3% | 6.1% |
| Age 10 to 14 | 5.2% | 9.3% | 6.6% |
| Age 15 to 17 | 1.9% | 11.1% | 3.9% |
| Age 18 to 20 | 3.5% | 6.8% | 4.0% |
| Age 21 to 24 | 5.2% | 7.7% | 5.2% |
| Age 25 to 34 | 15.6% | 7.2% | 13.8% |
| Age 35 to 44 | 15.0% | 8.0% | 12.9% |
| Age 45 to 54 | 8.1% | 15.1% | 12.6% |
| Age 55 to 59 | 8.3% | 5.8% | 6.7% |
| Age 60 to 64 | 3.9% | 5.3% | 6.3% |
| Age 65 to 74 | 4.3% | 7.4% | 9.6% |
| Age 75 to 84 | 0.0% | 7.4% | 4.5% |
| Age 85 and over | 3.8% | 0.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Middleville, MI | Dakota, IL | United States |
| White | 86.2% | 97.0% | 59.4% |
| Black | 0.7% | 0.0% | 12.2% |
| Asian | 0.3% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 6.8% | 1.5% | 3.2% |
| Hispanic | 6.1% | 1.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Middleville, MI | Dakota, IL | United States |
| Married Population | 49.6% | 45.8% | 49.8% |
| Currently Married | 47.5% | 45.4% | 48.0% |
| Married but Separated | 2.1% | 0.4% | 1.8% |
| Single Population | 50.4% | 54.2% | 50.2% |
| Never Married | 20.8% | 43.8% | 33.8% |
| Divorced | 24.3% | 8.6% | 10.8% |
| Widowed | 5.3% | 1.8% | 5.6% |
| space5 | | | |
| Household Size | 2.44 | 3.18 | 2.60 |
| Households | 1,710 | 213 | 124,010,992 |
| Family Households | 968 | 181 | 80,755,759 |
| Married couple, w/children | 50.3% | 24.3% | 30.5% |
| Married couple, no children | 20.5% | 43.1% | 42.9% |
| Non Family Households | 742 | 32 | 43,255,233 |
| Single householder, w/children | 22.2% | 24.9% | 15.8% |
| Single householder, no children | 7.0% | 7.7% | 10.8% |