| | Hart, MI | Huntley, IL | United States |
| Population | 2,193 | 27,314 | 329,725,481 |
| Female Population | 46.3% | 51.5% | 50.5% |
| Male Population | 53.7% | 48.5% | 49.5% |
| Median Age | 37.3 | 48.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,106 | 24,373 | 309,327,143 |
| Population - 2000 | 1,950 | 5,730 | 285,036,114 |
| Population - 1990 | 1,942 | 2,453 | 251,960,433 |
| Pop. 2000 to Now | 7.1% | 375.7% | 15.6% |
| Pop. 1990 to Now | 7.6% | 1,011.1% | 30.8% |
| space4 | | | |
| Population Density | 1,564.2 | 1,906.3 | 93.4 |
| Land Area | 1.4 | 14.3 | 3,531,905.4 |
| Water Area | 0.2 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hart, MI | Huntley, IL | United States |
| Age 0 to 4 | 6.5% | 4.1% | 5.9% |
| Age 5 to 9 | 5.7% | 7.1% | 6.1% |
| Age 10 to 14 | 9.9% | 4.2% | 6.6% |
| Age 15 to 17 | 4.9% | 5.5% | 3.9% |
| Age 18 to 20 | 3.7% | 2.5% | 4.0% |
| Age 21 to 24 | 3.3% | 3.1% | 5.2% |
| Age 25 to 34 | 14.5% | 7.3% | 13.8% |
| Age 35 to 44 | 12.2% | 11.0% | 12.9% |
| Age 45 to 54 | 9.5% | 12.7% | 12.6% |
| Age 55 to 59 | 8.7% | 4.4% | 6.7% |
| Age 60 to 64 | 4.2% | 4.5% | 6.3% |
| Age 65 to 74 | 7.9% | 13.5% | 9.6% |
| Age 75 to 84 | 5.1% | 16.4% | 4.5% |
| Age 85 and over | 3.8% | 3.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hart, MI | Huntley, IL | United States |
| White | 70.9% | 79.0% | 59.4% |
| Black | 2.5% | 4.6% | 12.2% |
| Asian | 0.0% | 5.4% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 1.9% | 3.2% |
| Hispanic | 25.5% | 9.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hart, MI | Huntley, IL | United States |
| Married Population | 38.6% | 55.5% | 49.8% |
| Currently Married | 37.1% | 54.9% | 48.0% |
| Married but Separated | 1.5% | 0.6% | 1.8% |
| Single Population | 61.4% | 44.5% | 50.2% |
| Never Married | 32.4% | 23.0% | 33.8% |
| Divorced | 22.1% | 10.5% | 10.8% |
| Widowed | 6.9% | 11.0% | 5.6% |
| space5 | | | |
| Household Size | 2.59 | 2.34 | 2.60 |
| Households | 781 | 11,691 | 124,010,992 |
| Family Households | 482 | 7,246 | 80,755,759 |
| Married couple, w/children | 28.8% | 32.9% | 30.5% |
| Married couple, no children | 34.0% | 52.5% | 42.9% |
| Non Family Households | 299 | 4,445 | 43,255,233 |
| Single householder, w/children | 33.2% | 10.0% | 15.8% |
| Single householder, no children | 3.9% | 4.6% | 10.8% |