| | Mackinac Island, MI | Dowagiac, MI | United States |
| Population | 1,025 | 5,731 | 329,725,481 |
| Female Population | 47.0% | 50.2% | 50.5% |
| Male Population | 53.0% | 49.9% | 49.5% |
| Median Age | 43 | 37.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 492 | 5,864 | 309,327,143 |
| Population - 2000 | 523 | 6,147 | 285,036,114 |
| Population - 1990 | 469 | 6,409 | 251,960,433 |
| Pop. 2000 to Now | -8.6% | -9.5% | 15.6% |
| Pop. 1990 to Now | 1.9% | -13.2% | 30.8% |
| space4 | | | |
| Population Density | 235.5 | 1,287.0 | 93.4 |
| Land Area | 4.4 | 4.5 | 3,531,905.4 |
| Water Area | 14.5 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mackinac Island, MI | Dowagiac, MI | United States |
| Age 0 to 4 | 1.1% | 5.2% | 5.9% |
| Age 5 to 9 | 4.6% | 7.7% | 6.1% |
| Age 10 to 14 | 3.6% | 7.6% | 6.6% |
| Age 15 to 17 | 1.9% | 2.8% | 3.9% |
| Age 18 to 20 | 5.9% | 1.6% | 4.0% |
| Age 21 to 24 | 7.4% | 5.5% | 5.2% |
| Age 25 to 34 | 17.5% | 16.2% | 13.8% |
| Age 35 to 44 | 13.4% | 10.5% | 12.9% |
| Age 45 to 54 | 16.9% | 13.9% | 12.6% |
| Age 55 to 59 | 6.9% | 7.5% | 6.7% |
| Age 60 to 64 | 3.1% | 4.9% | 6.3% |
| Age 65 to 74 | 8.1% | 10.0% | 9.6% |
| Age 75 to 84 | 9.6% | 4.3% | 4.5% |
| Age 85 and over | 0.2% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mackinac Island, MI | Dowagiac, MI | United States |
| White | 53.6% | 73.3% | 59.4% |
| Black | 22.1% | 13.2% | 12.2% |
| Asian | 1.1% | 0.9% | 5.6% |
| Native American | 7.9% | 2.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.8% | 1.1% | 0.4% |
| Two or More Races | 7.8% | 3.3% | 3.2% |
| Hispanic | 5.8% | 6.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mackinac Island, MI | Dowagiac, MI | United States |
| Married Population | 34.9% | 28.5% | 49.8% |
| Currently Married | 34.1% | 26.4% | 48.0% |
| Married but Separated | 0.9% | 2.0% | 1.8% |
| Single Population | 65.1% | 71.5% | 50.2% |
| Never Married | 55.4% | 41.5% | 33.8% |
| Divorced | 8.0% | 22.8% | 10.8% |
| Widowed | 1.7% | 7.2% | 5.6% |
| space5 | | | |
| Household Size | 1.99 | 2.14 | 2.60 |
| Households | 424 | 2,658 | 124,010,992 |
| Family Households | 150 | 1,411 | 80,755,759 |
| Married couple, w/children | 22.0% | 15.0% | 30.5% |
| Married couple, no children | 49.3% | 24.6% | 42.9% |
| Non Family Households | 274 | 1,247 | 43,255,233 |
| Single householder, w/children | 17.3% | 43.3% | 15.8% |
| Single householder, no children | 11.3% | 17.1% | 10.8% |