| | Marshall, MI | Flat Rock, MI | United States |
| Population | 6,832 | 10,439 | 329,725,481 |
| Female Population | 51.6% | 49.1% | 50.5% |
| Male Population | 48.4% | 50.9% | 49.5% |
| Median Age | 45.4 | 36.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,058 | 9,868 | 309,327,143 |
| Population - 2000 | 7,459 | 8,488 | 285,036,114 |
| Population - 1990 | 6,891 | 7,290 | 251,960,433 |
| Pop. 2000 to Now | -7.2% | 17.3% | 15.6% |
| Pop. 1990 to Now | 0.5% | 36.6% | 30.8% |
| space4 | | | |
| Population Density | 1,074.0 | 1,594.7 | 93.4 |
| Land Area | 6.4 | 6.5 | 3,531,905.4 |
| Water Area | 0.1 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Marshall, MI | Flat Rock, MI | United States |
| Age 0 to 4 | 5.3% | 5.7% | 5.9% |
| Age 5 to 9 | 5.4% | 7.4% | 6.1% |
| Age 10 to 14 | 4.7% | 8.0% | 6.6% |
| Age 15 to 17 | 3.4% | 5.7% | 3.9% |
| Age 18 to 20 | 3.0% | 2.7% | 4.0% |
| Age 21 to 24 | 2.9% | 5.2% | 5.2% |
| Age 25 to 34 | 13.6% | 12.4% | 13.8% |
| Age 35 to 44 | 11.3% | 15.4% | 12.9% |
| Age 45 to 54 | 14.3% | 11.3% | 12.6% |
| Age 55 to 59 | 7.5% | 7.5% | 6.7% |
| Age 60 to 64 | 6.4% | 7.3% | 6.3% |
| Age 65 to 74 | 12.9% | 9.1% | 9.6% |
| Age 75 to 84 | 6.4% | 1.3% | 4.5% |
| Age 85 and over | 3.0% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Marshall, MI | Flat Rock, MI | United States |
| White | 94.3% | 77.7% | 59.4% |
| Black | 0.5% | 10.1% | 12.2% |
| Asian | 0.4% | 0.1% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.2% | 3.2% | 3.2% |
| Hispanic | 3.6% | 8.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Marshall, MI | Flat Rock, MI | United States |
| Married Population | 48.8% | 48.5% | 49.8% |
| Currently Married | 47.0% | 47.0% | 48.0% |
| Married but Separated | 1.7% | 1.5% | 1.8% |
| Single Population | 51.2% | 51.5% | 50.2% |
| Never Married | 26.7% | 37.0% | 33.8% |
| Divorced | 15.9% | 10.1% | 10.8% |
| Widowed | 8.6% | 4.4% | 5.6% |
| space5 | | | |
| Household Size | 2.08 | 2.79 | 2.60 |
| Households | 3,236 | 3,738 | 124,010,992 |
| Family Households | 1,770 | 2,746 | 80,755,759 |
| Married couple, w/children | 23.7% | 31.0% | 30.5% |
| Married couple, no children | 52.0% | 37.1% | 42.9% |
| Non Family Households | 1,466 | 992 | 43,255,233 |
| Single householder, w/children | 15.7% | 20.9% | 15.8% |
| Single householder, no children | 8.6% | 11.0% | 10.8% |