| | Isabella, MI | Iron Mountain, MI | United States |
| Population | 2,019 | 7,516 | 329,725,481 |
| Female Population | 50.3% | 46.4% | 50.5% |
| Male Population | 49.7% | 53.6% | 49.5% |
| Median Age | 43.7 | 43.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,252 | 7,630 | 309,327,143 |
| Population - 2000 | 2,145 | 8,154 | 285,036,114 |
| Population - 1990 | 2,025 | 8,525 | 251,960,433 |
| Pop. 2000 to Now | 5.8% | -10.9% | 15.6% |
| Pop. 1990 to Now | 12.1% | -14.7% | 30.8% |
| space4 | | | |
| Population Density | 55.6 | 996.3 | 93.4 |
| Land Area | 36.3 | 7.5 | 3,531,905.4 |
| Water Area | 0.1 | 0.7 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Isabella, MI | Iron Mountain, MI | United States |
| Age 0 to 4 | 5.7% | 5.1% | 5.9% |
| Age 5 to 9 | 5.2% | 6.4% | 6.1% |
| Age 10 to 14 | 7.0% | 5.1% | 6.6% |
| Age 15 to 17 | 4.6% | 2.9% | 3.9% |
| Age 18 to 20 | 4.8% | 3.2% | 4.0% |
| Age 21 to 24 | 3.6% | 2.8% | 5.2% |
| Age 25 to 34 | 12.1% | 13.2% | 13.8% |
| Age 35 to 44 | 9.0% | 12.7% | 12.9% |
| Age 45 to 54 | 17.6% | 13.0% | 12.6% |
| Age 55 to 59 | 9.4% | 8.1% | 6.7% |
| Age 60 to 64 | 7.1% | 7.9% | 6.3% |
| Age 65 to 74 | 9.1% | 11.1% | 9.6% |
| Age 75 to 84 | 3.8% | 4.7% | 4.5% |
| Age 85 and over | 1.1% | 3.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Isabella, MI | Iron Mountain, MI | United States |
| White | 91.1% | 93.1% | 59.4% |
| Black | 0.3% | 1.5% | 12.2% |
| Asian | 0.5% | 0.8% | 5.6% |
| Native American | 2.8% | 1.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.3% | 0.4% |
| Two or More Races | 1.8% | 0.9% | 3.2% |
| Hispanic | 3.4% | 1.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Isabella, MI | Iron Mountain, MI | United States |
| Married Population | 52.9% | 50.8% | 49.8% |
| Currently Married | 52.6% | 48.7% | 48.0% |
| Married but Separated | 0.2% | 2.2% | 1.8% |
| Single Population | 47.1% | 49.2% | 50.2% |
| Never Married | 29.1% | 28.7% | 33.8% |
| Divorced | 12.1% | 15.9% | 10.8% |
| Widowed | 5.9% | 4.5% | 5.6% |
| space5 | | | |
| Household Size | 2.50 | 2.23 | 2.60 |
| Households | 800 | 3,296 | 124,010,992 |
| Family Households | 580 | 2,009 | 80,755,759 |
| Married couple, w/children | 26.9% | 20.9% | 30.5% |
| Married couple, no children | 47.9% | 53.4% | 42.9% |
| Non Family Households | 220 | 1,287 | 43,255,233 |
| Single householder, w/children | 15.2% | 15.4% | 15.8% |
| Single householder, no children | 10.0% | 10.4% | 10.8% |