| | St. Ignace, MI | Munising, MI | United States |
| Population | 2,041 | 2,137 | 329,725,481 |
| Female Population | 49.6% | 49.2% | 50.5% |
| Male Population | 50.4% | 50.8% | 49.5% |
| Median Age | 49.1 | 46.8 | 38.4 |
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| Population - 2010 | 2,430 | 2,343 | 309,327,143 |
| Population - 2000 | 2,678 | 2,539 | 285,036,114 |
| Population - 1990 | 2,568 | 2,783 | 251,960,433 |
| Pop. 2000 to Now | -13.2% | -13.9% | 15.6% |
| Pop. 1990 to Now | -9.5% | -21.5% | 30.8% |
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| Population Density | 773.7 | 406.5 | 93.4 |
| Land Area | 2.6 | 5.3 | 3,531,905.4 |
| Water Area | 0.0 | 3.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | St. Ignace, MI | Munising, MI | United States |
| Age 0 to 4 | 4.2% | 5.9% | 5.9% |
| Age 5 to 9 | 3.3% | 6.4% | 6.1% |
| Age 10 to 14 | 5.4% | 2.6% | 6.6% |
| Age 15 to 17 | 2.3% | 4.4% | 3.9% |
| Age 18 to 20 | 2.3% | 2.0% | 4.0% |
| Age 21 to 24 | 6.2% | 3.5% | 5.2% |
| Age 25 to 34 | 12.1% | 13.1% | 13.8% |
| Age 35 to 44 | 10.5% | 11.2% | 12.9% |
| Age 45 to 54 | 9.4% | 12.2% | 12.6% |
| Age 55 to 59 | 12.9% | 11.3% | 6.7% |
| Age 60 to 64 | 9.4% | 6.5% | 6.3% |
| Age 65 to 74 | 9.6% | 9.0% | 9.6% |
| Age 75 to 84 | 9.1% | 7.8% | 4.5% |
| Age 85 and over | 3.3% | 4.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | St. Ignace, MI | Munising, MI | United States |
| White | 57.6% | 86.2% | 59.4% |
| Black | 5.1% | 0.6% | 12.2% |
| Asian | 1.9% | 0.0% | 5.6% |
| Native American | 28.3% | 3.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.6% | 0.6% | 0.4% |
| Two or More Races | 5.6% | 7.8% | 3.2% |
| Hispanic | 0.7% | 1.8% | 18.4% |
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| Marriage & Family | | | |
| | St. Ignace, MI | Munising, MI | United States |
| Married Population | 38.9% | 42.8% | 49.8% |
| Currently Married | 38.2% | 41.1% | 48.0% |
| Married but Separated | 0.7% | 1.7% | 1.8% |
| Single Population | 61.1% | 57.2% | 50.2% |
| Never Married | 35.9% | 31.1% | 33.8% |
| Divorced | 17.7% | 16.8% | 10.8% |
| Widowed | 7.5% | 9.3% | 5.6% |
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| Household Size | 1.91 | 2.36 | 2.60 |
| Households | 1,022 | 860 | 124,010,992 |
| Family Households | 488 | 439 | 80,755,759 |
| Married couple, w/children | 14.1% | 30.3% | 30.5% |
| Married couple, no children | 47.5% | 47.4% | 42.9% |
| Non Family Households | 534 | 421 | 43,255,233 |
| Single householder, w/children | 18.6% | 15.3% | 15.8% |
| Single householder, no children | 19.7% | 7.1% | 10.8% |