| | St. Charles, MI | Clearwater, FL | United States |
| Population | 2,073 | 116,616 | 329,725,481 |
| Female Population | 51.3% | 51.2% | 50.5% |
| Male Population | 48.7% | 48.8% | 49.5% |
| Median Age | 40.1 | 45.8 | 38.4 |
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| Population - 2010 | 2,046 | 109,005 | 309,327,143 |
| Population - 2000 | 2,215 | 108,787 | 285,036,114 |
| Population - 1990 | 2,144 | 98,784 | 251,960,433 |
| Pop. 2000 to Now | -14.9% | 7.1% | 15.6% |
| Pop. 1990 to Now | -12.0% | 18.0% | 30.8% |
| space4 | | | |
| Population Density | 992.3 | 4,487.3 | 93.4 |
| Land Area | 2.1 | 26.0 | 3,531,905.4 |
| Water Area | 0.1 | 9.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | St. Charles, MI | Clearwater, FL | United States |
| Age 0 to 4 | 5.3% | 4.8% | 5.9% |
| Age 5 to 9 | 5.5% | 4.8% | 6.1% |
| Age 10 to 14 | 7.3% | 5.3% | 6.6% |
| Age 15 to 17 | 5.8% | 3.0% | 3.9% |
| Age 18 to 20 | 2.9% | 2.5% | 4.0% |
| Age 21 to 24 | 3.9% | 3.9% | 5.2% |
| Age 25 to 34 | 14.8% | 12.7% | 13.8% |
| Age 35 to 44 | 6.3% | 11.9% | 12.9% |
| Age 45 to 54 | 18.4% | 13.4% | 12.6% |
| Age 55 to 59 | 6.9% | 8.1% | 6.7% |
| Age 60 to 64 | 5.5% | 6.7% | 6.3% |
| Age 65 to 74 | 12.8% | 12.9% | 9.6% |
| Age 75 to 84 | 3.1% | 6.1% | 4.5% |
| Age 85 and over | 1.4% | 4.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | St. Charles, MI | Clearwater, FL | United States |
| White | 84.7% | 65.3% | 59.4% |
| Black | 0.1% | 11.9% | 12.2% |
| Asian | 0.5% | 3.1% | 5.6% |
| Native American | 0.3% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 2.5% | 2.3% | 3.2% |
| Hispanic | 11.9% | 17.1% | 18.4% |
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| Marriage & Family | | | |
| | St. Charles, MI | Clearwater, FL | United States |
| Married Population | 49.6% | 45.3% | 49.8% |
| Currently Married | 49.3% | 43.7% | 48.0% |
| Married but Separated | 0.4% | 1.7% | 1.8% |
| Single Population | 50.4% | 54.7% | 50.2% |
| Never Married | 33.2% | 31.4% | 33.8% |
| Divorced | 12.3% | 15.1% | 10.8% |
| Widowed | 4.9% | 8.1% | 5.6% |
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| Household Size | 2.47 | 2.30 | 2.60 |
| Households | 828 | 49,574 | 124,010,992 |
| Family Households | 593 | 27,923 | 80,755,759 |
| Married couple, w/children | 31.9% | 20.7% | 30.5% |
| Married couple, no children | 36.8% | 50.4% | 42.9% |
| Non Family Households | 235 | 21,651 | 43,255,233 |
| Single householder, w/children | 9.9% | 16.3% | 15.8% |
| Single householder, no children | 21.4% | 12.5% | 10.8% |