| | Sandusky, MI | Keystone Heights, FL | United States |
| Population | 2,676 | 1,489 | 329,725,481 |
| Female Population | 53.2% | 55.1% | 50.5% |
| Male Population | 46.8% | 44.9% | 49.5% |
| Median Age | 44.5 | 34.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,676 | 1,356 | 309,327,143 |
| Population - 2000 | 2,745 | 1,349 | 285,036,114 |
| Population - 1990 | 2,403 | 1,315 | 251,960,433 |
| Pop. 2000 to Now | -9.1% | 14.8% | 15.6% |
| Pop. 1990 to Now | 3.8% | 17.8% | 30.8% |
| space4 | | | |
| Population Density | 1,231.5 | 1,385.1 | 93.4 |
| Land Area | 2.2 | 1.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Sandusky, MI | Keystone Heights, FL | United States |
| Age 0 to 4 | 3.4% | 6.0% | 5.9% |
| Age 5 to 9 | 6.0% | 8.0% | 6.1% |
| Age 10 to 14 | 7.1% | 9.1% | 6.6% |
| Age 15 to 17 | 3.8% | 4.6% | 3.9% |
| Age 18 to 20 | 4.7% | 2.7% | 4.0% |
| Age 21 to 24 | 2.7% | 1.9% | 5.2% |
| Age 25 to 34 | 9.8% | 18.3% | 13.8% |
| Age 35 to 44 | 13.6% | 12.0% | 12.9% |
| Age 45 to 54 | 11.3% | 10.4% | 12.6% |
| Age 55 to 59 | 11.6% | 6.3% | 6.7% |
| Age 60 to 64 | 5.7% | 5.4% | 6.3% |
| Age 65 to 74 | 11.4% | 9.4% | 9.6% |
| Age 75 to 84 | 6.2% | 4.1% | 4.5% |
| Age 85 and over | 2.8% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Sandusky, MI | Keystone Heights, FL | United States |
| White | 87.9% | 80.2% | 59.4% |
| Black | 2.1% | 0.2% | 12.2% |
| Asian | 1.5% | 2.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 2.9% | 3.1% | 3.2% |
| Hispanic | 5.5% | 13.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Sandusky, MI | Keystone Heights, FL | United States |
| Married Population | 43.3% | 41.9% | 49.8% |
| Currently Married | 42.1% | 40.4% | 48.0% |
| Married but Separated | 1.2% | 1.5% | 1.8% |
| Single Population | 56.7% | 58.1% | 50.2% |
| Never Married | 32.7% | 30.9% | 33.8% |
| Divorced | 15.4% | 20.7% | 10.8% |
| Widowed | 8.6% | 6.5% | 5.6% |
| space5 | | | |
| Household Size | 2.18 | 2.71 | 2.60 |
| Households | 1,092 | 550 | 124,010,992 |
| Family Households | 616 | 365 | 80,755,759 |
| Married couple, w/children | 26.9% | 24.1% | 30.5% |
| Married couple, no children | 44.8% | 37.0% | 42.9% |
| Non Family Households | 476 | 185 | 43,255,233 |
| Single householder, w/children | 19.3% | 29.3% | 15.8% |
| Single householder, no children | 8.9% | 9.6% | 10.8% |