| | Gem Lake, MN | Willernie, MN | United States |
| Population | 500 | 539 | 329,725,481 |
| Female Population | 55.6% | 51.8% | 50.5% |
| Male Population | 44.4% | 48.2% | 49.5% |
| Median Age | 41.9 | 37.7 | 38.4 |
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| Population - 2010 | 394 | 503 | 309,327,143 |
| Population - 2000 | 419 | 549 | 285,036,114 |
| Population - 1990 | 439 | 584 | 251,960,433 |
| Pop. 2000 to Now | 27.9% | -7.8% | 15.6% |
| Pop. 1990 to Now | 22.1% | -13.4% | 30.8% |
| space4 | | | |
| Population Density | 476.6 | 4,312.0 | 93.4 |
| Land Area | 1.0 | 0.1 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Gem Lake, MN | Willernie, MN | United States |
| Age 0 to 4 | 9.4% | 0.0% | 5.9% |
| Age 5 to 9 | 9.0% | 3.5% | 6.1% |
| Age 10 to 14 | 5.6% | 7.1% | 6.6% |
| Age 15 to 17 | 2.8% | 8.3% | 3.9% |
| Age 18 to 20 | 1.0% | 6.1% | 4.0% |
| Age 21 to 24 | 3.0% | 5.4% | 5.2% |
| Age 25 to 34 | 9.0% | 16.7% | 13.8% |
| Age 35 to 44 | 13.2% | 13.0% | 12.9% |
| Age 45 to 54 | 7.0% | 18.2% | 12.6% |
| Age 55 to 59 | 6.0% | 5.8% | 6.7% |
| Age 60 to 64 | 12.8% | 4.5% | 6.3% |
| Age 65 to 74 | 9.6% | 7.2% | 9.6% |
| Age 75 to 84 | 9.0% | 4.3% | 4.5% |
| Age 85 and over | 2.6% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Gem Lake, MN | Willernie, MN | United States |
| White | 95.4% | 93.0% | 59.4% |
| Black | 0.0% | 1.7% | 12.2% |
| Asian | 2.8% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 0.0% | 3.2% |
| Hispanic | 0.0% | 5.4% | 18.4% |
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| Marriage & Family | | | |
| | Gem Lake, MN | Willernie, MN | United States |
| Married Population | 74.7% | 32.6% | 49.8% |
| Currently Married | 74.2% | 31.1% | 48.0% |
| Married but Separated | 0.5% | 1.5% | 1.8% |
| Single Population | 25.3% | 67.4% | 50.2% |
| Never Married | 14.7% | 43.8% | 33.8% |
| Divorced | 6.1% | 21.0% | 10.8% |
| Widowed | 4.5% | 2.7% | 5.6% |
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| Household Size | 2.87 | 2.48 | 2.60 |
| Households | 174 | 217 | 124,010,992 |
| Family Households | 147 | 159 | 80,755,759 |
| Married couple, w/children | 36.7% | 8.8% | 30.5% |
| Married couple, no children | 55.8% | 38.4% | 42.9% |
| Non Family Households | 27 | 58 | 43,255,233 |
| Single householder, w/children | 2.7% | 43.4% | 15.8% |
| Single householder, no children | 4.8% | 9.4% | 10.8% |