| | Forest Lake, MN | Spring Lake, FL | United States |
| Population | 20,366 | 469 | 329,725,481 |
| Female Population | 51.5% | 52.5% | 50.5% |
| Male Population | 48.5% | 47.6% | 49.5% |
| Median Age | 38.6 | 54.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 18,447 | 480 | 309,327,143 |
| Population - 2000 | 6,798 | 327 | 285,036,114 |
| Population - 1990 | 5,833 | 313 | 251,960,433 |
| Pop. 2000 to Now | 213.1% | 84.7% | 15.6% |
| Pop. 1990 to Now | 264.9% | 93.0% | 30.8% |
| space4 | | | |
| Population Density | 666.9 | 140.8 | 93.4 |
| Land Area | 30.5 | 3.3 | 3,531,905.4 |
| Water Area | 5.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Forest Lake, MN | Spring Lake, FL | United States |
| Age 0 to 4 | 6.5% | 0.0% | 5.9% |
| Age 5 to 9 | 6.6% | 3.4% | 6.1% |
| Age 10 to 14 | 5.9% | 6.6% | 6.6% |
| Age 15 to 17 | 4.1% | 0.0% | 3.9% |
| Age 18 to 20 | 2.6% | 3.2% | 4.0% |
| Age 21 to 24 | 6.5% | 5.3% | 5.2% |
| Age 25 to 34 | 13.6% | 2.8% | 13.8% |
| Age 35 to 44 | 11.5% | 11.1% | 12.9% |
| Age 45 to 54 | 13.1% | 22.0% | 12.6% |
| Age 55 to 59 | 9.0% | 9.2% | 6.7% |
| Age 60 to 64 | 4.9% | 0.0% | 6.3% |
| Age 65 to 74 | 9.2% | 30.3% | 9.6% |
| Age 75 to 84 | 4.9% | 6.2% | 4.5% |
| Age 85 and over | 1.6% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Forest Lake, MN | Spring Lake, FL | United States |
| White | 84.6% | 81.2% | 59.4% |
| Black | 3.0% | 0.0% | 12.2% |
| Asian | 3.6% | 0.0% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 3.4% | 0.0% | 3.2% |
| Hispanic | 4.6% | 18.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Forest Lake, MN | Spring Lake, FL | United States |
| Married Population | 53.9% | 65.4% | 49.8% |
| Currently Married | 53.3% | 64.2% | 48.0% |
| Married but Separated | 0.6% | 1.2% | 1.8% |
| Single Population | 46.1% | 34.6% | 50.2% |
| Never Married | 30.4% | 16.1% | 33.8% |
| Divorced | 10.5% | 18.5% | 10.8% |
| Widowed | 5.2% | 0.0% | 5.6% |
| space5 | | | |
| Household Size | 2.52 | 2.58 | 2.60 |
| Households | 8,036 | 182 | 124,010,992 |
| Family Households | 5,458 | 172 | 80,755,759 |
| Married couple, w/children | 29.8% | 11.0% | 30.5% |
| Married couple, no children | 49.9% | 64.5% | 42.9% |
| Non Family Households | 2,578 | 10 | 43,255,233 |
| Single householder, w/children | 12.4% | 6.4% | 15.8% |
| Single householder, no children | 8.0% | 18.0% | 10.8% |