| | Lake City, MN | Harmony, MN | United States |
| Population | 5,120 | 989 | 329,725,481 |
| Female Population | 49.9% | 53.2% | 50.5% |
| Male Population | 50.1% | 46.8% | 49.5% |
| Median Age | 50.1 | 57.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,062 | 1,019 | 309,327,143 |
| Population - 2000 | 4,950 | 1,080 | 285,036,114 |
| Population - 1990 | 4,391 | 1,081 | 251,960,433 |
| Pop. 2000 to Now | 3.3% | -9.1% | 15.6% |
| Pop. 1990 to Now | 16.5% | -9.2% | 30.8% |
| space4 | | | |
| Population Density | 1,143.1 | 887.0 | 93.4 |
| Land Area | 4.5 | 1.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lake City, MN | Harmony, MN | United States |
| Age 0 to 4 | 3.9% | 2.7% | 5.9% |
| Age 5 to 9 | 4.2% | 4.8% | 6.1% |
| Age 10 to 14 | 7.8% | 7.3% | 6.6% |
| Age 15 to 17 | 3.5% | 2.1% | 3.9% |
| Age 18 to 20 | 2.2% | 0.3% | 4.0% |
| Age 21 to 24 | 2.5% | 2.2% | 5.2% |
| Age 25 to 34 | 10.3% | 10.0% | 13.8% |
| Age 35 to 44 | 8.9% | 6.4% | 12.9% |
| Age 45 to 54 | 14.4% | 12.2% | 12.6% |
| Age 55 to 59 | 6.3% | 6.7% | 6.7% |
| Age 60 to 64 | 7.8% | 6.6% | 6.3% |
| Age 65 to 74 | 13.3% | 17.6% | 9.6% |
| Age 75 to 84 | 9.8% | 10.0% | 4.5% |
| Age 85 and over | 5.0% | 11.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lake City, MN | Harmony, MN | United States |
| White | 91.4% | 96.9% | 59.4% |
| Black | 1.5% | 1.3% | 12.2% |
| Asian | 2.3% | 0.0% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.5% | 0.0% | 0.4% |
| Two or More Races | 0.7% | 1.2% | 3.2% |
| Hispanic | 3.5% | 0.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lake City, MN | Harmony, MN | United States |
| Married Population | 54.3% | 49.2% | 49.8% |
| Currently Married | 53.8% | 49.2% | 48.0% |
| Married but Separated | 0.5% | 0.0% | 1.8% |
| Single Population | 45.7% | 50.8% | 50.2% |
| Never Married | 21.5% | 21.6% | 33.8% |
| Divorced | 15.6% | 12.7% | 10.8% |
| Widowed | 8.6% | 16.5% | 5.6% |
| space5 | | | |
| Household Size | 2.16 | 1.87 | 2.60 |
| Households | 2,315 | 500 | 124,010,992 |
| Family Households | 1,396 | 252 | 80,755,759 |
| Married couple, w/children | 25.6% | 19.4% | 30.5% |
| Married couple, no children | 53.8% | 60.3% | 42.9% |
| Non Family Households | 919 | 248 | 43,255,233 |
| Single householder, w/children | 11.3% | 15.5% | 15.8% |
| Single householder, no children | 9.3% | 4.8% | 10.8% |