| | Detroit Lakes, MN | Mankato, MN | United States |
| Population | 9,717 | 43,938 | 329,725,481 |
| Female Population | 52.4% | 50.1% | 50.5% |
| Male Population | 47.6% | 49.9% | 49.5% |
| Median Age | 41 | 26.8 | 38.4 |
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| Population - 2010 | 8,723 | 39,932 | 309,327,143 |
| Population - 2000 | 7,348 | 32,427 | 285,036,114 |
| Population - 1990 | 6,635 | 31,477 | 251,960,433 |
| Pop. 2000 to Now | 26.0% | 34.0% | 15.6% |
| Pop. 1990 to Now | 39.5% | 38.0% | 30.8% |
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| Population Density | 873.9 | 2,302.6 | 93.4 |
| Land Area | 11.1 | 19.1 | 3,531,905.4 |
| Water Area | 5.0 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Detroit Lakes, MN | Mankato, MN | United States |
| Age 0 to 4 | 5.8% | 5.1% | 5.9% |
| Age 5 to 9 | 7.7% | 4.9% | 6.1% |
| Age 10 to 14 | 5.4% | 4.5% | 6.6% |
| Age 15 to 17 | 4.0% | 2.6% | 3.9% |
| Age 18 to 20 | 3.7% | 13.5% | 4.0% |
| Age 21 to 24 | 4.6% | 16.0% | 5.2% |
| Age 25 to 34 | 10.8% | 15.0% | 13.8% |
| Age 35 to 44 | 12.5% | 10.3% | 12.9% |
| Age 45 to 54 | 9.4% | 7.6% | 12.6% |
| Age 55 to 59 | 6.5% | 3.6% | 6.7% |
| Age 60 to 64 | 6.7% | 4.5% | 6.3% |
| Age 65 to 74 | 11.2% | 6.8% | 9.6% |
| Age 75 to 84 | 8.0% | 4.0% | 4.5% |
| Age 85 and over | 3.8% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Detroit Lakes, MN | Mankato, MN | United States |
| White | 91.6% | 83.5% | 59.4% |
| Black | 0.8% | 6.8% | 12.2% |
| Asian | 0.9% | 3.4% | 5.6% |
| Native American | 2.1% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.1% | 1.7% | 3.2% |
| Hispanic | 0.5% | 4.4% | 18.4% |
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| Marriage & Family | | | |
| | Detroit Lakes, MN | Mankato, MN | United States |
| Married Population | 46.8% | 34.1% | 49.8% |
| Currently Married | 45.9% | 33.4% | 48.0% |
| Married but Separated | 0.9% | 0.7% | 1.8% |
| Single Population | 53.2% | 65.9% | 50.2% |
| Never Married | 32.1% | 54.8% | 33.8% |
| Divorced | 12.2% | 7.6% | 10.8% |
| Widowed | 8.9% | 3.4% | 5.6% |
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| Household Size | 2.34 | 2.35 | 2.60 |
| Households | 4,015 | 17,196 | 124,010,992 |
| Family Households | 2,289 | 8,545 | 80,755,759 |
| Married couple, w/children | 25.0% | 28.5% | 30.5% |
| Married couple, no children | 52.8% | 40.7% | 42.9% |
| Non Family Households | 1,726 | 8,651 | 43,255,233 |
| Single householder, w/children | 19.6% | 18.0% | 15.8% |
| Single householder, no children | 2.6% | 12.8% | 10.8% |