| | Winthrop, MN | Mankato, MN | United States |
| Population | 1,380 | 43,938 | 329,725,481 |
| Female Population | 48.8% | 50.1% | 50.5% |
| Male Population | 51.2% | 49.9% | 49.5% |
| Median Age | 39.1 | 26.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,409 | 39,932 | 309,327,143 |
| Population - 2000 | 1,367 | 32,427 | 285,036,114 |
| Population - 1990 | 1,279 | 31,477 | 251,960,433 |
| Pop. 2000 to Now | -3.2% | 34.0% | 15.6% |
| Pop. 1990 to Now | 3.4% | 38.0% | 30.8% |
| space4 | | | |
| Population Density | 1,170.5 | 2,302.6 | 93.4 |
| Land Area | 1.2 | 19.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Winthrop, MN | Mankato, MN | United States |
| Age 0 to 4 | 5.7% | 5.1% | 5.9% |
| Age 5 to 9 | 8.3% | 4.9% | 6.1% |
| Age 10 to 14 | 3.8% | 4.5% | 6.6% |
| Age 15 to 17 | 5.1% | 2.6% | 3.9% |
| Age 18 to 20 | 1.7% | 13.5% | 4.0% |
| Age 21 to 24 | 3.6% | 16.0% | 5.2% |
| Age 25 to 34 | 17.0% | 15.0% | 13.8% |
| Age 35 to 44 | 13.7% | 10.3% | 12.9% |
| Age 45 to 54 | 8.3% | 7.6% | 12.6% |
| Age 55 to 59 | 3.6% | 3.6% | 6.7% |
| Age 60 to 64 | 5.6% | 4.5% | 6.3% |
| Age 65 to 74 | 8.9% | 6.8% | 9.6% |
| Age 75 to 84 | 9.9% | 4.0% | 4.5% |
| Age 85 and over | 4.9% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Winthrop, MN | Mankato, MN | United States |
| White | 85.7% | 83.5% | 59.4% |
| Black | 1.7% | 6.8% | 12.2% |
| Asian | 0.8% | 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 | 2.0% | 1.7% | 3.2% |
| Hispanic | 7.7% | 4.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Winthrop, MN | Mankato, MN | United States |
| Married Population | 47.4% | 34.1% | 49.8% |
| Currently Married | 47.4% | 33.4% | 48.0% |
| Married but Separated | 0.0% | 0.7% | 1.8% |
| Single Population | 52.6% | 65.9% | 50.2% |
| Never Married | 29.8% | 54.8% | 33.8% |
| Divorced | 11.6% | 7.6% | 10.8% |
| Widowed | 11.1% | 3.4% | 5.6% |
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| Household Size | 2.21 | 2.35 | 2.60 |
| Households | 611 | 17,196 | 124,010,992 |
| Family Households | 323 | 8,545 | 80,755,759 |
| Married couple, w/children | 29.1% | 28.5% | 30.5% |
| Married couple, no children | 51.4% | 40.7% | 42.9% |
| Non Family Households | 288 | 8,651 | 43,255,233 |
| Single householder, w/children | 16.7% | 18.0% | 15.8% |
| Single householder, no children | 2.8% | 12.8% | 10.8% |