| | Vermillion, SD | Mankato, MN | United States |
| Population | 11,506 | 43,938 | 329,725,481 |
| Female Population | 51.1% | 50.1% | 50.5% |
| Male Population | 48.9% | 49.9% | 49.5% |
| Median Age | 23 | 26.8 | 38.4 |
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| Population - 2010 | 10,554 | 39,932 | 309,327,143 |
| Population - 2000 | 9,765 | 32,427 | 285,036,114 |
| Population - 1990 | 10,034 | 31,477 | 251,960,433 |
| Pop. 2000 to Now | 13.0% | 34.0% | 15.6% |
| Pop. 1990 to Now | 10.0% | 38.0% | 30.8% |
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| Population Density | 2,519.4 | 2,302.6 | 93.4 |
| Land Area | 4.6 | 19.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Vermillion, SD | Mankato, MN | United States |
| Age 0 to 4 | 5.3% | 5.1% | 5.9% |
| Age 5 to 9 | 4.1% | 4.9% | 6.1% |
| Age 10 to 14 | 5.6% | 4.5% | 6.6% |
| Age 15 to 17 | 1.7% | 2.6% | 3.9% |
| Age 18 to 20 | 23.2% | 13.5% | 4.0% |
| Age 21 to 24 | 16.9% | 16.0% | 5.2% |
| Age 25 to 34 | 12.8% | 15.0% | 13.8% |
| Age 35 to 44 | 8.1% | 10.3% | 12.9% |
| Age 45 to 54 | 5.6% | 7.6% | 12.6% |
| Age 55 to 59 | 1.8% | 3.6% | 6.7% |
| Age 60 to 64 | 5.7% | 4.5% | 6.3% |
| Age 65 to 74 | 5.9% | 6.8% | 9.6% |
| Age 75 to 84 | 1.7% | 4.0% | 4.5% |
| Age 85 and over | 1.4% | 1.5% | 1.9% |
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| Race | | | |
| | Vermillion, SD | Mankato, MN | United States |
| White | 83.8% | 83.5% | 59.4% |
| Black | 2.0% | 6.8% | 12.2% |
| Asian | 3.6% | 3.4% | 5.6% |
| Native American | 4.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.5% | 0.0% | 0.4% |
| Two or More Races | 2.3% | 1.7% | 3.2% |
| Hispanic | 3.6% | 4.4% | 18.4% |
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| Marriage & Family | | | |
| | Vermillion, SD | Mankato, MN | United States |
| Married Population | 30.2% | 34.1% | 49.8% |
| Currently Married | 30.2% | 33.4% | 48.0% |
| Married but Separated | 0.0% | 0.7% | 1.8% |
| Single Population | 69.8% | 65.9% | 50.2% |
| Never Married | 61.2% | 54.8% | 33.8% |
| Divorced | 5.4% | 7.6% | 10.8% |
| Widowed | 3.2% | 3.4% | 5.6% |
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| Household Size | 2.31 | 2.35 | 2.60 |
| Households | 3,964 | 17,196 | 124,010,992 |
| Family Households | 1,734 | 8,545 | 80,755,759 |
| Married couple, w/children | 28.8% | 28.5% | 30.5% |
| Married couple, no children | 52.9% | 40.7% | 42.9% |
| Non Family Households | 2,230 | 8,651 | 43,255,233 |
| Single householder, w/children | 15.4% | 18.0% | 15.8% |
| Single householder, no children | 2.9% | 12.8% | 10.8% |