| | Clarkfield, MN | Sleepy Eye, MN | United States |
| Population | 875 | 3,454 | 329,725,481 |
| Female Population | 55.8% | 49.0% | 50.5% |
| Male Population | 44.2% | 51.0% | 49.5% |
| Median Age | 33.4 | 40.9 | 38.4 |
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| Population - 2010 | 860 | 3,594 | 309,327,143 |
| Population - 2000 | 944 | 3,515 | 285,036,114 |
| Population - 1990 | 924 | 3,694 | 251,960,433 |
| Pop. 2000 to Now | -17.9% | -5.3% | 15.6% |
| Pop. 1990 to Now | -16.1% | -9.9% | 30.8% |
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| Population Density | 813.2 | 2,016.4 | 93.4 |
| Land Area | 1.1 | 1.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Clarkfield, MN | Sleepy Eye, MN | United States |
| Age 0 to 4 | 10.1% | 5.5% | 5.9% |
| Age 5 to 9 | 8.3% | 5.0% | 6.1% |
| Age 10 to 14 | 5.4% | 6.9% | 6.6% |
| Age 15 to 17 | 2.6% | 4.2% | 3.9% |
| Age 18 to 20 | 1.5% | 3.2% | 4.0% |
| Age 21 to 24 | 5.9% | 6.6% | 5.2% |
| Age 25 to 34 | 18.6% | 11.6% | 13.8% |
| Age 35 to 44 | 8.6% | 10.2% | 12.9% |
| Age 45 to 54 | 8.0% | 13.6% | 12.6% |
| Age 55 to 59 | 3.5% | 6.8% | 6.7% |
| Age 60 to 64 | 5.9% | 6.1% | 6.3% |
| Age 65 to 74 | 8.5% | 12.7% | 9.6% |
| Age 75 to 84 | 7.2% | 4.1% | 4.5% |
| Age 85 and over | 5.8% | 3.6% | 1.9% |
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| Race | | | |
| | Clarkfield, MN | Sleepy Eye, MN | United States |
| White | 86.3% | 83.5% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 1.7% | 0.0% | 5.6% |
| Native American | 3.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.7% | 0.2% | 3.2% |
| Hispanic | 5.9% | 16.3% | 18.4% |
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| Marriage & Family | | | |
| | Clarkfield, MN | Sleepy Eye, MN | United States |
| Married Population | 41.2% | 54.7% | 49.8% |
| Currently Married | 40.2% | 54.7% | 48.0% |
| Married but Separated | 1.0% | 0.0% | 1.8% |
| Single Population | 58.8% | 45.3% | 50.2% |
| Never Married | 29.4% | 25.6% | 33.8% |
| Divorced | 13.6% | 10.9% | 10.8% |
| Widowed | 15.7% | 8.8% | 5.6% |
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| Household Size | 2.36 | 2.35 | 2.60 |
| Households | 352 | 1,422 | 124,010,992 |
| Family Households | 202 | 1,000 | 80,755,759 |
| Married couple, w/children | 37.6% | 28.8% | 30.5% |
| Married couple, no children | 24.8% | 47.3% | 42.9% |
| Non Family Households | 150 | 422 | 43,255,233 |
| Single householder, w/children | 30.7% | 13.3% | 15.8% |
| Single householder, no children | 6.9% | 10.6% | 10.8% |