| | Le Sueur, MN | Montgomery, MN | United States |
| Population | 4,174 | 3,237 | 329,725,481 |
| Female Population | 51.7% | 52.2% | 50.5% |
| Male Population | 48.3% | 47.8% | 49.5% |
| Median Age | 38.7 | 37.2 | 38.4 |
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| Population - 2010 | 4,053 | 2,950 | 309,327,143 |
| Population - 2000 | 3,922 | 2,794 | 285,036,114 |
| Population - 1990 | 3,714 | 2,399 | 251,960,433 |
| Pop. 2000 to Now | 2.8% | 9.2% | 15.6% |
| Pop. 1990 to Now | 8.5% | 27.2% | 30.8% |
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| Population Density | 807.2 | 1,295.3 | 93.4 |
| Land Area | 5.2 | 2.5 | 3,531,905.4 |
| Water Area | 0.3 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Le Sueur, MN | Montgomery, MN | United States |
| Age 0 to 4 | 8.4% | 5.2% | 5.9% |
| Age 5 to 9 | 6.8% | 6.2% | 6.1% |
| Age 10 to 14 | 4.9% | 9.9% | 6.6% |
| Age 15 to 17 | 3.0% | 5.3% | 3.9% |
| Age 18 to 20 | 2.6% | 3.1% | 4.0% |
| Age 21 to 24 | 3.8% | 7.9% | 5.2% |
| Age 25 to 34 | 15.3% | 11.3% | 13.8% |
| Age 35 to 44 | 11.6% | 14.0% | 12.9% |
| Age 45 to 54 | 10.6% | 11.8% | 12.6% |
| Age 55 to 59 | 8.0% | 4.7% | 6.7% |
| Age 60 to 64 | 4.8% | 3.3% | 6.3% |
| Age 65 to 74 | 7.9% | 9.4% | 9.6% |
| Age 75 to 84 | 9.2% | 6.2% | 4.5% |
| Age 85 and over | 3.0% | 1.6% | 1.9% |
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| Race | | | |
| | Le Sueur, MN | Montgomery, MN | United States |
| White | 76.0% | 86.2% | 59.4% |
| Black | 2.4% | 1.9% | 12.2% |
| Asian | 0.3% | 0.0% | 5.6% |
| Native American | 0.0% | 1.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.8% | 0.4% |
| Two or More Races | 2.0% | 3.1% | 3.2% |
| Hispanic | 19.3% | 6.2% | 18.4% |
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| Marriage & Family | | | |
| | Le Sueur, MN | Montgomery, MN | United States |
| Married Population | 54.9% | 48.6% | 49.8% |
| Currently Married | 54.1% | 47.4% | 48.0% |
| Married but Separated | 0.8% | 1.2% | 1.8% |
| Single Population | 45.1% | 51.4% | 50.2% |
| Never Married | 23.3% | 34.1% | 33.8% |
| Divorced | 14.8% | 13.0% | 10.8% |
| Widowed | 7.0% | 4.4% | 5.6% |
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| Household Size | 2.28 | 2.32 | 2.60 |
| Households | 1,806 | 1,308 | 124,010,992 |
| Family Households | 1,209 | 795 | 80,755,759 |
| Married couple, w/children | 27.5% | 30.2% | 30.5% |
| Married couple, no children | 46.2% | 45.4% | 42.9% |
| Non Family Households | 597 | 513 | 43,255,233 |
| Single householder, w/children | 20.3% | 20.8% | 15.8% |
| Single householder, no children | 6.1% | 3.6% | 10.8% |