| | Lamberton, MN | Bethany, MO | United States |
| Population | 847 | 3,044 | 329,725,481 |
| Female Population | 53.0% | 55.0% | 50.5% |
| Male Population | 47.0% | 45.0% | 49.5% |
| Median Age | 43.5 | 44.4 | 38.4 |
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| Population - 2010 | 823 | 3,295 | 309,327,143 |
| Population - 2000 | 859 | 3,087 | 285,036,114 |
| Population - 1990 | 972 | 3,005 | 251,960,433 |
| Pop. 2000 to Now | -11.6% | -1.2% | 15.6% |
| Pop. 1990 to Now | -21.9% | 1.5% | 30.8% |
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| Population Density | 1,108.6 | 685.4 | 93.4 |
| Land Area | 0.8 | 4.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lamberton, MN | Bethany, MO | United States |
| Age 0 to 4 | 8.9% | 5.6% | 5.9% |
| Age 5 to 9 | 5.0% | 6.9% | 6.1% |
| Age 10 to 14 | 10.4% | 9.6% | 6.6% |
| Age 15 to 17 | 3.5% | 3.4% | 3.9% |
| Age 18 to 20 | 2.7% | 4.4% | 4.0% |
| Age 21 to 24 | 2.2% | 0.3% | 5.2% |
| Age 25 to 34 | 9.1% | 8.6% | 13.8% |
| Age 35 to 44 | 10.0% | 11.3% | 12.9% |
| Age 45 to 54 | 13.0% | 8.4% | 12.6% |
| Age 55 to 59 | 2.4% | 7.9% | 6.7% |
| Age 60 to 64 | 11.2% | 8.6% | 6.3% |
| Age 65 to 74 | 6.0% | 12.9% | 9.6% |
| Age 75 to 84 | 8.0% | 5.3% | 4.5% |
| Age 85 and over | 7.6% | 6.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lamberton, MN | Bethany, MO | United States |
| White | 91.7% | 91.7% | 59.4% |
| Black | 0.0% | 1.8% | 12.2% |
| Asian | 2.7% | 0.8% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.5% | 1.2% | 3.2% |
| Hispanic | 1.1% | 4.1% | 18.4% |
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| Marriage & Family | | | |
| | Lamberton, MN | Bethany, MO | United States |
| Married Population | 55.1% | 49.3% | 49.8% |
| Currently Married | 54.8% | 46.0% | 48.0% |
| Married but Separated | 0.3% | 3.2% | 1.8% |
| Single Population | 44.9% | 50.7% | 50.2% |
| Never Married | 23.5% | 20.6% | 33.8% |
| Divorced | 7.6% | 17.1% | 10.8% |
| Widowed | 13.7% | 13.0% | 5.6% |
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| Household Size | 2.41 | 2.43 | 2.60 |
| Households | 336 | 1,184 | 124,010,992 |
| Family Households | 208 | 693 | 80,755,759 |
| Married couple, w/children | 41.8% | 24.2% | 30.5% |
| Married couple, no children | 42.8% | 48.5% | 42.9% |
| Non Family Households | 128 | 491 | 43,255,233 |
| Single householder, w/children | 7.7% | 19.3% | 15.8% |
| Single householder, no children | 7.7% | 7.9% | 10.8% |