| | Humboldt, KS | Clinton, MO | United States |
| Population | 2,069 | 8,844 | 329,725,481 |
| Female Population | 51.7% | 53.2% | 50.5% |
| Male Population | 48.3% | 46.8% | 49.5% |
| Median Age | 45.9 | 41.7 | 38.4 |
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| Population - 2010 | 1,945 | 9,002 | 309,327,143 |
| Population - 2000 | 1,999 | 9,311 | 285,036,114 |
| Population - 1990 | 2,178 | 8,703 | 251,960,433 |
| Pop. 2000 to Now | -11.1% | -2.9% | 15.6% |
| Pop. 1990 to Now | -18.4% | 3.9% | 30.8% |
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| Population Density | 1,444.8 | 967.0 | 93.4 |
| Land Area | 1.4 | 9.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Humboldt, KS | Clinton, MO | United States |
| Age 0 to 4 | 10.2% | 6.2% | 5.9% |
| Age 5 to 9 | 4.0% | 5.5% | 6.1% |
| Age 10 to 14 | 7.2% | 5.7% | 6.6% |
| Age 15 to 17 | 3.2% | 4.6% | 3.9% |
| Age 18 to 20 | 3.8% | 2.9% | 4.0% |
| Age 21 to 24 | 3.7% | 3.6% | 5.2% |
| Age 25 to 34 | 5.6% | 11.4% | 13.8% |
| Age 35 to 44 | 11.7% | 14.1% | 12.9% |
| Age 45 to 54 | 10.4% | 9.3% | 12.6% |
| Age 55 to 59 | 9.5% | 7.1% | 6.7% |
| Age 60 to 64 | 7.0% | 7.1% | 6.3% |
| Age 65 to 74 | 15.2% | 13.5% | 9.6% |
| Age 75 to 84 | 5.2% | 5.5% | 4.5% |
| Age 85 and over | 3.3% | 3.5% | 1.9% |
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| Race | | | |
| | Humboldt, KS | Clinton, MO | United States |
| White | 93.2% | 91.6% | 59.4% |
| Black | 0.7% | 2.0% | 12.2% |
| Asian | 2.0% | 0.4% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.1% | 3.7% | 3.2% |
| Hispanic | 3.0% | 2.1% | 18.4% |
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| Marriage & Family | | | |
| | Humboldt, KS | Clinton, MO | United States |
| Married Population | 45.7% | 41.9% | 49.8% |
| Currently Married | 44.2% | 40.2% | 48.0% |
| Married but Separated | 1.5% | 1.7% | 1.8% |
| Single Population | 54.3% | 58.1% | 50.2% |
| Never Married | 22.6% | 28.5% | 33.8% |
| Divorced | 16.8% | 19.6% | 10.8% |
| Widowed | 14.9% | 10.0% | 5.6% |
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| Household Size | 2.62 | 2.24 | 2.60 |
| Households | 783 | 3,858 | 124,010,992 |
| Family Households | 499 | 2,177 | 80,755,759 |
| Married couple, w/children | 24.4% | 21.4% | 30.5% |
| Married couple, no children | 38.1% | 38.5% | 42.9% |
| Non Family Households | 284 | 1,681 | 43,255,233 |
| Single householder, w/children | 20.0% | 33.2% | 15.8% |
| Single householder, no children | 17.4% | 6.9% | 10.8% |