| | Humboldt, IA | Blue Springs, MO | United States |
| Population | 4,744 | 58,265 | 329,725,481 |
| Female Population | 51.2% | 51.7% | 50.5% |
| Male Population | 48.8% | 48.3% | 49.5% |
| Median Age | 42.1 | 36.4 | 38.4 |
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| Population - 2010 | 4,673 | 52,652 | 309,327,143 |
| Population - 2000 | 4,452 | 48,080 | 285,036,114 |
| Population - 1990 | 4,438 | 40,153 | 251,960,433 |
| Pop. 2000 to Now | 2.1% | 17.6% | 15.6% |
| Pop. 1990 to Now | 2.4% | 40.8% | 30.8% |
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| Population Density | 1,026.8 | 2,606.0 | 93.4 |
| Land Area | 4.6 | 22.4 | 3,531,905.4 |
| Water Area | 0.2 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Humboldt, IA | Blue Springs, MO | United States |
| Age 0 to 4 | 4.4% | 7.8% | 5.9% |
| Age 5 to 9 | 7.5% | 8.1% | 6.1% |
| Age 10 to 14 | 8.7% | 7.4% | 6.6% |
| Age 15 to 17 | 3.0% | 4.8% | 3.9% |
| Age 18 to 20 | 2.3% | 3.4% | 4.0% |
| Age 21 to 24 | 3.8% | 3.4% | 5.2% |
| Age 25 to 34 | 11.1% | 13.4% | 13.8% |
| Age 35 to 44 | 12.6% | 12.4% | 12.9% |
| Age 45 to 54 | 8.4% | 13.1% | 12.6% |
| Age 55 to 59 | 6.5% | 6.3% | 6.7% |
| Age 60 to 64 | 9.0% | 5.9% | 6.3% |
| Age 65 to 74 | 11.7% | 9.1% | 9.6% |
| Age 75 to 84 | 5.3% | 3.8% | 4.5% |
| Age 85 and over | 5.6% | 1.2% | 1.9% |
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| Race | | | |
| | Humboldt, IA | Blue Springs, MO | United States |
| White | 90.5% | 80.2% | 59.4% |
| Black | 0.1% | 7.9% | 12.2% |
| Asian | 1.8% | 1.4% | 5.6% |
| Native American | 0.1% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.0% | 3.0% | 3.2% |
| Hispanic | 7.6% | 7.2% | 18.4% |
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| Marriage & Family | | | |
| | Humboldt, IA | Blue Springs, MO | United States |
| Married Population | 54.2% | 57.8% | 49.8% |
| Currently Married | 52.2% | 56.1% | 48.0% |
| Married but Separated | 2.0% | 1.8% | 1.8% |
| Single Population | 45.8% | 42.2% | 50.2% |
| Never Married | 23.5% | 26.1% | 33.8% |
| Divorced | 11.7% | 12.0% | 10.8% |
| Widowed | 10.6% | 4.1% | 5.6% |
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| Household Size | 2.20 | 2.72 | 2.60 |
| Households | 2,108 | 21,354 | 124,010,992 |
| Family Households | 1,179 | 16,065 | 80,755,759 |
| Married couple, w/children | 30.6% | 34.1% | 30.5% |
| Married couple, no children | 48.6% | 41.3% | 42.9% |
| Non Family Households | 929 | 5,289 | 43,255,233 |
| Single householder, w/children | 14.8% | 17.6% | 15.8% |
| Single householder, no children | 6.0% | 7.0% | 10.8% |