| | West Liberty, IA | Denver, IA | United States |
| Population | 3,847 | 1,873 | 329,725,481 |
| Female Population | 50.7% | 53.1% | 50.5% |
| Male Population | 49.3% | 46.9% | 49.5% |
| Median Age | 32.5 | 36.6 | 38.4 |
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| Population - 2010 | 3,752 | 1,767 | 309,327,143 |
| Population - 2000 | 3,332 | 1,627 | 285,036,114 |
| Population - 1990 | 2,935 | 1,600 | 251,960,433 |
| Pop. 2000 to Now | 12.1% | 15.5% | 15.6% |
| Pop. 1990 to Now | 27.2% | 17.4% | 30.8% |
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| Population Density | 2,210.9 | 1,196.0 | 93.4 |
| Land Area | 1.7 | 1.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | West Liberty, IA | Denver, IA | United States |
| Age 0 to 4 | 5.1% | 8.1% | 5.9% |
| Age 5 to 9 | 10.0% | 9.5% | 6.1% |
| Age 10 to 14 | 5.7% | 8.0% | 6.6% |
| Age 15 to 17 | 6.8% | 3.6% | 3.9% |
| Age 18 to 20 | 4.9% | 2.5% | 4.0% |
| Age 21 to 24 | 6.1% | 3.9% | 5.2% |
| Age 25 to 34 | 18.0% | 11.6% | 13.8% |
| Age 35 to 44 | 13.7% | 14.9% | 12.9% |
| Age 45 to 54 | 9.8% | 10.9% | 12.6% |
| Age 55 to 59 | 3.6% | 5.6% | 6.7% |
| Age 60 to 64 | 5.0% | 5.0% | 6.3% |
| Age 65 to 74 | 6.1% | 8.9% | 9.6% |
| Age 75 to 84 | 2.1% | 5.4% | 4.5% |
| Age 85 and over | 3.2% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | West Liberty, IA | Denver, IA | United States |
| White | 44.2% | 96.9% | 59.4% |
| Black | 4.7% | 0.0% | 12.2% |
| Asian | 0.7% | 0.5% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.2% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 2.0% | 3.2% |
| Hispanic | 48.5% | 0.7% | 18.4% |
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| Marriage & Family | | | |
| | West Liberty, IA | Denver, IA | United States |
| Married Population | 42.7% | 65.4% | 49.8% |
| Currently Married | 42.0% | 64.2% | 48.0% |
| Married but Separated | 0.7% | 1.2% | 1.8% |
| Single Population | 57.3% | 34.6% | 50.2% |
| Never Married | 39.1% | 20.5% | 33.8% |
| Divorced | 11.9% | 6.6% | 10.8% |
| Widowed | 6.3% | 7.5% | 5.6% |
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| Household Size | 3.13 | 2.55 | 2.60 |
| Households | 1,216 | 724 | 124,010,992 |
| Family Households | 820 | 500 | 80,755,759 |
| Married couple, w/children | 33.7% | 48.8% | 30.5% |
| Married couple, no children | 35.1% | 40.8% | 42.9% |
| Non Family Households | 396 | 224 | 43,255,233 |
| Single householder, w/children | 25.4% | 8.6% | 15.8% |
| Single householder, no children | 5.9% | 1.8% | 10.8% |