| | Geneseo, IL | Muskego, WI | United States |
| Population | 6,774 | 24,991 | 329,725,481 |
| Female Population | 53.7% | 48.7% | 50.5% |
| Male Population | 46.3% | 51.3% | 49.5% |
| Median Age | 45.8 | 43.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,620 | 24,155 | 309,327,143 |
| Population - 2000 | 6,480 | 21,397 | 285,036,114 |
| Population - 1990 | 5,990 | 16,813 | 251,960,433 |
| Pop. 2000 to Now | 0.4% | 18.3% | 15.6% |
| Pop. 1990 to Now | 8.6% | 50.6% | 30.8% |
| space4 | | | |
| Population Density | 1,460.5 | 790.8 | 93.4 |
| Land Area | 4.6 | 31.6 | 3,531,905.4 |
| Water Area | 0.0 | 4.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Geneseo, IL | Muskego, WI | United States |
| Age 0 to 4 | 1.6% | 4.6% | 5.9% |
| Age 5 to 9 | 9.2% | 6.1% | 6.1% |
| Age 10 to 14 | 7.1% | 7.2% | 6.6% |
| Age 15 to 17 | 5.4% | 5.2% | 3.9% |
| Age 18 to 20 | 2.3% | 2.9% | 4.0% |
| Age 21 to 24 | 2.3% | 4.5% | 5.2% |
| Age 25 to 34 | 10.1% | 7.1% | 13.8% |
| Age 35 to 44 | 11.2% | 14.0% | 12.9% |
| Age 45 to 54 | 13.7% | 15.2% | 12.6% |
| Age 55 to 59 | 4.2% | 8.9% | 6.7% |
| Age 60 to 64 | 6.7% | 7.1% | 6.3% |
| Age 65 to 74 | 11.4% | 11.4% | 9.6% |
| Age 75 to 84 | 7.5% | 4.1% | 4.5% |
| Age 85 and over | 7.4% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Geneseo, IL | Muskego, WI | United States |
| White | 94.4% | 93.4% | 59.4% |
| Black | 0.0% | 0.6% | 12.2% |
| Asian | 1.6% | 0.9% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.8% | 1.5% | 3.2% |
| Hispanic | 3.3% | 3.3% | 18.4% |
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| Marriage & Family | | | |
| | Geneseo, IL | Muskego, WI | United States |
| Married Population | 53.8% | 63.3% | 49.8% |
| Currently Married | 53.4% | 63.2% | 48.0% |
| Married but Separated | 0.4% | 0.1% | 1.8% |
| Single Population | 46.2% | 36.7% | 50.2% |
| Never Married | 21.7% | 22.8% | 33.8% |
| Divorced | 14.6% | 8.0% | 10.8% |
| Widowed | 10.0% | 5.9% | 5.6% |
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| Household Size | 2.21 | 2.59 | 2.60 |
| Households | 3,028 | 9,600 | 124,010,992 |
| Family Households | 1,944 | 7,314 | 80,755,759 |
| Married couple, w/children | 32.7% | 34.4% | 30.5% |
| Married couple, no children | 44.3% | 53.0% | 42.9% |
| Non Family Households | 1,084 | 2,286 | 43,255,233 |
| Single householder, w/children | 20.6% | 6.7% | 15.8% |
| Single householder, no children | 2.4% | 5.9% | 10.8% |