| | Muskego, WI | Menomonee Falls, WI | United States |
| Population | 24,991 | 38,219 | 329,725,481 |
| Female Population | 48.7% | 53.0% | 50.5% |
| Male Population | 51.3% | 47.1% | 49.5% |
| Median Age | 43.5 | 41.6 | 38.4 |
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| Population - 2010 | 24,155 | 35,625 | 309,327,143 |
| Population - 2000 | 21,397 | 32,647 | 285,036,114 |
| Population - 1990 | 16,813 | 26,840 | 251,960,433 |
| Pop. 2000 to Now | 18.3% | 17.1% | 15.6% |
| Pop. 1990 to Now | 50.6% | 42.5% | 30.8% |
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| Population Density | 790.8 | 1,161.4 | 93.4 |
| Land Area | 31.6 | 32.9 | 3,531,905.4 |
| Water Area | 4.4 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Muskego, WI | Menomonee Falls, WI | United States |
| Age 0 to 4 | 4.6% | 5.8% | 5.9% |
| Age 5 to 9 | 6.1% | 7.0% | 6.1% |
| Age 10 to 14 | 7.2% | 5.9% | 6.6% |
| Age 15 to 17 | 5.2% | 4.7% | 3.9% |
| Age 18 to 20 | 2.9% | 3.1% | 4.0% |
| Age 21 to 24 | 4.5% | 2.8% | 5.2% |
| Age 25 to 34 | 7.1% | 10.9% | 13.8% |
| Age 35 to 44 | 14.0% | 13.8% | 12.9% |
| Age 45 to 54 | 15.2% | 12.8% | 12.6% |
| Age 55 to 59 | 8.9% | 7.3% | 6.7% |
| Age 60 to 64 | 7.1% | 6.8% | 6.3% |
| Age 65 to 74 | 11.4% | 9.4% | 9.6% |
| Age 75 to 84 | 4.1% | 5.5% | 4.5% |
| Age 85 and over | 1.8% | 4.1% | 1.9% |
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| Race | | | |
| | Muskego, WI | Menomonee Falls, WI | United States |
| White | 93.4% | 84.3% | 59.4% |
| Black | 0.6% | 4.1% | 12.2% |
| Asian | 0.9% | 4.3% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.1% | 0.4% | 0.4% |
| Two or More Races | 1.5% | 2.1% | 3.2% |
| Hispanic | 3.3% | 4.7% | 18.4% |
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| Marriage & Family | | | |
| | Muskego, WI | Menomonee Falls, WI | United States |
| Married Population | 63.3% | 59.5% | 49.8% |
| Currently Married | 63.2% | 59.0% | 48.0% |
| Married but Separated | 0.1% | 0.5% | 1.8% |
| Single Population | 36.7% | 40.5% | 50.2% |
| Never Married | 22.8% | 24.2% | 33.8% |
| Divorced | 8.0% | 8.3% | 10.8% |
| Widowed | 5.9% | 8.0% | 5.6% |
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| Household Size | 2.59 | 2.42 | 2.60 |
| Households | 9,600 | 15,736 | 124,010,992 |
| Family Households | 7,314 | 10,425 | 80,755,759 |
| Married couple, w/children | 34.4% | 36.2% | 30.5% |
| Married couple, no children | 53.0% | 48.4% | 42.9% |
| Non Family Households | 2,286 | 5,311 | 43,255,233 |
| Single householder, w/children | 6.7% | 8.5% | 15.8% |
| Single householder, no children | 5.9% | 6.9% | 10.8% |