| | Muskego, WI | Spring Hill, TN | United States |
| Population | 24,991 | 48,403 | 329,725,481 |
| Female Population | 48.7% | 50.7% | 50.5% |
| Male Population | 51.3% | 49.3% | 49.5% |
| Median Age | 43.5 | 35.2 | 38.4 |
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| Population - 2010 | 24,155 | 29,309 | 309,327,143 |
| Population - 2000 | 21,397 | 7,715 | 285,036,114 |
| Population - 1990 | 16,813 | 1,464 | 251,960,433 |
| Pop. 2000 to Now | 18.3% | 498.2% | 15.6% |
| Pop. 1990 to Now | 50.6% | 3,052.5% | 30.8% |
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| Population Density | 790.8 | 1,807.0 | 93.4 |
| Land Area | 31.6 | 26.8 | 3,531,905.4 |
| Water Area | 4.4 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Muskego, WI | Spring Hill, TN | United States |
| Age 0 to 4 | 4.6% | 7.4% | 5.9% |
| Age 5 to 9 | 6.1% | 11.4% | 6.1% |
| Age 10 to 14 | 7.2% | 8.1% | 6.6% |
| Age 15 to 17 | 5.2% | 3.4% | 3.9% |
| Age 18 to 20 | 2.9% | 4.1% | 4.0% |
| Age 21 to 24 | 4.5% | 2.6% | 5.2% |
| Age 25 to 34 | 7.1% | 12.6% | 13.8% |
| Age 35 to 44 | 14.0% | 18.9% | 12.9% |
| Age 45 to 54 | 15.2% | 11.8% | 12.6% |
| Age 55 to 59 | 8.9% | 4.6% | 6.7% |
| Age 60 to 64 | 7.1% | 4.5% | 6.3% |
| Age 65 to 74 | 11.4% | 7.1% | 9.6% |
| Age 75 to 84 | 4.1% | 2.9% | 4.5% |
| Age 85 and over | 1.8% | 0.4% | 1.9% |
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| Race | | | |
| | Muskego, WI | Spring Hill, TN | United States |
| White | 93.4% | 84.6% | 59.4% |
| Black | 0.6% | 4.8% | 12.2% |
| Asian | 0.9% | 1.3% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 1.5% | 2.9% | 3.2% |
| Hispanic | 3.3% | 6.2% | 18.4% |
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| Marriage & Family | | | |
| | Muskego, WI | Spring Hill, TN | United States |
| Married Population | 63.3% | 66.0% | 49.8% |
| Currently Married | 63.2% | 65.5% | 48.0% |
| Married but Separated | 0.1% | 0.5% | 1.8% |
| Single Population | 36.7% | 34.0% | 50.2% |
| Never Married | 22.8% | 23.6% | 33.8% |
| Divorced | 8.0% | 7.2% | 10.8% |
| Widowed | 5.9% | 3.3% | 5.6% |
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| Household Size | 2.59 | 2.85 | 2.60 |
| Households | 9,600 | 16,942 | 124,010,992 |
| Family Households | 7,314 | 13,649 | 80,755,759 |
| Married couple, w/children | 34.4% | 44.0% | 30.5% |
| Married couple, no children | 53.0% | 38.6% | 42.9% |
| Non Family Households | 2,286 | 3,293 | 43,255,233 |
| Single householder, w/children | 6.7% | 11.5% | 15.8% |
| Single householder, no children | 5.9% | 5.8% | 10.8% |