| | Elm Grove, WI | Mukwonago, WI | United States |
| Population | 6,456 | 8,255 | 329,725,481 |
| Female Population | 53.0% | 51.2% | 50.5% |
| Male Population | 47.0% | 48.8% | 49.5% |
| Median Age | 45 | 40 | 38.4 |
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| Population - 2010 | 5,931 | 7,376 | 309,327,143 |
| Population - 2000 | 6,249 | 6,162 | 285,036,114 |
| Population - 1990 | 6,261 | 4,457 | 251,960,433 |
| Pop. 2000 to Now | -1.8% | 31.6% | 15.6% |
| Pop. 1990 to Now | -2.0% | 81.9% | 30.8% |
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| Population Density | 1,979.8 | 1,016.5 | 93.4 |
| Land Area | 3.3 | 8.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Elm Grove, WI | Mukwonago, WI | United States |
| Age 0 to 4 | 7.8% | 5.4% | 5.9% |
| Age 5 to 9 | 7.3% | 7.7% | 6.1% |
| Age 10 to 14 | 5.1% | 7.5% | 6.6% |
| Age 15 to 17 | 5.0% | 3.2% | 3.9% |
| Age 18 to 20 | 4.0% | 4.1% | 4.0% |
| Age 21 to 24 | 3.6% | 3.9% | 5.2% |
| Age 25 to 34 | 7.6% | 9.1% | 13.8% |
| Age 35 to 44 | 9.6% | 16.5% | 12.9% |
| Age 45 to 54 | 13.9% | 14.0% | 12.6% |
| Age 55 to 59 | 6.0% | 6.8% | 6.7% |
| Age 60 to 64 | 7.3% | 6.7% | 6.3% |
| Age 65 to 74 | 11.4% | 10.3% | 9.6% |
| Age 75 to 84 | 8.0% | 3.4% | 4.5% |
| Age 85 and over | 3.5% | 1.3% | 1.9% |
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| Race | | | |
| | Elm Grove, WI | Mukwonago, WI | United States |
| White | 88.1% | 87.3% | 59.4% |
| Black | 2.1% | 0.1% | 12.2% |
| Asian | 2.9% | 3.6% | 5.6% |
| Native American | 0.1% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 3.2% | 1.6% | 3.2% |
| Hispanic | 3.4% | 7.3% | 18.4% |
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| Marriage & Family | | | |
| | Elm Grove, WI | Mukwonago, WI | United States |
| Married Population | 61.4% | 59.2% | 49.8% |
| Currently Married | 61.1% | 58.4% | 48.0% |
| Married but Separated | 0.2% | 0.8% | 1.8% |
| Single Population | 38.7% | 40.8% | 50.2% |
| Never Married | 23.2% | 24.4% | 33.8% |
| Divorced | 10.2% | 11.1% | 10.8% |
| Widowed | 5.2% | 5.3% | 5.6% |
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| Household Size | 2.78 | 2.58 | 2.60 |
| Households | 2,272 | 3,179 | 124,010,992 |
| Family Households | 1,701 | 2,088 | 80,755,759 |
| Married couple, w/children | 35.3% | 45.8% | 30.5% |
| Married couple, no children | 49.9% | 40.7% | 42.9% |
| Non Family Households | 571 | 1,091 | 43,255,233 |
| Single householder, w/children | 8.8% | 5.7% | 15.8% |
| Single householder, no children | 6.0% | 7.8% | 10.8% |