| | Pewaukee, WI | Mill Creek, WA | United States |
| Population | 15,589 | 20,665 | 329,725,481 |
| Female Population | 51.2% | 53.1% | 50.5% |
| Male Population | 48.8% | 46.9% | 49.5% |
| Median Age | 44.3 | 39.6 | 38.4 |
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| Population - 2010 | 13,197 | 18,268 | 309,327,143 |
| Population - 2000 | 11,783 | 11,525 | 285,036,114 |
| Population - 1990 | 9,060 | 7,172 | 251,960,433 |
| Pop. 2000 to Now | 24.8% | 80.5% | 15.6% |
| Pop. 1990 to Now | 62.3% | 190.0% | 30.8% |
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| Population Density | 799.8 | 4,488.5 | 93.4 |
| Land Area | 19.5 | 4.6 | 3,531,905.4 |
| Water Area | 1.7 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Pewaukee, WI | Mill Creek, WA | United States |
| Age 0 to 4 | 6.0% | 5.5% | 5.9% |
| Age 5 to 9 | 6.9% | 5.9% | 6.1% |
| Age 10 to 14 | 6.8% | 6.8% | 6.6% |
| Age 15 to 17 | 2.6% | 3.3% | 3.9% |
| Age 18 to 20 | 1.6% | 2.4% | 4.0% |
| Age 21 to 24 | 2.4% | 4.8% | 5.2% |
| Age 25 to 34 | 8.9% | 14.7% | 13.8% |
| Age 35 to 44 | 16.1% | 13.8% | 12.9% |
| Age 45 to 54 | 12.3% | 13.9% | 12.6% |
| Age 55 to 59 | 8.2% | 7.3% | 6.7% |
| Age 60 to 64 | 6.7% | 5.9% | 6.3% |
| Age 65 to 74 | 12.1% | 8.7% | 9.6% |
| Age 75 to 84 | 8.2% | 4.9% | 4.5% |
| Age 85 and over | 1.4% | 2.0% | 1.9% |
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| Race | | | |
| | Pewaukee, WI | Mill Creek, WA | United States |
| White | 87.9% | 60.2% | 59.4% |
| Black | 0.8% | 4.3% | 12.2% |
| Asian | 3.4% | 20.0% | 5.6% |
| Native American | 0.1% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.8% | 0.2% |
| Other | 0.0% | 0.5% | 0.4% |
| Two or More Races | 3.1% | 6.3% | 3.2% |
| Hispanic | 4.7% | 7.6% | 18.4% |
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| Marriage & Family | | | |
| | Pewaukee, WI | Mill Creek, WA | United States |
| Married Population | 69.0% | 58.6% | 49.8% |
| Currently Married | 68.9% | 57.5% | 48.0% |
| Married but Separated | 0.1% | 1.2% | 1.8% |
| Single Population | 31.0% | 41.4% | 50.2% |
| Never Married | 17.5% | 26.9% | 33.8% |
| Divorced | 9.2% | 10.2% | 10.8% |
| Widowed | 4.2% | 4.2% | 5.6% |
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| Household Size | 2.40 | 2.42 | 2.60 |
| Households | 6,457 | 8,492 | 124,010,992 |
| Family Households | 4,552 | 5,410 | 80,755,759 |
| Married couple, w/children | 34.8% | 40.8% | 30.5% |
| Married couple, no children | 58.7% | 44.8% | 42.9% |
| Non Family Households | 1,905 | 3,082 | 43,255,233 |
| Single householder, w/children | 3.6% | 7.4% | 15.8% |
| Single householder, no children | 2.9% | 7.0% | 10.8% |