| | Grafton, WI | Menomonee Falls, WI | United States |
| Population | 12,081 | 38,219 | 329,725,481 |
| Female Population | 51.5% | 53.0% | 50.5% |
| Male Population | 48.5% | 47.1% | 49.5% |
| Median Age | 42.3 | 41.6 | 38.4 |
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| Population - 2010 | 11,515 | 35,625 | 309,327,143 |
| Population - 2000 | 10,312 | 32,647 | 285,036,114 |
| Population - 1990 | 9,340 | 26,840 | 251,960,433 |
| Pop. 2000 to Now | 14.0% | 17.1% | 15.6% |
| Pop. 1990 to Now | 25.9% | 42.5% | 30.8% |
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| Population Density | 2,374.4 | 1,161.4 | 93.4 |
| Land Area | 5.1 | 32.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Grafton, WI | Menomonee Falls, WI | United States |
| Age 0 to 4 | 5.1% | 5.8% | 5.9% |
| Age 5 to 9 | 4.4% | 7.0% | 6.1% |
| Age 10 to 14 | 6.1% | 5.9% | 6.6% |
| Age 15 to 17 | 3.3% | 4.7% | 3.9% |
| Age 18 to 20 | 3.0% | 3.1% | 4.0% |
| Age 21 to 24 | 5.2% | 2.8% | 5.2% |
| Age 25 to 34 | 14.3% | 10.9% | 13.8% |
| Age 35 to 44 | 11.9% | 13.8% | 12.9% |
| Age 45 to 54 | 9.9% | 12.8% | 12.6% |
| Age 55 to 59 | 8.0% | 7.3% | 6.7% |
| Age 60 to 64 | 7.2% | 6.8% | 6.3% |
| Age 65 to 74 | 12.8% | 9.4% | 9.6% |
| Age 75 to 84 | 7.4% | 5.5% | 4.5% |
| Age 85 and over | 1.5% | 4.1% | 1.9% |
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| Race | | | |
| | Grafton, WI | Menomonee Falls, WI | United States |
| White | 91.3% | 84.3% | 59.4% |
| Black | 0.9% | 4.1% | 12.2% |
| Asian | 1.4% | 4.3% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.2% | 0.4% | 0.4% |
| Two or More Races | 2.5% | 2.1% | 3.2% |
| Hispanic | 3.8% | 4.7% | 18.4% |
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| Marriage & Family | | | |
| | Grafton, WI | Menomonee Falls, WI | United States |
| Married Population | 55.2% | 59.5% | 49.8% |
| Currently Married | 54.5% | 59.0% | 48.0% |
| Married but Separated | 0.7% | 0.5% | 1.8% |
| Single Population | 44.8% | 40.5% | 50.2% |
| Never Married | 27.4% | 24.2% | 33.8% |
| Divorced | 11.5% | 8.3% | 10.8% |
| Widowed | 5.9% | 8.0% | 5.6% |
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| Household Size | 2.18 | 2.42 | 2.60 |
| Households | 5,544 | 15,736 | 124,010,992 |
| Family Households | 3,309 | 10,425 | 80,755,759 |
| Married couple, w/children | 27.2% | 36.2% | 30.5% |
| Married couple, no children | 56.7% | 48.4% | 42.9% |
| Non Family Households | 2,235 | 5,311 | 43,255,233 |
| Single householder, w/children | 11.5% | 8.5% | 15.8% |
| Single householder, no children | 4.6% | 6.9% | 10.8% |