| | Delafield, WI | Benton, IL | United States |
| Population | 7,172 | 7,101 | 329,725,481 |
| Female Population | 53.3% | 52.1% | 50.5% |
| Male Population | 46.7% | 47.9% | 49.5% |
| Median Age | 47.4 | 40.4 | 38.4 |
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| Population - 2010 | 7,102 | 7,089 | 309,327,143 |
| Population - 2000 | 6,472 | 6,880 | 285,036,114 |
| Population - 1990 | 5,347 | 7,216 | 251,960,433 |
| Pop. 2000 to Now | 16.8% | -1.4% | 15.6% |
| Pop. 1990 to Now | 41.4% | -6.0% | 30.8% |
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| Population Density | 763.1 | 1,296.3 | 93.4 |
| Land Area | 9.4 | 5.5 | 3,531,905.4 |
| Water Area | 1.7 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Delafield, WI | Benton, IL | United States |
| Age 0 to 4 | 5.2% | 7.0% | 5.9% |
| Age 5 to 9 | 7.7% | 4.7% | 6.1% |
| Age 10 to 14 | 5.2% | 6.5% | 6.6% |
| Age 15 to 17 | 2.1% | 5.7% | 3.9% |
| Age 18 to 20 | 2.3% | 2.9% | 4.0% |
| Age 21 to 24 | 5.8% | 5.9% | 5.2% |
| Age 25 to 34 | 8.5% | 11.7% | 13.8% |
| Age 35 to 44 | 11.2% | 11.0% | 12.9% |
| Age 45 to 54 | 11.2% | 12.1% | 12.6% |
| Age 55 to 59 | 8.1% | 6.4% | 6.7% |
| Age 60 to 64 | 9.3% | 5.5% | 6.3% |
| Age 65 to 74 | 14.3% | 10.1% | 9.6% |
| Age 75 to 84 | 7.3% | 7.9% | 4.5% |
| Age 85 and over | 1.8% | 2.6% | 1.9% |
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| Race | | | |
| | Delafield, WI | Benton, IL | United States |
| White | 91.9% | 92.2% | 59.4% |
| Black | 2.3% | 1.1% | 12.2% |
| Asian | 1.9% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 2.3% | 3.2% |
| Hispanic | 2.1% | 4.4% | 18.4% |
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| Marriage & Family | | | |
| | Delafield, WI | Benton, IL | United States |
| Married Population | 56.4% | 45.5% | 49.8% |
| Currently Married | 56.2% | 43.3% | 48.0% |
| Married but Separated | 0.2% | 2.2% | 1.8% |
| Single Population | 43.6% | 54.5% | 50.2% |
| Never Married | 25.4% | 26.9% | 33.8% |
| Divorced | 13.5% | 17.3% | 10.8% |
| Widowed | 4.7% | 10.3% | 5.6% |
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| Household Size | 2.18 | 2.31 | 2.60 |
| Households | 3,210 | 2,941 | 124,010,992 |
| Family Households | 1,998 | 1,674 | 80,755,759 |
| Married couple, w/children | 26.9% | 30.6% | 30.5% |
| Married couple, no children | 53.1% | 37.9% | 42.9% |
| Non Family Households | 1,212 | 1,267 | 43,255,233 |
| Single householder, w/children | 13.4% | 21.8% | 15.8% |
| Single householder, no children | 6.7% | 9.7% | 10.8% |