| | Wilmington, IL | Libertyville, IL | United States |
| Population | 5,462 | 20,616 | 329,725,481 |
| Female Population | 54.7% | 52.7% | 50.5% |
| Male Population | 45.4% | 47.3% | 49.5% |
| Median Age | 47.5 | 42.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,778 | 20,420 | 309,327,143 |
| Population - 2000 | 5,134 | 20,742 | 285,036,114 |
| Population - 1990 | 4,743 | 19,174 | 251,960,433 |
| Pop. 2000 to Now | 9.0% | -2.8% | 15.6% |
| Pop. 1990 to Now | 18.0% | 5.1% | 30.8% |
| space4 | | | |
| Population Density | 387.8 | 2,340.6 | 93.4 |
| Land Area | 14.1 | 8.8 | 3,531,905.4 |
| Water Area | 0.7 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Wilmington, IL | Libertyville, IL | United States |
| Age 0 to 4 | 6.6% | 5.6% | 5.9% |
| Age 5 to 9 | 3.2% | 6.9% | 6.1% |
| Age 10 to 14 | 3.7% | 8.5% | 6.6% |
| Age 15 to 17 | 2.6% | 5.1% | 3.9% |
| Age 18 to 20 | 3.6% | 3.9% | 4.0% |
| Age 21 to 24 | 6.1% | 3.0% | 5.2% |
| Age 25 to 34 | 13.1% | 8.3% | 13.8% |
| Age 35 to 44 | 8.8% | 11.8% | 12.9% |
| Age 45 to 54 | 14.9% | 17.1% | 12.6% |
| Age 55 to 59 | 7.8% | 7.5% | 6.7% |
| Age 60 to 64 | 8.0% | 5.7% | 6.3% |
| Age 65 to 74 | 10.0% | 8.6% | 9.6% |
| Age 75 to 84 | 8.7% | 5.6% | 4.5% |
| Age 85 and over | 3.0% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Wilmington, IL | Libertyville, IL | United States |
| White | 88.0% | 83.5% | 59.4% |
| Black | 0.5% | 1.0% | 12.2% |
| Asian | 0.7% | 6.5% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.1% | 0.4% |
| Two or More Races | 1.8% | 2.2% | 3.2% |
| Hispanic | 8.6% | 6.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Wilmington, IL | Libertyville, IL | United States |
| Married Population | 47.4% | 62.6% | 49.8% |
| Currently Married | 46.4% | 61.8% | 48.0% |
| Married but Separated | 1.0% | 0.8% | 1.8% |
| Single Population | 52.6% | 37.4% | 50.2% |
| Never Married | 29.5% | 25.3% | 33.8% |
| Divorced | 14.8% | 6.4% | 10.8% |
| Widowed | 8.3% | 5.7% | 5.6% |
| space5 | | | |
| Household Size | 2.25 | 2.70 | 2.60 |
| Households | 2,350 | 7,458 | 124,010,992 |
| Family Households | 1,305 | 5,499 | 80,755,759 |
| Married couple, w/children | 28.4% | 42.9% | 30.5% |
| Married couple, no children | 50.3% | 46.2% | 42.9% |
| Non Family Households | 1,045 | 1,959 | 43,255,233 |
| Single householder, w/children | 12.5% | 6.3% | 15.8% |
| Single householder, no children | 8.8% | 4.6% | 10.8% |