| | Mundelein, IL | Jefferson, GA | United States |
| Population | 31,596 | 12,727 | 329,725,481 |
| Female Population | 48.9% | 46.7% | 50.5% |
| Male Population | 51.2% | 53.3% | 49.5% |
| Median Age | 37.6 | 33.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 31,039 | 9,541 | 309,327,143 |
| Population - 2000 | 30,935 | 3,825 | 285,036,114 |
| Population - 1990 | 21,215 | 2,763 | 251,960,433 |
| Pop. 2000 to Now | 0.0% | 226.5% | 15.6% |
| Pop. 1990 to Now | 45.9% | 352.0% | 30.8% |
| space4 | | | |
| Population Density | 3,313.7 | 567.9 | 93.4 |
| Land Area | 9.5 | 22.4 | 3,531,905.4 |
| Water Area | 0.4 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mundelein, IL | Jefferson, GA | United States |
| Age 0 to 4 | 7.0% | 6.4% | 5.9% |
| Age 5 to 9 | 6.4% | 6.3% | 6.1% |
| Age 10 to 14 | 5.3% | 11.4% | 6.6% |
| Age 15 to 17 | 4.1% | 6.5% | 3.9% |
| Age 18 to 20 | 3.9% | 2.2% | 4.0% |
| Age 21 to 24 | 4.6% | 3.2% | 5.2% |
| Age 25 to 34 | 14.3% | 17.2% | 13.8% |
| Age 35 to 44 | 13.2% | 15.4% | 12.9% |
| Age 45 to 54 | 13.8% | 11.6% | 12.6% |
| Age 55 to 59 | 5.8% | 3.6% | 6.7% |
| Age 60 to 64 | 7.4% | 4.7% | 6.3% |
| Age 65 to 74 | 8.9% | 6.4% | 9.6% |
| Age 75 to 84 | 4.0% | 3.9% | 4.5% |
| Age 85 and over | 1.6% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mundelein, IL | Jefferson, GA | United States |
| White | 52.2% | 73.6% | 59.4% |
| Black | 1.3% | 15.4% | 12.2% |
| Asian | 10.6% | 1.0% | 5.6% |
| Native American | 0.4% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.4% | 0.1% | 0.4% |
| Two or More Races | 1.6% | 1.0% | 3.2% |
| Hispanic | 33.2% | 8.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mundelein, IL | Jefferson, GA | United States |
| Married Population | 55.5% | 59.3% | 49.8% |
| Currently Married | 54.9% | 57.3% | 48.0% |
| Married but Separated | 0.6% | 2.0% | 1.8% |
| Single Population | 44.5% | 40.7% | 50.2% |
| Never Married | 32.5% | 27.4% | 33.8% |
| Divorced | 8.2% | 8.0% | 10.8% |
| Widowed | 3.8% | 5.3% | 5.6% |
| space5 | | | |
| Household Size | 2.80 | 3.19 | 2.60 |
| Households | 11,178 | 3,988 | 124,010,992 |
| Family Households | 8,092 | 3,146 | 80,755,759 |
| Married couple, w/children | 35.8% | 50.4% | 30.5% |
| Married couple, no children | 46.8% | 34.7% | 42.9% |
| Non Family Households | 3,086 | 842 | 43,255,233 |
| Single householder, w/children | 8.8% | 10.6% | 15.8% |
| Single householder, no children | 8.6% | 4.3% | 10.8% |