| | Round Lake Beach, IL | Hebron, IL | United States |
| Population | 27,412 | 1,540 | 329,725,481 |
| Female Population | 47.1% | 52.4% | 50.5% |
| Male Population | 52.9% | 47.6% | 49.5% |
| Median Age | 33.2 | 36 | 38.4 |
| space3 | | | |
| Population - 2010 | 28,108 | 1,200 | 309,327,143 |
| Population - 2000 | 25,859 | 1,038 | 285,036,114 |
| Population - 1990 | 16,434 | 809 | 251,960,433 |
| Pop. 2000 to Now | 4.1% | 13.2% | 15.6% |
| Pop. 1990 to Now | 63.8% | 45.2% | 30.8% |
| space4 | | | |
| Population Density | 5,432.4 | 789.7 | 93.4 |
| Land Area | 5.0 | 2.0 | 3,531,905.4 |
| Water Area | 0.2 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Round Lake Beach, IL | Hebron, IL | United States |
| Age 0 to 4 | 7.0% | 6.0% | 5.9% |
| Age 5 to 9 | 7.5% | 4.6% | 6.1% |
| Age 10 to 14 | 8.6% | 10.8% | 6.6% |
| Age 15 to 17 | 5.7% | 4.2% | 3.9% |
| Age 18 to 20 | 3.5% | 4.8% | 4.0% |
| Age 21 to 24 | 5.7% | 6.9% | 5.2% |
| Age 25 to 34 | 15.3% | 11.1% | 13.8% |
| Age 35 to 44 | 14.4% | 9.4% | 12.9% |
| Age 45 to 54 | 12.5% | 17.6% | 12.6% |
| Age 55 to 59 | 6.4% | 6.2% | 6.7% |
| Age 60 to 64 | 5.3% | 7.7% | 6.3% |
| Age 65 to 74 | 5.3% | 8.0% | 9.6% |
| Age 75 to 84 | 2.3% | 1.4% | 4.5% |
| Age 85 and over | 0.6% | 1.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Round Lake Beach, IL | Hebron, IL | United States |
| White | 39.6% | 72.0% | 59.4% |
| Black | 5.1% | 1.3% | 12.2% |
| Asian | 2.1% | 0.0% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.1% | 0.4% |
| Two or More Races | 1.9% | 1.6% | 3.2% |
| Hispanic | 50.7% | 25.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Round Lake Beach, IL | Hebron, IL | United States |
| Married Population | 48.3% | 44.3% | 49.8% |
| Currently Married | 47.1% | 43.8% | 48.0% |
| Married but Separated | 1.3% | 0.6% | 1.8% |
| Single Population | 51.7% | 55.7% | 50.2% |
| Never Married | 37.6% | 38.2% | 33.8% |
| Divorced | 9.8% | 13.3% | 10.8% |
| Widowed | 4.3% | 4.1% | 5.6% |
| space5 | | | |
| Household Size | 3.26 | 2.83 | 2.60 |
| Households | 8,359 | 537 | 124,010,992 |
| Family Households | 6,442 | 411 | 80,755,759 |
| Married couple, w/children | 37.5% | 26.3% | 30.5% |
| Married couple, no children | 32.3% | 34.6% | 42.9% |
| Non Family Households | 1,917 | 126 | 43,255,233 |
| Single householder, w/children | 20.3% | 28.7% | 15.8% |
| Single householder, no children | 10.0% | 10.5% | 10.8% |