| | Somers, NY | Gurnee, IL | United States |
| Population | 21,419 | 30,826 | 329,725,481 |
| Female Population | 52.1% | 52.9% | 50.5% |
| Male Population | 48.0% | 47.1% | 49.5% |
| Median Age | 50.1 | 40 | 38.4 |
| space3 | | | |
| Population - 2010 | 20,568 | 31,256 | 309,327,143 |
| Population - 2000 | 18,346 | 28,834 | 285,036,114 |
| Population - 1990 | 16,216 | 13,701 | 251,960,433 |
| Pop. 2000 to Now | 17.1% | 4.6% | 15.6% |
| Pop. 1990 to Now | 32.4% | 120.2% | 30.8% |
| space4 | | | |
| Population Density | 722.6 | 2,282.9 | 93.4 |
| Land Area | 29.6 | 13.5 | 3,531,905.4 |
| Water Area | 2.5 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Somers, NY | Gurnee, IL | United States |
| Age 0 to 4 | 2.4% | 4.1% | 5.9% |
| Age 5 to 9 | 5.8% | 7.1% | 6.1% |
| Age 10 to 14 | 8.5% | 5.8% | 6.6% |
| Age 15 to 17 | 4.3% | 4.7% | 3.9% |
| Age 18 to 20 | 2.7% | 5.6% | 4.0% |
| Age 21 to 24 | 3.1% | 5.6% | 5.2% |
| Age 25 to 34 | 6.3% | 11.2% | 13.8% |
| Age 35 to 44 | 10.5% | 12.2% | 12.9% |
| Age 45 to 54 | 14.4% | 16.8% | 12.6% |
| Age 55 to 59 | 8.2% | 7.6% | 6.7% |
| Age 60 to 64 | 9.4% | 6.8% | 6.3% |
| Age 65 to 74 | 12.3% | 7.9% | 9.6% |
| Age 75 to 84 | 8.0% | 3.3% | 4.5% |
| Age 85 and over | 4.2% | 1.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Somers, NY | Gurnee, IL | United States |
| White | 81.2% | 61.5% | 59.4% |
| Black | 1.6% | 7.1% | 12.2% |
| Asian | 3.6% | 12.5% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.3% | 0.4% |
| Two or More Races | 1.3% | 3.2% | 3.2% |
| Hispanic | 11.8% | 15.4% | 18.4% |
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| Marriage & Family | | | |
| | Somers, NY | Gurnee, IL | United States |
| Married Population | 57.7% | 55.1% | 49.8% |
| Currently Married | 57.2% | 54.3% | 48.0% |
| Married but Separated | 0.5% | 0.8% | 1.8% |
| Single Population | 42.3% | 44.9% | 50.2% |
| Never Married | 23.4% | 32.5% | 33.8% |
| Divorced | 10.4% | 7.7% | 10.8% |
| Widowed | 8.4% | 4.7% | 5.6% |
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| Household Size | 2.55 | 2.65 | 2.60 |
| Households | 8,173 | 11,630 | 124,010,992 |
| Family Households | 5,724 | 8,134 | 80,755,759 |
| Married couple, w/children | 34.1% | 36.3% | 30.5% |
| Married couple, no children | 51.3% | 45.7% | 42.9% |
| Non Family Households | 2,449 | 3,496 | 43,255,233 |
| Single householder, w/children | 5.8% | 10.1% | 15.8% |
| Single householder, no children | 8.8% | 7.9% | 10.8% |