| | Seymour, WI | Gurnee, IL | United States |
| Population | 3,542 | 30,826 | 329,725,481 |
| Female Population | 53.9% | 52.9% | 50.5% |
| Male Population | 46.1% | 47.1% | 49.5% |
| Median Age | 39 | 40 | 38.4 |
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| Population - 2010 | 3,454 | 31,256 | 309,327,143 |
| Population - 2000 | 3,335 | 28,834 | 285,036,114 |
| Population - 1990 | 2,782 | 13,701 | 251,960,433 |
| Pop. 2000 to Now | 3.7% | 4.6% | 15.6% |
| Pop. 1990 to Now | 24.3% | 120.2% | 30.8% |
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| Population Density | 1,315.8 | 2,282.9 | 93.4 |
| Land Area | 2.7 | 13.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Seymour, WI | Gurnee, IL | United States |
| Age 0 to 4 | 6.8% | 4.1% | 5.9% |
| Age 5 to 9 | 4.7% | 7.1% | 6.1% |
| Age 10 to 14 | 4.8% | 5.8% | 6.6% |
| Age 15 to 17 | 5.2% | 4.7% | 3.9% |
| Age 18 to 20 | 3.4% | 5.6% | 4.0% |
| Age 21 to 24 | 4.7% | 5.6% | 5.2% |
| Age 25 to 34 | 13.1% | 11.2% | 13.8% |
| Age 35 to 44 | 15.6% | 12.2% | 12.9% |
| Age 45 to 54 | 10.7% | 16.8% | 12.6% |
| Age 55 to 59 | 6.9% | 7.6% | 6.7% |
| Age 60 to 64 | 6.9% | 6.8% | 6.3% |
| Age 65 to 74 | 14.1% | 7.9% | 9.6% |
| Age 75 to 84 | 1.4% | 3.3% | 4.5% |
| Age 85 and over | 1.8% | 1.3% | 1.9% |
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| Race | | | |
| | Seymour, WI | Gurnee, IL | United States |
| White | 78.3% | 61.5% | 59.4% |
| Black | 0.6% | 7.1% | 12.2% |
| Asian | 0.3% | 12.5% | 5.6% |
| Native American | 5.6% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.0% | 0.3% | 0.4% |
| Two or More Races | 6.3% | 3.2% | 3.2% |
| Hispanic | 7.8% | 15.4% | 18.4% |
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| Marriage & Family | | | |
| | Seymour, WI | Gurnee, IL | United States |
| Married Population | 44.4% | 55.1% | 49.8% |
| Currently Married | 44.4% | 54.3% | 48.0% |
| Married but Separated | 0.0% | 0.8% | 1.8% |
| Single Population | 55.6% | 44.9% | 50.2% |
| Never Married | 32.5% | 32.5% | 33.8% |
| Divorced | 18.8% | 7.7% | 10.8% |
| Widowed | 4.3% | 4.7% | 5.6% |
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| Household Size | 2.66 | 2.65 | 2.60 |
| Households | 1,330 | 11,630 | 124,010,992 |
| Family Households | 830 | 8,134 | 80,755,759 |
| Married couple, w/children | 27.8% | 36.3% | 30.5% |
| Married couple, no children | 31.2% | 45.7% | 42.9% |
| Non Family Households | 500 | 3,496 | 43,255,233 |
| Single householder, w/children | 22.5% | 10.1% | 15.8% |
| Single householder, no children | 18.4% | 7.9% | 10.8% |