| | Lyons, IL | Riverside, IL | United States |
| Population | 10,665 | 9,346 | 329,725,481 |
| Female Population | 50.3% | 51.9% | 50.5% |
| Male Population | 49.7% | 48.1% | 49.5% |
| Median Age | 37.9 | 44.2 | 38.4 |
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| Population - 2010 | 10,739 | 8,879 | 309,327,143 |
| Population - 2000 | 10,255 | 8,895 | 285,036,114 |
| Population - 1990 | 9,828 | 8,774 | 251,960,433 |
| Pop. 2000 to Now | -0.1% | -5.0% | 15.6% |
| Pop. 1990 to Now | 4.3% | -3.6% | 30.8% |
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| Population Density | 4,878.8 | 4,725.0 | 93.4 |
| Land Area | 2.2 | 2.0 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Lyons, IL | Riverside, IL | United States |
| Age 0 to 4 | 9.3% | 4.1% | 5.9% |
| Age 5 to 9 | 9.3% | 7.2% | 6.1% |
| Age 10 to 14 | 4.7% | 8.3% | 6.6% |
| Age 15 to 17 | 1.8% | 6.0% | 3.9% |
| Age 18 to 20 | 2.7% | 2.8% | 4.0% |
| Age 21 to 24 | 3.7% | 3.0% | 5.2% |
| Age 25 to 34 | 13.7% | 8.0% | 13.8% |
| Age 35 to 44 | 14.9% | 11.1% | 12.9% |
| Age 45 to 54 | 12.5% | 14.0% | 12.6% |
| Age 55 to 59 | 6.2% | 8.7% | 6.7% |
| Age 60 to 64 | 4.8% | 8.9% | 6.3% |
| Age 65 to 74 | 8.8% | 12.2% | 9.6% |
| Age 75 to 84 | 6.3% | 3.8% | 4.5% |
| Age 85 and over | 1.0% | 2.0% | 1.9% |
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| Race | | | |
| | Lyons, IL | Riverside, IL | United States |
| White | 36.1% | 71.7% | 59.4% |
| Black | 2.6% | 0.7% | 12.2% |
| Asian | 3.4% | 2.1% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 2.1% | 3.2% |
| Hispanic | 56.5% | 23.5% | 18.4% |
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| Marriage & Family | | | |
| | Lyons, IL | Riverside, IL | United States |
| Married Population | 52.3% | 59.8% | 49.8% |
| Currently Married | 50.5% | 58.6% | 48.0% |
| Married but Separated | 1.8% | 1.2% | 1.8% |
| Single Population | 47.7% | 40.2% | 50.2% |
| Never Married | 31.9% | 27.5% | 33.8% |
| Divorced | 9.1% | 7.8% | 10.8% |
| Widowed | 6.8% | 4.8% | 5.6% |
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| Household Size | 2.71 | 2.70 | 2.60 |
| Households | 3,918 | 3,465 | 124,010,992 |
| Family Households | 2,394 | 2,629 | 80,755,759 |
| Married couple, w/children | 37.1% | 34.8% | 30.5% |
| Married couple, no children | 33.2% | 46.3% | 42.9% |
| Non Family Households | 1,524 | 836 | 43,255,233 |
| Single householder, w/children | 17.2% | 9.8% | 15.8% |
| Single householder, no children | 12.5% | 9.2% | 10.8% |