| | Shelby, OH | Madison, OH | United States |
| Population | 8,294 | 3,396 | 329,725,481 |
| Female Population | 54.6% | 52.3% | 50.5% |
| Male Population | 45.4% | 47.7% | 49.5% |
| Median Age | 41.7 | 44.9 | 38.4 |
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| Population - 2010 | 9,307 | 3,183 | 309,327,143 |
| Population - 2000 | 9,821 | 2,921 | 285,036,114 |
| Population - 1990 | 9,564 | 2,477 | 251,960,433 |
| Pop. 2000 to Now | -7.7% | 8.2% | 15.6% |
| Pop. 1990 to Now | -5.2% | 27.5% | 30.8% |
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| Population Density | 1,316.1 | 667.6 | 93.4 |
| Land Area | 6.3 | 5.1 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Shelby, OH | Madison, OH | United States |
| Age 0 to 4 | 5.7% | 3.4% | 5.9% |
| Age 5 to 9 | 7.4% | 6.1% | 6.1% |
| Age 10 to 14 | 6.9% | 6.4% | 6.6% |
| Age 15 to 17 | 5.0% | 6.5% | 3.9% |
| Age 18 to 20 | 2.8% | 2.5% | 4.0% |
| Age 21 to 24 | 3.4% | 4.3% | 5.2% |
| Age 25 to 34 | 10.6% | 10.9% | 13.8% |
| Age 35 to 44 | 12.5% | 10.1% | 12.9% |
| Age 45 to 54 | 10.6% | 15.9% | 12.6% |
| Age 55 to 59 | 9.1% | 7.4% | 6.7% |
| Age 60 to 64 | 6.5% | 7.2% | 6.3% |
| Age 65 to 74 | 9.2% | 10.2% | 9.6% |
| Age 75 to 84 | 6.5% | 5.3% | 4.5% |
| Age 85 and over | 3.8% | 3.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Shelby, OH | Madison, OH | United States |
| White | 94.1% | 96.8% | 59.4% |
| Black | 0.4% | 1.1% | 12.2% |
| Asian | 2.1% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 1.2% | 1.7% | 3.2% |
| Hispanic | 2.2% | 0.0% | 18.4% |
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| Marriage & Family | | | |
| | Shelby, OH | Madison, OH | United States |
| Married Population | 48.8% | 60.3% | 49.8% |
| Currently Married | 47.9% | 60.3% | 48.0% |
| Married but Separated | 0.9% | 0.0% | 1.8% |
| Single Population | 51.2% | 39.7% | 50.2% |
| Never Married | 24.5% | 21.8% | 33.8% |
| Divorced | 17.6% | 11.4% | 10.8% |
| Widowed | 9.1% | 6.5% | 5.6% |
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| Household Size | 2.27 | 2.44 | 2.60 |
| Households | 3,578 | 1,388 | 124,010,992 |
| Family Households | 2,006 | 911 | 80,755,759 |
| Married couple, w/children | 22.8% | 37.5% | 30.5% |
| Married couple, no children | 51.7% | 56.0% | 42.9% |
| Non Family Households | 1,572 | 477 | 43,255,233 |
| Single householder, w/children | 13.6% | 4.7% | 15.8% |
| Single householder, no children | 11.9% | 1.8% | 10.8% |