| | Germantown, WI | Shelbyville, IN | United States |
| Population | 20,780 | 19,710 | 329,725,481 |
| Female Population | 50.7% | 51.0% | 50.5% |
| Male Population | 49.4% | 49.1% | 49.5% |
| Median Age | 40.6 | 35.2 | 38.4 |
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| Population - 2010 | 19,968 | 19,030 | 309,327,143 |
| Population - 2000 | 18,260 | 17,951 | 285,036,114 |
| Population - 1990 | 13,658 | 15,336 | 251,960,433 |
| Pop. 2000 to Now | 9.8% | 8.7% | 15.6% |
| Pop. 1990 to Now | 46.9% | 27.2% | 30.8% |
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| Population Density | 604.5 | 1,731.5 | 93.4 |
| Land Area | 34.4 | 11.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Germantown, WI | Shelbyville, IN | United States |
| Age 0 to 4 | 5.7% | 6.7% | 5.9% |
| Age 5 to 9 | 4.8% | 6.2% | 6.1% |
| Age 10 to 14 | 8.7% | 8.3% | 6.6% |
| Age 15 to 17 | 5.8% | 3.4% | 3.9% |
| Age 18 to 20 | 2.2% | 3.4% | 4.0% |
| Age 21 to 24 | 3.7% | 3.2% | 5.2% |
| Age 25 to 34 | 9.2% | 18.2% | 13.8% |
| Age 35 to 44 | 15.5% | 10.9% | 12.9% |
| Age 45 to 54 | 14.1% | 11.7% | 12.6% |
| Age 55 to 59 | 8.5% | 5.9% | 6.7% |
| Age 60 to 64 | 7.3% | 6.7% | 6.3% |
| Age 65 to 74 | 7.7% | 9.1% | 9.6% |
| Age 75 to 84 | 4.4% | 3.7% | 4.5% |
| Age 85 and over | 2.5% | 2.4% | 1.9% |
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| Race | | | |
| | Germantown, WI | Shelbyville, IN | United States |
| White | 85.7% | 86.9% | 59.4% |
| Black | 2.9% | 2.1% | 12.2% |
| Asian | 5.9% | 0.8% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 2.1% | 1.3% | 3.2% |
| Hispanic | 3.1% | 8.7% | 18.4% |
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| Marriage & Family | | | |
| | Germantown, WI | Shelbyville, IN | United States |
| Married Population | 59.6% | 50.3% | 49.8% |
| Currently Married | 59.4% | 48.1% | 48.0% |
| Married but Separated | 0.2% | 2.2% | 1.8% |
| Single Population | 40.4% | 49.7% | 50.2% |
| Never Married | 27.6% | 26.3% | 33.8% |
| Divorced | 8.1% | 16.7% | 10.8% |
| Widowed | 4.7% | 6.7% | 5.6% |
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| Household Size | 2.55 | 2.35 | 2.60 |
| Households | 8,111 | 8,174 | 124,010,992 |
| Family Households | 5,928 | 4,710 | 80,755,759 |
| Married couple, w/children | 36.9% | 31.3% | 30.5% |
| Married couple, no children | 46.1% | 43.1% | 42.9% |
| Non Family Households | 2,183 | 3,464 | 43,255,233 |
| Single householder, w/children | 10.7% | 19.9% | 15.8% |
| Single householder, no children | 6.2% | 5.7% | 10.8% |