| | Auburn, PA | Shelbyville, IN | United States |
| Population | 574 | 19,710 | 329,725,481 |
| Female Population | 45.7% | 51.0% | 50.5% |
| Male Population | 54.4% | 49.1% | 49.5% |
| Median Age | 47.2 | 35.2 | 38.4 |
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| Population - 2010 | 731 | 19,030 | 309,327,143 |
| Population - 2000 | 839 | 17,951 | 285,036,114 |
| Population - 1990 | 913 | 15,336 | 251,960,433 |
| Pop. 2000 to Now | -17.9% | 8.7% | 15.6% |
| Pop. 1990 to Now | -24.5% | 27.2% | 30.8% |
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| Population Density | 353.7 | 1,731.5 | 93.4 |
| Land Area | 1.6 | 11.4 | 3,531,905.4 |
| Water Area | 0.1 | 0.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Auburn, PA | Shelbyville, IN | United States |
| Age 0 to 4 | 1.6% | 6.7% | 5.9% |
| Age 5 to 9 | 3.8% | 6.2% | 6.1% |
| Age 10 to 14 | 7.8% | 8.3% | 6.6% |
| Age 15 to 17 | 4.2% | 3.4% | 3.9% |
| Age 18 to 20 | 4.2% | 3.4% | 4.0% |
| Age 21 to 24 | 7.0% | 3.2% | 5.2% |
| Age 25 to 34 | 11.5% | 18.2% | 13.8% |
| Age 35 to 44 | 8.9% | 10.9% | 12.9% |
| Age 45 to 54 | 11.3% | 11.7% | 12.6% |
| Age 55 to 59 | 9.2% | 5.9% | 6.7% |
| Age 60 to 64 | 9.9% | 6.7% | 6.3% |
| Age 65 to 74 | 11.7% | 9.1% | 9.6% |
| Age 75 to 84 | 6.4% | 3.7% | 4.5% |
| Age 85 and over | 2.4% | 2.4% | 1.9% |
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| Race | | | |
| | Auburn, PA | Shelbyville, IN | United States |
| White | 95.8% | 86.9% | 59.4% |
| Black | 0.0% | 2.1% | 12.2% |
| Asian | 0.0% | 0.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 2.3% | 1.3% | 3.2% |
| Hispanic | 1.9% | 8.7% | 18.4% |
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| Marriage & Family | | | |
| | Auburn, PA | Shelbyville, IN | United States |
| Married Population | 52.0% | 50.3% | 49.8% |
| Currently Married | 50.4% | 48.1% | 48.0% |
| Married but Separated | 1.6% | 2.2% | 1.8% |
| Single Population | 48.0% | 49.7% | 50.2% |
| Never Married | 33.5% | 26.3% | 33.8% |
| Divorced | 10.6% | 16.7% | 10.8% |
| Widowed | 3.8% | 6.7% | 5.6% |
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| Household Size | 2.46 | 2.35 | 2.60 |
| Households | 233 | 8,174 | 124,010,992 |
| Family Households | 165 | 4,710 | 80,755,759 |
| Married couple, w/children | 21.8% | 31.3% | 30.5% |
| Married couple, no children | 55.8% | 43.1% | 42.9% |
| Non Family Households | 68 | 3,464 | 43,255,233 |
| Single householder, w/children | 12.1% | 19.9% | 15.8% |
| Single householder, no children | 10.3% | 5.7% | 10.8% |