| | Stoystown, PA | Derby, KS | United States |
| Population | 395 | 25,365 | 329,725,481 |
| Female Population | 55.4% | 50.6% | 50.5% |
| Male Population | 44.6% | 49.4% | 49.5% |
| Median Age | 47.9 | 35.6 | 38.4 |
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| Population - 2010 | 346 | 22,524 | 309,327,143 |
| Population - 2000 | 428 | 17,807 | 285,036,114 |
| Population - 1990 | 389 | 14,699 | 251,960,433 |
| Pop. 2000 to Now | -25.9% | 41.2% | 15.6% |
| Pop. 1990 to Now | -18.5% | 71.1% | 30.8% |
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| Population Density | 2,079.0 | 2,473.4 | 93.4 |
| Land Area | 0.2 | 10.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Stoystown, PA | Derby, KS | United States |
| Age 0 to 4 | 6.3% | 5.5% | 5.9% |
| Age 5 to 9 | 4.6% | 8.3% | 6.1% |
| Age 10 to 14 | 3.0% | 9.1% | 6.6% |
| Age 15 to 17 | 0.8% | 4.2% | 3.9% |
| Age 18 to 20 | 5.6% | 3.3% | 4.0% |
| Age 21 to 24 | 5.6% | 5.2% | 5.2% |
| Age 25 to 34 | 10.1% | 12.9% | 13.8% |
| Age 35 to 44 | 9.1% | 14.6% | 12.9% |
| Age 45 to 54 | 9.9% | 10.1% | 12.6% |
| Age 55 to 59 | 5.8% | 7.1% | 6.7% |
| Age 60 to 64 | 4.3% | 4.9% | 6.3% |
| Age 65 to 74 | 20.3% | 7.7% | 9.6% |
| Age 75 to 84 | 9.6% | 5.1% | 4.5% |
| Age 85 and over | 5.1% | 2.0% | 1.9% |
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| Race | | | |
| | Stoystown, PA | Derby, KS | United States |
| White | 95.2% | 82.3% | 59.4% |
| Black | 0.0% | 1.2% | 12.2% |
| Asian | 0.0% | 1.3% | 5.6% |
| Native American | 0.0% | 0.7% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 4.6% | 5.7% | 3.2% |
| Hispanic | 0.0% | 8.7% | 18.4% |
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| Marriage & Family | | | |
| | Stoystown, PA | Derby, KS | United States |
| Married Population | 55.3% | 60.3% | 49.8% |
| Currently Married | 52.4% | 59.1% | 48.0% |
| Married but Separated | 2.9% | 1.1% | 1.8% |
| Single Population | 44.7% | 39.7% | 50.2% |
| Never Married | 21.8% | 23.4% | 33.8% |
| Divorced | 9.4% | 10.6% | 10.8% |
| Widowed | 13.5% | 5.8% | 5.6% |
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| Household Size | 2.21 | 2.54 | 2.60 |
| Households | 179 | 9,953 | 124,010,992 |
| Family Households | 101 | 6,783 | 80,755,759 |
| Married couple, w/children | 19.8% | 37.1% | 30.5% |
| Married couple, no children | 63.4% | 43.1% | 42.9% |
| Non Family Households | 78 | 3,170 | 43,255,233 |
| Single householder, w/children | 5.9% | 10.8% | 15.8% |
| Single householder, no children | 10.9% | 9.0% | 10.8% |