| | Penn township (York County), PA | Penn township (Chester County), PA | United States |
| Population | 17,361 | 5,601 | 329,725,481 |
| Female Population | 49.3% | 51.2% | 50.5% |
| Male Population | 50.8% | 48.8% | 49.5% |
| Median Age | 39.2 | 48.5 | 38.4 |
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| Population - 2010 | 15,641 | 5,391 | 309,327,143 |
| Population - 2000 | 14,592 | 2,812 | 285,036,114 |
| Population - 1990 | 11,658 | 2,257 | 251,960,433 |
| Pop. 2000 to Now | 15.2% | 95.5% | 15.6% |
| Pop. 1990 to Now | 44.2% | 143.6% | 30.8% |
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| Population Density | 1,341.6 | 583.6 | 93.4 |
| Land Area | 12.9 | 9.6 | 3,531,905.4 |
| Water Area | 0.2 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Penn township (York County), PA | Penn township (Chester County), PA | United States |
| Age 0 to 4 | 5.8% | 3.6% | 5.9% |
| Age 5 to 9 | 6.4% | 6.4% | 6.1% |
| Age 10 to 14 | 6.0% | 7.7% | 6.6% |
| Age 15 to 17 | 3.4% | 3.6% | 3.9% |
| Age 18 to 20 | 3.2% | 4.6% | 4.0% |
| Age 21 to 24 | 4.5% | 3.6% | 5.2% |
| Age 25 to 34 | 15.2% | 5.1% | 13.8% |
| Age 35 to 44 | 10.4% | 12.1% | 12.9% |
| Age 45 to 54 | 13.6% | 12.6% | 12.6% |
| Age 55 to 59 | 5.9% | 5.7% | 6.7% |
| Age 60 to 64 | 5.6% | 5.7% | 6.3% |
| Age 65 to 74 | 10.3% | 14.4% | 9.6% |
| Age 75 to 84 | 6.7% | 8.4% | 4.5% |
| Age 85 and over | 3.0% | 6.7% | 1.9% |
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| Race | | | |
| | Penn township (York County), PA | Penn township (Chester County), PA | United States |
| White | 88.0% | 74.0% | 59.4% |
| Black | 1.1% | 1.6% | 12.2% |
| Asian | 2.7% | 3.6% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.5% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 6.3% | 3.2% |
| Hispanic | 6.8% | 14.6% | 18.4% |
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| Marriage & Family | | | |
| | Penn township (York County), PA | Penn township (Chester County), PA | United States |
| Married Population | 52.3% | 60.5% | 49.8% |
| Currently Married | 51.7% | 59.3% | 48.0% |
| Married but Separated | 0.6% | 1.2% | 1.8% |
| Single Population | 47.7% | 39.5% | 50.2% |
| Never Married | 29.8% | 21.5% | 33.8% |
| Divorced | 11.5% | 9.0% | 10.8% |
| Widowed | 6.4% | 9.0% | 5.6% |
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| Household Size | 2.58 | 2.64 | 2.60 |
| Households | 6,654 | 2,109 | 124,010,992 |
| Family Households | 4,593 | 1,429 | 80,755,759 |
| Married couple, w/children | 27.0% | 31.6% | 30.5% |
| Married couple, no children | 47.7% | 53.3% | 42.9% |
| Non Family Households | 2,061 | 680 | 43,255,233 |
| Single householder, w/children | 18.4% | 6.7% | 15.8% |
| Single householder, no children | 6.9% | 8.4% | 10.8% |