| | Jermyn, PA | New Windsor, MD | United States |
| Population | 2,086 | 1,267 | 329,725,481 |
| Female Population | 46.9% | 50.4% | 50.5% |
| Male Population | 53.1% | 49.6% | 49.5% |
| Median Age | 42.8 | 41.4 | 38.4 |
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| Population - 2010 | 2,160 | 1,395 | 309,327,143 |
| Population - 2000 | 2,287 | 1,303 | 285,036,114 |
| Population - 1990 | 2,263 | 757 | 251,960,433 |
| Pop. 2000 to Now | -10.9% | 7.8% | 15.6% |
| Pop. 1990 to Now | -10.0% | 85.5% | 30.8% |
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| Population Density | 2,633.8 | 1,705.3 | 93.4 |
| Land Area | 0.8 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Jermyn, PA | New Windsor, MD | United States |
| Age 0 to 4 | 4.9% | 3.3% | 5.9% |
| Age 5 to 9 | 6.5% | 5.5% | 6.1% |
| Age 10 to 14 | 4.2% | 6.7% | 6.6% |
| Age 15 to 17 | 4.1% | 4.5% | 3.9% |
| Age 18 to 20 | 1.8% | 3.6% | 4.0% |
| Age 21 to 24 | 4.7% | 4.7% | 5.2% |
| Age 25 to 34 | 10.5% | 13.7% | 13.8% |
| Age 35 to 44 | 15.6% | 13.4% | 12.9% |
| Age 45 to 54 | 13.9% | 15.5% | 12.6% |
| Age 55 to 59 | 6.2% | 9.6% | 6.7% |
| Age 60 to 64 | 9.6% | 5.8% | 6.3% |
| Age 65 to 74 | 10.5% | 7.9% | 9.6% |
| Age 75 to 84 | 4.3% | 5.7% | 4.5% |
| Age 85 and over | 3.2% | 0.0% | 1.9% |
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| Race | | | |
| | Jermyn, PA | New Windsor, MD | United States |
| White | 98.8% | 86.3% | 59.4% |
| Black | 0.7% | 7.2% | 12.2% |
| Asian | 0.0% | 1.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.4% | 1.7% | 3.2% |
| Hispanic | 0.1% | 3.1% | 18.4% |
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| Marriage & Family | | | |
| | Jermyn, PA | New Windsor, MD | United States |
| Married Population | 46.4% | 57.9% | 49.8% |
| Currently Married | 43.2% | 57.4% | 48.0% |
| Married but Separated | 3.2% | 0.6% | 1.8% |
| Single Population | 53.6% | 42.1% | 50.2% |
| Never Married | 32.7% | 25.6% | 33.8% |
| Divorced | 15.1% | 11.8% | 10.8% |
| Widowed | 5.9% | 4.7% | 5.6% |
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| Household Size | 2.12 | 2.52 | 2.60 |
| Households | 980 | 502 | 124,010,992 |
| Family Households | 670 | 373 | 80,755,759 |
| Married couple, w/children | 12.8% | 28.2% | 30.5% |
| Married couple, no children | 43.3% | 54.7% | 42.9% |
| Non Family Households | 310 | 129 | 43,255,233 |
| Single householder, w/children | 27.8% | 13.7% | 15.8% |
| Single householder, no children | 16.1% | 3.5% | 10.8% |