| | Delaware township (Northumberland County), PA | Washington township (Gloucester County), NJ | United States |
| Population | 4,320 | 49,127 | 329,725,481 |
| Female Population | 52.3% | 50.4% | 50.5% |
| Male Population | 47.7% | 49.6% | 49.5% |
| Median Age | 39.8 | 42.8 | 38.4 |
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| Population - 2010 | 4,474 | 49,031 | 309,327,143 |
| Population - 2000 | 4,341 | 47,114 | 285,036,114 |
| Population - 1990 | 4,018 | 41,960 | 251,960,433 |
| Pop. 2000 to Now | -0.9% | 2.3% | 15.6% |
| Pop. 1990 to Now | 7.0% | 14.8% | 30.8% |
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| Population Density | 142.5 | 2,297.6 | 93.4 |
| Land Area | 30.3 | 21.4 | 3,531,905.4 |
| Water Area | 1.1 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Delaware township (Northumberland County), PA | Washington township (Gloucester County), NJ | United States |
| Age 0 to 4 | 6.5% | 5.2% | 5.9% |
| Age 5 to 9 | 9.0% | 5.5% | 6.1% |
| Age 10 to 14 | 7.8% | 6.7% | 6.6% |
| Age 15 to 17 | 5.3% | 4.0% | 3.9% |
| Age 18 to 20 | 1.3% | 2.8% | 4.0% |
| Age 21 to 24 | 3.7% | 4.3% | 5.2% |
| Age 25 to 34 | 10.0% | 11.9% | 13.8% |
| Age 35 to 44 | 11.6% | 12.5% | 12.9% |
| Age 45 to 54 | 13.8% | 14.6% | 12.6% |
| Age 55 to 59 | 4.2% | 7.2% | 6.7% |
| Age 60 to 64 | 7.0% | 8.1% | 6.3% |
| Age 65 to 74 | 11.4% | 10.3% | 9.6% |
| Age 75 to 84 | 7.1% | 4.8% | 4.5% |
| Age 85 and over | 1.3% | 2.1% | 1.9% |
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| Race | | | |
| | Delaware township (Northumberland County), PA | Washington township (Gloucester County), NJ | United States |
| White | 96.4% | 84.3% | 59.4% |
| Black | 0.6% | 4.8% | 12.2% |
| Asian | 0.8% | 4.1% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.1% | 0.4% |
| Two or More Races | 1.6% | 1.9% | 3.2% |
| Hispanic | 0.0% | 4.7% | 18.4% |
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| Marriage & Family | | | |
| | Delaware township (Northumberland County), PA | Washington township (Gloucester County), NJ | United States |
| Married Population | 61.1% | 57.6% | 49.8% |
| Currently Married | 58.1% | 56.2% | 48.0% |
| Married but Separated | 3.0% | 1.3% | 1.8% |
| Single Population | 38.9% | 42.4% | 50.2% |
| Never Married | 23.4% | 28.9% | 33.8% |
| Divorced | 7.8% | 7.7% | 10.8% |
| Widowed | 7.7% | 5.8% | 5.6% |
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| Household Size | 2.64 | 2.72 | 2.60 |
| Households | 1,634 | 18,022 | 124,010,992 |
| Family Households | 1,055 | 13,741 | 80,755,759 |
| Married couple, w/children | 41.4% | 32.5% | 30.5% |
| Married couple, no children | 46.4% | 47.6% | 42.9% |
| Non Family Households | 579 | 4,281 | 43,255,233 |
| Single householder, w/children | 10.0% | 8.7% | 15.8% |
| Single householder, no children | 2.2% | 11.3% | 10.8% |