| | Branchville, NJ | Long Neck, DE | United States |
| Population | 839 | 3,022 | 329,725,481 |
| Female Population | 43.2% | 58.3% | 50.5% |
| Male Population | 56.9% | 41.7% | 49.5% |
| Median Age | 45.2 | 61.5 | 38.4 |
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| Population - 2010 | 836 | 2,220 | 309,327,143 |
| Population - 2000 | 845 | 1,629 | 285,036,114 |
| Population - 1990 | 851 | 886 | 251,960,433 |
| Pop. 2000 to Now | -8.3% | 87.5% | 15.6% |
| Pop. 1990 to Now | -8.9% | 244.8% | 30.8% |
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| Population Density | 1,417.2 | 1,215.1 | 93.4 |
| Land Area | 0.6 | 2.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Branchville, NJ | Long Neck, DE | United States |
| Age 0 to 4 | 4.6% | 1.9% | 5.9% |
| Age 5 to 9 | 3.8% | 2.0% | 6.1% |
| Age 10 to 14 | 5.7% | 4.4% | 6.6% |
| Age 15 to 17 | 1.4% | 3.9% | 3.9% |
| Age 18 to 20 | 3.1% | 0.4% | 4.0% |
| Age 21 to 24 | 10.7% | 1.0% | 5.2% |
| Age 25 to 34 | 3.1% | 7.0% | 13.8% |
| Age 35 to 44 | 16.2% | 8.7% | 12.9% |
| Age 45 to 54 | 15.5% | 5.8% | 12.6% |
| Age 55 to 59 | 6.6% | 11.8% | 6.7% |
| Age 60 to 64 | 9.8% | 13.7% | 6.3% |
| Age 65 to 74 | 13.5% | 28.4% | 9.6% |
| Age 75 to 84 | 2.0% | 10.1% | 4.5% |
| Age 85 and over | 3.9% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Branchville, NJ | Long Neck, DE | United States |
| White | 94.5% | 93.0% | 59.4% |
| Black | 2.4% | 2.7% | 12.2% |
| Asian | 0.0% | 0.3% | 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 | 0.6% | 2.2% | 3.2% |
| Hispanic | 2.5% | 1.7% | 18.4% |
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| Marriage & Family | | | |
| | Branchville, NJ | Long Neck, DE | United States |
| Married Population | 63.2% | 64.6% | 49.8% |
| Currently Married | 62.4% | 63.2% | 48.0% |
| Married but Separated | 0.8% | 1.4% | 1.8% |
| Single Population | 36.8% | 35.4% | 50.2% |
| Never Married | 29.2% | 13.5% | 33.8% |
| Divorced | 5.7% | 12.3% | 10.8% |
| Widowed | 1.9% | 9.6% | 5.6% |
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| Household Size | 2.54 | 1.89 | 2.60 |
| Households | 323 | 1,596 | 124,010,992 |
| Family Households | 243 | 906 | 80,755,759 |
| Married couple, w/children | 30.5% | 16.4% | 30.5% |
| Married couple, no children | 59.7% | 72.8% | 42.9% |
| Non Family Households | 80 | 690 | 43,255,233 |
| Single householder, w/children | 5.4% | 4.4% | 15.8% |
| Single householder, no children | 4.5% | 6.3% | 10.8% |