| | Salem, NJ | Millville, NJ | United States |
| Population | 5,237 | 27,946 | 329,725,481 |
| Female Population | 56.4% | 52.4% | 50.5% |
| Male Population | 43.6% | 47.6% | 49.5% |
| Median Age | 32.5 | 44.3 | 38.4 |
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| Population - 2010 | 5,128 | 28,497 | 309,327,143 |
| Population - 2000 | 5,857 | 26,847 | 285,036,114 |
| Population - 1990 | 6,883 | 25,992 | 251,960,433 |
| Pop. 2000 to Now | -19.5% | 0.7% | 15.6% |
| Pop. 1990 to Now | -31.5% | 4.0% | 30.8% |
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| Population Density | 2,234.2 | 665.4 | 93.4 |
| Land Area | 2.3 | 42.0 | 3,531,905.4 |
| Water Area | 0.5 | 2.5 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Salem, NJ | Millville, NJ | United States |
| Age 0 to 4 | 11.9% | 4.7% | 5.9% |
| Age 5 to 9 | 11.0% | 5.7% | 6.1% |
| Age 10 to 14 | 6.2% | 7.7% | 6.6% |
| Age 15 to 17 | 2.8% | 3.1% | 3.9% |
| Age 18 to 20 | 1.5% | 3.4% | 4.0% |
| Age 21 to 24 | 4.3% | 4.6% | 5.2% |
| Age 25 to 34 | 15.2% | 11.2% | 13.8% |
| Age 35 to 44 | 11.9% | 10.4% | 12.9% |
| Age 45 to 54 | 7.4% | 17.7% | 12.6% |
| Age 55 to 59 | 5.2% | 7.3% | 6.7% |
| Age 60 to 64 | 6.5% | 6.3% | 6.3% |
| Age 65 to 74 | 9.6% | 11.1% | 9.6% |
| Age 75 to 84 | 4.2% | 5.2% | 4.5% |
| Age 85 and over | 2.3% | 1.6% | 1.9% |
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| Race | | | |
| | Salem, NJ | Millville, NJ | United States |
| White | 23.8% | 58.4% | 59.4% |
| Black | 63.1% | 15.4% | 12.2% |
| Asian | 0.5% | 2.4% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 2.1% | 5.7% | 3.2% |
| Hispanic | 10.5% | 17.8% | 18.4% |
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| Marriage & Family | | | |
| | Salem, NJ | Millville, NJ | United States |
| Married Population | 27.3% | 46.3% | 49.8% |
| Currently Married | 23.3% | 43.6% | 48.0% |
| Married but Separated | 4.0% | 2.7% | 1.8% |
| Single Population | 72.7% | 53.7% | 50.2% |
| Never Married | 49.2% | 35.3% | 33.8% |
| Divorced | 12.1% | 11.1% | 10.8% |
| Widowed | 11.4% | 7.3% | 5.6% |
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| Household Size | 2.39 | 2.33 | 2.60 |
| Households | 2,176 | 11,887 | 124,010,992 |
| Family Households | 1,162 | 7,212 | 80,755,759 |
| Married couple, w/children | 14.6% | 22.4% | 30.5% |
| Married couple, no children | 20.2% | 42.7% | 42.9% |
| Non Family Households | 1,014 | 4,675 | 43,255,233 |
| Single householder, w/children | 50.2% | 21.4% | 15.8% |
| Single householder, no children | 15.0% | 13.5% | 10.8% |