| | Cape May, NJ | Twin Rivers, NJ | United States |
| Population | 2,922 | 8,049 | 329,725,481 |
| Female Population | 42.5% | 46.5% | 50.5% |
| Male Population | 57.5% | 53.5% | 49.5% |
| Median Age | 37.1 | 35.2 | 38.4 |
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| Population - 2010 | 3,613 | 7,053 | 309,327,143 |
| Population - 2000 | 4,034 | 7,422 | 285,036,114 |
| Population - 1990 | 4,668 | 7,715 | 251,960,433 |
| Pop. 2000 to Now | -15.6% | -2.1% | 15.6% |
| Pop. 1990 to Now | -27.1% | -5.8% | 30.8% |
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| Population Density | 1,181.6 | 6,372.9 | 93.4 |
| Land Area | 2.5 | 1.3 | 3,531,905.4 |
| Water Area | 0.4 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Cape May, NJ | Twin Rivers, NJ | United States |
| Age 0 to 4 | 6.2% | 8.8% | 5.9% |
| Age 5 to 9 | 4.4% | 4.7% | 6.1% |
| Age 10 to 14 | 2.3% | 6.8% | 6.6% |
| Age 15 to 17 | 2.0% | 2.9% | 3.9% |
| Age 18 to 20 | 8.1% | 3.6% | 4.0% |
| Age 21 to 24 | 7.6% | 8.4% | 5.2% |
| Age 25 to 34 | 16.9% | 14.6% | 13.8% |
| Age 35 to 44 | 8.8% | 13.2% | 12.9% |
| Age 45 to 54 | 5.1% | 13.3% | 12.6% |
| Age 55 to 59 | 2.2% | 6.7% | 6.7% |
| Age 60 to 64 | 10.3% | 6.6% | 6.3% |
| Age 65 to 74 | 14.9% | 6.2% | 9.6% |
| Age 75 to 84 | 8.8% | 2.9% | 4.5% |
| Age 85 and over | 2.3% | 1.3% | 1.9% |
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| Race | | | |
| | Cape May, NJ | Twin Rivers, NJ | United States |
| White | 69.0% | 41.7% | 59.4% |
| Black | 3.4% | 4.1% | 12.2% |
| Asian | 0.0% | 7.6% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.4% | 2.0% | 3.2% |
| Hispanic | 23.1% | 44.6% | 18.4% |
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| Marriage & Family | | | |
| | Cape May, NJ | Twin Rivers, NJ | United States |
| Married Population | 57.0% | 58.8% | 49.8% |
| Currently Married | 56.2% | 58.5% | 48.0% |
| Married but Separated | 0.8% | 0.3% | 1.8% |
| Single Population | 43.0% | 41.2% | 50.2% |
| Never Married | 30.8% | 30.8% | 33.8% |
| Divorced | 7.3% | 6.3% | 10.8% |
| Widowed | 4.9% | 4.0% | 5.6% |
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| Household Size | 2.07 | 3.08 | 2.60 |
| Households | 1,189 | 2,611 | 124,010,992 |
| Family Households | 759 | 2,025 | 80,755,759 |
| Married couple, w/children | 36.9% | 34.6% | 30.5% |
| Married couple, no children | 48.1% | 43.5% | 42.9% |
| Non Family Households | 430 | 586 | 43,255,233 |
| Single householder, w/children | 2.1% | 10.7% | 15.8% |
| Single householder, no children | 12.9% | 11.3% | 10.8% |