| | National Park, NJ | Malvern, AR | United States |
| Population | 3,064 | 10,626 | 329,725,481 |
| Female Population | 48.7% | 42.6% | 50.5% |
| Male Population | 51.3% | 57.4% | 49.5% |
| Median Age | 40.2 | 38.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,037 | 10,627 | 309,327,143 |
| Population - 2000 | 3,205 | 9,021 | 285,036,114 |
| Population - 1990 | 3,413 | 9,256 | 251,960,433 |
| Pop. 2000 to Now | -8.0% | 19.6% | 15.6% |
| Pop. 1990 to Now | -13.6% | 16.6% | 30.8% |
| space4 | | | |
| Population Density | 3,042.7 | 1,238.8 | 93.4 |
| Land Area | 1.0 | 8.6 | 3,531,905.4 |
| Water Area | 0.4 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | National Park, NJ | Malvern, AR | United States |
| Age 0 to 4 | 4.2% | 5.0% | 5.9% |
| Age 5 to 9 | 4.4% | 7.2% | 6.1% |
| Age 10 to 14 | 6.9% | 5.1% | 6.6% |
| Age 15 to 17 | 5.6% | 3.0% | 3.9% |
| Age 18 to 20 | 5.1% | 2.2% | 4.0% |
| Age 21 to 24 | 4.2% | 3.5% | 5.2% |
| Age 25 to 34 | 11.2% | 18.5% | 13.8% |
| Age 35 to 44 | 17.5% | 16.4% | 12.9% |
| Age 45 to 54 | 15.0% | 13.2% | 12.6% |
| Age 55 to 59 | 6.2% | 5.4% | 6.7% |
| Age 60 to 64 | 5.7% | 5.1% | 6.3% |
| Age 65 to 74 | 8.7% | 9.8% | 9.6% |
| Age 75 to 84 | 3.6% | 4.2% | 4.5% |
| Age 85 and over | 1.7% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | National Park, NJ | Malvern, AR | United States |
| White | 90.4% | 61.1% | 59.4% |
| Black | 0.4% | 29.9% | 12.2% |
| Asian | 1.5% | 0.6% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.7% | 3.2% | 3.2% |
| Hispanic | 6.0% | 4.8% | 18.4% |
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| Marriage & Family | | | |
| | National Park, NJ | Malvern, AR | United States |
| Married Population | 49.4% | 39.6% | 49.8% |
| Currently Married | 47.2% | 37.1% | 48.0% |
| Married but Separated | 2.2% | 2.5% | 1.8% |
| Single Population | 50.6% | 60.4% | 50.2% |
| Never Married | 33.8% | 34.3% | 33.8% |
| Divorced | 11.0% | 18.6% | 10.8% |
| Widowed | 5.9% | 7.5% | 5.6% |
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| Household Size | 2.74 | 2.46 | 2.60 |
| Households | 1,110 | 3,484 | 124,010,992 |
| Family Households | 830 | 2,094 | 80,755,759 |
| Married couple, w/children | 27.3% | 23.9% | 30.5% |
| Married couple, no children | 38.4% | 42.3% | 42.9% |
| Non Family Households | 280 | 1,390 | 43,255,233 |
| Single householder, w/children | 18.8% | 19.7% | 15.8% |
| Single householder, no children | 15.4% | 14.1% | 10.8% |