| | Clementon, NJ | Westville, NJ | United States |
| Population | 5,271 | 4,303 | 329,725,481 |
| Female Population | 51.7% | 50.9% | 50.5% |
| Male Population | 48.3% | 49.2% | 49.5% |
| Median Age | 38.6 | 42.8 | 38.4 |
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| Population - 2010 | 4,977 | 4,287 | 309,327,143 |
| Population - 2000 | 4,986 | 4,500 | 285,036,114 |
| Population - 1990 | 5,601 | 4,573 | 251,960,433 |
| Pop. 2000 to Now | -0.7% | -7.7% | 15.6% |
| Pop. 1990 to Now | -11.6% | -9.2% | 30.8% |
| space4 | | | |
| Population Density | 2,784.5 | 4,206.3 | 93.4 |
| Land Area | 1.9 | 1.0 | 3,531,905.4 |
| Water Area | 0.1 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Clementon, NJ | Westville, NJ | United States |
| Age 0 to 4 | 6.8% | 6.2% | 5.9% |
| Age 5 to 9 | 7.7% | 7.2% | 6.1% |
| Age 10 to 14 | 4.6% | 4.6% | 6.6% |
| Age 15 to 17 | 1.7% | 3.8% | 3.9% |
| Age 18 to 20 | 0.0% | 0.7% | 4.0% |
| Age 21 to 24 | 6.4% | 3.7% | 5.2% |
| Age 25 to 34 | 17.5% | 14.2% | 13.8% |
| Age 35 to 44 | 7.9% | 11.5% | 12.9% |
| Age 45 to 54 | 12.5% | 17.2% | 12.6% |
| Age 55 to 59 | 3.7% | 8.1% | 6.7% |
| Age 60 to 64 | 12.7% | 6.6% | 6.3% |
| Age 65 to 74 | 12.8% | 11.7% | 9.6% |
| Age 75 to 84 | 4.4% | 3.5% | 4.5% |
| Age 85 and over | 1.3% | 1.1% | 1.9% |
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| Race | | | |
| | Clementon, NJ | Westville, NJ | United States |
| White | 58.1% | 74.4% | 59.4% |
| Black | 22.8% | 13.5% | 12.2% |
| Asian | 4.2% | 3.3% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.9% | 0.0% | 0.4% |
| Two or More Races | 0.5% | 1.5% | 3.2% |
| Hispanic | 13.5% | 7.1% | 18.4% |
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| Marriage & Family | | | |
| | Clementon, NJ | Westville, NJ | United States |
| Married Population | 46.9% | 45.8% | 49.8% |
| Currently Married | 43.8% | 41.7% | 48.0% |
| Married but Separated | 3.1% | 4.1% | 1.8% |
| Single Population | 53.1% | 54.2% | 50.2% |
| Never Married | 32.7% | 33.1% | 33.8% |
| Divorced | 15.7% | 13.9% | 10.8% |
| Widowed | 4.8% | 7.1% | 5.6% |
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| Household Size | 2.10 | 2.31 | 2.60 |
| Households | 2,505 | 1,859 | 124,010,992 |
| Family Households | 1,379 | 1,070 | 80,755,759 |
| Married couple, w/children | 29.2% | 23.1% | 30.5% |
| Married couple, no children | 36.6% | 33.1% | 42.9% |
| Non Family Households | 1,126 | 789 | 43,255,233 |
| Single householder, w/children | 10.4% | 22.7% | 15.8% |
| Single householder, no children | 23.7% | 21.1% | 10.8% |