| | Dunellen, NJ | Hightstown, NJ | United States |
| Population | 7,580 | 5,855 | 329,725,481 |
| Female Population | 43.7% | 48.2% | 50.5% |
| Male Population | 56.3% | 51.8% | 49.5% |
| Median Age | 38.6 | 45.4 | 38.4 |
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| Population - 2010 | 7,217 | 5,532 | 309,327,143 |
| Population - 2000 | 6,823 | 5,216 | 285,036,114 |
| Population - 1990 | 6,528 | 5,126 | 251,960,433 |
| Pop. 2000 to Now | 4.7% | 1.2% | 15.6% |
| Pop. 1990 to Now | 9.4% | 2.9% | 30.8% |
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| Population Density | 7,137.5 | 4,748.6 | 93.4 |
| Land Area | 1.1 | 1.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Dunellen, NJ | Hightstown, NJ | United States |
| Age 0 to 4 | 7.9% | 3.0% | 5.9% |
| Age 5 to 9 | 5.1% | 4.6% | 6.1% |
| Age 10 to 14 | 6.0% | 3.7% | 6.6% |
| Age 15 to 17 | 6.0% | 0.5% | 3.9% |
| Age 18 to 20 | 1.7% | 2.4% | 4.0% |
| Age 21 to 24 | 6.2% | 4.2% | 5.2% |
| Age 25 to 34 | 9.7% | 19.5% | 13.8% |
| Age 35 to 44 | 16.9% | 11.8% | 12.9% |
| Age 45 to 54 | 9.3% | 16.3% | 12.6% |
| Age 55 to 59 | 8.8% | 4.7% | 6.7% |
| Age 60 to 64 | 9.8% | 12.2% | 6.3% |
| Age 65 to 74 | 7.6% | 11.0% | 9.6% |
| Age 75 to 84 | 3.6% | 4.7% | 4.5% |
| Age 85 and over | 1.4% | 1.5% | 1.9% |
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| Race | | | |
| | Dunellen, NJ | Hightstown, NJ | United States |
| White | 42.5% | 63.8% | 59.4% |
| Black | 8.5% | 2.9% | 12.2% |
| Asian | 5.2% | 3.5% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.3% | 0.4% |
| Two or More Races | 0.7% | 1.2% | 3.2% |
| Hispanic | 42.8% | 28.3% | 18.4% |
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| Marriage & Family | | | |
| | Dunellen, NJ | Hightstown, NJ | United States |
| Married Population | 48.3% | 61.5% | 49.8% |
| Currently Married | 46.6% | 60.5% | 48.0% |
| Married but Separated | 1.7% | 1.1% | 1.8% |
| Single Population | 51.7% | 38.5% | 50.2% |
| Never Married | 38.8% | 28.3% | 33.8% |
| Divorced | 7.6% | 8.1% | 10.8% |
| Widowed | 5.3% | 2.1% | 5.6% |
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| Household Size | 3.01 | 2.70 | 2.60 |
| Households | 2,508 | 2,135 | 124,010,992 |
| Family Households | 1,854 | 1,689 | 80,755,759 |
| Married couple, w/children | 32.1% | 25.5% | 30.5% |
| Married couple, no children | 36.5% | 67.0% | 42.9% |
| Non Family Households | 654 | 446 | 43,255,233 |
| Single householder, w/children | 11.4% | 2.8% | 15.8% |
| Single householder, no children | 20.0% | 4.7% | 10.8% |