| | Princeton Junction, NJ | North Brunswick, NJ | United States |
| Population | 2,208 | 43,652 | 329,725,481 |
| Female Population | 45.3% | 51.3% | 50.5% |
| Male Population | 54.7% | 48.8% | 49.5% |
| Median Age | 47.9 | 37 | 38.4 |
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| Population - 2010 | 2,308 | 41,448 | 309,327,143 |
| Population - 2000 | 2,382 | 36,287 | 285,036,114 |
| Population - 1990 | 2,362 | 31,287 | 251,960,433 |
| Pop. 2000 to Now | 1.6% | 13.3% | 15.6% |
| Pop. 1990 to Now | 2.5% | 31.4% | 30.8% |
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| Population Density | 1,211.2 | 3,639.2 | 93.4 |
| Land Area | 1.8 | 12.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Princeton Junction, NJ | North Brunswick, NJ | United States |
| Age 0 to 4 | 6.3% | 5.5% | 5.9% |
| Age 5 to 9 | 3.3% | 6.5% | 6.1% |
| Age 10 to 14 | 6.3% | 6.8% | 6.6% |
| Age 15 to 17 | 3.3% | 3.3% | 3.9% |
| Age 18 to 20 | 0.0% | 5.0% | 4.0% |
| Age 21 to 24 | 0.9% | 4.0% | 5.2% |
| Age 25 to 34 | 16.4% | 15.2% | 13.8% |
| Age 35 to 44 | 7.2% | 15.6% | 12.9% |
| Age 45 to 54 | 14.6% | 13.6% | 12.6% |
| Age 55 to 59 | 12.5% | 6.3% | 6.7% |
| Age 60 to 64 | 12.5% | 5.1% | 6.3% |
| Age 65 to 74 | 8.2% | 7.7% | 9.6% |
| Age 75 to 84 | 6.4% | 3.9% | 4.5% |
| Age 85 and over | 2.3% | 1.6% | 1.9% |
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| Race | | | |
| | Princeton Junction, NJ | North Brunswick, NJ | United States |
| White | 70.2% | 31.8% | 59.4% |
| Black | 1.6% | 20.3% | 12.2% |
| Asian | 20.0% | 24.4% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 4.9% | 2.3% | 3.2% |
| Hispanic | 3.4% | 20.9% | 18.4% |
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| Marriage & Family | | | |
| | Princeton Junction, NJ | North Brunswick, NJ | United States |
| Married Population | 72.2% | 54.3% | 49.8% |
| Currently Married | 72.2% | 53.0% | 48.0% |
| Married but Separated | 0.0% | 1.3% | 1.8% |
| Single Population | 27.8% | 45.7% | 50.2% |
| Never Married | 16.3% | 33.4% | 33.8% |
| Divorced | 7.2% | 7.8% | 10.8% |
| Widowed | 4.4% | 4.6% | 5.6% |
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| Household Size | 2.35 | 2.69 | 2.60 |
| Households | 936 | 15,339 | 124,010,992 |
| Family Households | 714 | 11,099 | 80,755,759 |
| Married couple, w/children | 36.0% | 34.5% | 30.5% |
| Married couple, no children | 57.4% | 41.1% | 42.9% |
| Non Family Households | 222 | 4,240 | 43,255,233 |
| Single householder, w/children | 2.5% | 14.1% | 15.8% |
| Single householder, no children | 4.1% | 10.3% | 10.8% |