| | Piscataway, NJ | Passaic, NJ | United States |
| Population | 60,602 | 70,308 | 329,725,481 |
| Female Population | 49.9% | 51.2% | 50.5% |
| Male Population | 50.1% | 48.9% | 49.5% |
| Median Age | 33.7 | 30 | 38.4 |
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| Population - 2010 | 56,011 | 69,800 | 309,327,143 |
| Population - 2000 | 50,482 | 67,861 | 285,036,114 |
| Population - 1990 | 47,089 | 58,041 | 251,960,433 |
| Pop. 2000 to Now | 13.2% | 2.2% | 15.6% |
| Pop. 1990 to Now | 21.4% | 19.5% | 30.8% |
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| Population Density | 3,216.8 | 22,441.1 | 93.4 |
| Land Area | 18.8 | 3.1 | 3,531,905.4 |
| Water Area | 0.2 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Piscataway, NJ | Passaic, NJ | United States |
| Age 0 to 4 | 4.4% | 8.8% | 5.9% |
| Age 5 to 9 | 4.6% | 9.0% | 6.1% |
| Age 10 to 14 | 5.2% | 9.4% | 6.6% |
| Age 15 to 17 | 3.5% | 5.1% | 3.9% |
| Age 18 to 20 | 12.0% | 5.7% | 4.0% |
| Age 21 to 24 | 8.1% | 5.7% | 5.2% |
| Age 25 to 34 | 13.7% | 13.7% | 13.8% |
| Age 35 to 44 | 13.3% | 13.9% | 12.9% |
| Age 45 to 54 | 11.2% | 11.7% | 12.6% |
| Age 55 to 59 | 6.1% | 4.5% | 6.7% |
| Age 60 to 64 | 6.2% | 4.1% | 6.3% |
| Age 65 to 74 | 7.1% | 5.4% | 9.6% |
| Age 75 to 84 | 3.5% | 2.2% | 4.5% |
| Age 85 and over | 1.0% | 1.0% | 1.9% |
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| Race | | | |
| | Piscataway, NJ | Passaic, NJ | United States |
| White | 25.7% | 15.7% | 59.4% |
| Black | 18.6% | 6.4% | 12.2% |
| Asian | 37.0% | 3.6% | 5.6% |
| Native American | 0.2% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.3% | 0.4% |
| Two or More Races | 3.0% | 0.4% | 3.2% |
| Hispanic | 14.9% | 73.4% | 18.4% |
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| Marriage & Family | | | |
| | Piscataway, NJ | Passaic, NJ | United States |
| Married Population | 47.3% | 37.3% | 49.8% |
| Currently Married | 46.1% | 33.5% | 48.0% |
| Married but Separated | 1.1% | 3.9% | 1.8% |
| Single Population | 52.7% | 62.7% | 50.2% |
| Never Married | 43.7% | 51.4% | 33.8% |
| Divorced | 5.4% | 7.6% | 10.8% |
| Widowed | 3.7% | 3.7% | 5.6% |
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| Household Size | 3.03 | 3.46 | 2.60 |
| Households | 16,999 | 20,217 | 124,010,992 |
| Family Households | 12,918 | 15,515 | 80,755,759 |
| Married couple, w/children | 36.2% | 28.6% | 30.5% |
| Married couple, no children | 39.4% | 18.5% | 42.9% |
| Non Family Households | 4,081 | 4,702 | 43,255,233 |
| Single householder, w/children | 9.9% | 35.3% | 15.8% |
| Single householder, no children | 14.5% | 17.6% | 10.8% |