| | Lawrenceville, NJ | Carlstadt, NJ | United States |
| Population | 3,661 | 6,358 | 329,725,481 |
| Female Population | 52.2% | 44.6% | 50.5% |
| Male Population | 47.8% | 55.4% | 49.5% |
| Median Age | 49.8 | 40.6 | 38.4 |
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| Population - 2010 | 3,556 | 6,127 | 309,327,143 |
| Population - 2000 | 4,081 | 5,917 | 285,036,114 |
| Population - 1990 | 6,446 | 5,510 | 251,960,433 |
| Pop. 2000 to Now | -6.3% | 3.2% | 15.6% |
| Pop. 1990 to Now | -40.7% | 10.9% | 30.8% |
| space4 | | | |
| Population Density | 3,513.4 | 1,610.8 | 93.4 |
| Land Area | 1.0 | 3.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lawrenceville, NJ | Carlstadt, NJ | United States |
| Age 0 to 4 | 3.4% | 5.6% | 5.9% |
| Age 5 to 9 | 5.2% | 2.1% | 6.1% |
| Age 10 to 14 | 3.9% | 5.0% | 6.6% |
| Age 15 to 17 | 1.4% | 3.2% | 3.9% |
| Age 18 to 20 | 3.1% | 5.8% | 4.0% |
| Age 21 to 24 | 5.6% | 6.9% | 5.2% |
| Age 25 to 34 | 7.9% | 13.6% | 13.8% |
| Age 35 to 44 | 16.0% | 14.0% | 12.9% |
| Age 45 to 54 | 10.0% | 18.0% | 12.6% |
| Age 55 to 59 | 7.0% | 8.4% | 6.7% |
| Age 60 to 64 | 11.5% | 2.0% | 6.3% |
| Age 65 to 74 | 19.5% | 9.7% | 9.6% |
| Age 75 to 84 | 2.6% | 4.2% | 4.5% |
| Age 85 and over | 3.0% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lawrenceville, NJ | Carlstadt, NJ | United States |
| White | 75.9% | 71.8% | 59.4% |
| Black | 3.3% | 0.4% | 12.2% |
| Asian | 7.8% | 8.8% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 1.0% | 3.2% |
| Hispanic | 10.6% | 17.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lawrenceville, NJ | Carlstadt, NJ | United States |
| Married Population | 50.7% | 50.8% | 49.8% |
| Currently Married | 48.6% | 50.5% | 48.0% |
| Married but Separated | 2.1% | 0.2% | 1.8% |
| Single Population | 49.3% | 49.2% | 50.2% |
| Never Married | 29.3% | 38.2% | 33.8% |
| Divorced | 12.9% | 7.6% | 10.8% |
| Widowed | 7.2% | 3.5% | 5.6% |
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| Household Size | 2.03 | 2.64 | 2.60 |
| Households | 1,803 | 2,411 | 124,010,992 |
| Family Households | 1,022 | 1,642 | 80,755,759 |
| Married couple, w/children | 24.4% | 29.7% | 30.5% |
| Married couple, no children | 52.3% | 47.5% | 42.9% |
| Non Family Households | 781 | 769 | 43,255,233 |
| Single householder, w/children | 8.6% | 9.7% | 15.8% |
| Single householder, no children | 14.8% | 13.2% | 10.8% |