| | Milltown, NJ | Jamesburg, NJ | United States |
| Population | 7,019 | 5,784 | 329,725,481 |
| Female Population | 55.2% | 47.2% | 50.5% |
| Male Population | 44.8% | 52.8% | 49.5% |
| Median Age | 41.3 | 37.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,891 | 5,858 | 309,327,143 |
| Population - 2000 | 7,000 | 6,025 | 285,036,114 |
| Population - 1990 | 6,968 | 5,294 | 251,960,433 |
| Pop. 2000 to Now | -1.3% | -3.5% | 15.6% |
| Pop. 1990 to Now | -0.9% | 9.9% | 30.8% |
| space4 | | | |
| Population Density | 4,516.7 | 6,557.8 | 93.4 |
| Land Area | 1.6 | 0.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Milltown, NJ | Jamesburg, NJ | United States |
| Age 0 to 4 | 6.6% | 4.3% | 5.9% |
| Age 5 to 9 | 5.2% | 7.4% | 6.1% |
| Age 10 to 14 | 8.5% | 10.2% | 6.6% |
| Age 15 to 17 | 3.6% | 2.1% | 3.9% |
| Age 18 to 20 | 1.1% | 4.2% | 4.0% |
| Age 21 to 24 | 2.8% | 3.1% | 5.2% |
| Age 25 to 34 | 11.2% | 16.0% | 13.8% |
| Age 35 to 44 | 15.3% | 17.7% | 12.9% |
| Age 45 to 54 | 12.3% | 11.4% | 12.6% |
| Age 55 to 59 | 9.9% | 6.9% | 6.7% |
| Age 60 to 64 | 9.4% | 3.5% | 6.3% |
| Age 65 to 74 | 8.2% | 9.0% | 9.6% |
| Age 75 to 84 | 3.3% | 3.5% | 4.5% |
| Age 85 and over | 2.6% | 0.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Milltown, NJ | Jamesburg, NJ | United States |
| White | 82.2% | 63.3% | 59.4% |
| Black | 2.8% | 2.7% | 12.2% |
| Asian | 4.2% | 5.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.8% | 0.4% |
| Two or More Races | 3.6% | 2.5% | 3.2% |
| Hispanic | 7.0% | 25.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Milltown, NJ | Jamesburg, NJ | United States |
| Married Population | 56.3% | 53.0% | 49.8% |
| Currently Married | 54.8% | 52.2% | 48.0% |
| Married but Separated | 1.5% | 0.8% | 1.8% |
| Single Population | 43.7% | 47.0% | 50.2% |
| Never Married | 21.0% | 34.3% | 33.8% |
| Divorced | 14.3% | 6.1% | 10.8% |
| Widowed | 8.4% | 6.6% | 5.6% |
| space5 | | | |
| Household Size | 2.77 | 2.61 | 2.60 |
| Households | 2,529 | 2,206 | 124,010,992 |
| Family Households | 1,855 | 1,408 | 80,755,759 |
| Married couple, w/children | 34.7% | 44.2% | 30.5% |
| Married couple, no children | 36.1% | 34.4% | 42.9% |
| Non Family Households | 674 | 798 | 43,255,233 |
| Single householder, w/children | 12.2% | 9.2% | 15.8% |
| Single householder, no children | 17.0% | 12.2% | 10.8% |