| | Blackwood, NJ | Elgin, PA | United States |
| Population | 4,477 | 223 | 329,725,481 |
| Female Population | 51.5% | 42.6% | 50.5% |
| Male Population | 48.5% | 57.4% | 49.5% |
| Median Age | 39 | 54.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,026 | 218 | 309,327,143 |
| Population - 2000 | 4,692 | 236 | 285,036,114 |
| Population - 1990 | 5,120 | 229 | 251,960,433 |
| Pop. 2000 to Now | 1.9% | -13.6% | 15.6% |
| Pop. 1990 to Now | -6.6% | -10.9% | 30.8% |
| space4 | | | |
| Population Density | 3,669.7 | 151.3 | 93.4 |
| Land Area | 1.2 | 1.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Blackwood, NJ | Elgin, PA | United States |
| Age 0 to 4 | 5.6% | 2.2% | 5.9% |
| Age 5 to 9 | 6.5% | 5.4% | 6.1% |
| Age 10 to 14 | 5.3% | 3.6% | 6.6% |
| Age 15 to 17 | 4.5% | 2.2% | 3.9% |
| Age 18 to 20 | 2.3% | 0.9% | 4.0% |
| Age 21 to 24 | 3.8% | 2.2% | 5.2% |
| Age 25 to 34 | 16.1% | 10.8% | 13.8% |
| Age 35 to 44 | 10.3% | 6.7% | 12.9% |
| Age 45 to 54 | 13.4% | 21.5% | 12.6% |
| Age 55 to 59 | 9.2% | 4.5% | 6.7% |
| Age 60 to 64 | 6.7% | 4.0% | 6.3% |
| Age 65 to 74 | 10.1% | 15.2% | 9.6% |
| Age 75 to 84 | 4.6% | 19.7% | 4.5% |
| Age 85 and over | 1.5% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Blackwood, NJ | Elgin, PA | United States |
| White | 79.7% | 96.4% | 59.4% |
| Black | 4.8% | 0.9% | 12.2% |
| Asian | 1.9% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.5% | 0.0% | 3.2% |
| Hispanic | 12.0% | 2.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Blackwood, NJ | Elgin, PA | United States |
| Married Population | 53.8% | 70.7% | 49.8% |
| Currently Married | 51.5% | 57.1% | 48.0% |
| Married but Separated | 2.2% | 13.6% | 1.8% |
| Single Population | 46.2% | 29.3% | 50.2% |
| Never Married | 30.3% | 14.6% | 33.8% |
| Divorced | 10.2% | 7.6% | 10.8% |
| Widowed | 5.7% | 7.1% | 5.6% |
| space5 | | | |
| Household Size | 2.75 | 2.90 | 2.60 |
| Households | 1,628 | 77 | 124,010,992 |
| Family Households | 1,152 | 62 | 80,755,759 |
| Married couple, w/children | 29.7% | 19.4% | 30.5% |
| Married couple, no children | 44.4% | 66.1% | 42.9% |
| Non Family Households | 476 | 15 | 43,255,233 |
| Single householder, w/children | 14.1% | 9.7% | 15.8% |
| Single householder, no children | 11.7% | 4.8% | 10.8% |