| | Belford, NJ | Charleroi, PA | United States |
| Population | 2,027 | 4,215 | 329,725,481 |
| Female Population | 50.1% | 50.6% | 50.5% |
| Male Population | 49.9% | 49.4% | 49.5% |
| Median Age | 35.7 | 40.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,396 | 4,095 | 309,327,143 |
| Population - 2000 | 1,340 | 4,871 | 285,036,114 |
| Population - 1990 | 1,755 | 5,014 | 251,960,433 |
| Pop. 2000 to Now | 28.9% | -20.2% | 15.6% |
| Pop. 1990 to Now | -1.6% | -22.5% | 30.8% |
| space4 | | | |
| Population Density | 1,610.0 | 5,531.5 | 93.4 |
| Land Area | 1.3 | 0.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Belford, NJ | Charleroi, PA | United States |
| Age 0 to 4 | 7.0% | 7.9% | 5.9% |
| Age 5 to 9 | 5.8% | 9.5% | 6.1% |
| Age 10 to 14 | 7.0% | 3.7% | 6.6% |
| Age 15 to 17 | 9.3% | 3.3% | 3.9% |
| Age 18 to 20 | 7.5% | 4.4% | 4.0% |
| Age 21 to 24 | 1.1% | 3.4% | 5.2% |
| Age 25 to 34 | 12.0% | 10.1% | 13.8% |
| Age 35 to 44 | 11.5% | 13.5% | 12.9% |
| Age 45 to 54 | 16.3% | 13.0% | 12.6% |
| Age 55 to 59 | 9.4% | 5.9% | 6.7% |
| Age 60 to 64 | 4.9% | 9.1% | 6.3% |
| Age 65 to 74 | 5.7% | 8.7% | 9.6% |
| Age 75 to 84 | 1.9% | 5.4% | 4.5% |
| Age 85 and over | 0.5% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Belford, NJ | Charleroi, PA | United States |
| White | 83.3% | 82.1% | 59.4% |
| Black | 0.6% | 6.6% | 12.2% |
| Asian | 0.4% | 1.0% | 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 | 4.3% | 8.6% | 3.2% |
| Hispanic | 11.3% | 1.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Belford, NJ | Charleroi, PA | United States |
| Married Population | 56.9% | 34.2% | 49.8% |
| Currently Married | 56.2% | 30.4% | 48.0% |
| Married but Separated | 0.6% | 3.7% | 1.8% |
| Single Population | 43.1% | 65.8% | 50.2% |
| Never Married | 33.9% | 38.8% | 33.8% |
| Divorced | 7.1% | 18.2% | 10.8% |
| Widowed | 2.1% | 8.8% | 5.6% |
| space5 | | | |
| Household Size | 3.26 | 2.39 | 2.60 |
| Households | 621 | 1,741 | 124,010,992 |
| Family Households | 475 | 867 | 80,755,759 |
| Married couple, w/children | 52.4% | 19.7% | 30.5% |
| Married couple, no children | 37.3% | 36.6% | 42.9% |
| Non Family Households | 146 | 874 | 43,255,233 |
| Single householder, w/children | 2.3% | 29.0% | 15.8% |
| Single householder, no children | 8.0% | 14.8% | 10.8% |