| | Bellevue, PA | Aspinwall, PA | United States |
| Population | 8,287 | 2,901 | 329,725,481 |
| Female Population | 52.6% | 54.5% | 50.5% |
| Male Population | 47.4% | 45.5% | 49.5% |
| Median Age | 35.3 | 35.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 8,352 | 2,777 | 309,327,143 |
| Population - 2000 | 8,770 | 2,960 | 285,036,114 |
| Population - 1990 | 9,126 | 2,880 | 251,960,433 |
| Pop. 2000 to Now | -9.0% | -10.4% | 15.6% |
| Pop. 1990 to Now | -12.6% | -7.9% | 30.8% |
| space4 | | | |
| Population Density | 8,213.1 | 8,288.6 | 93.4 |
| Land Area | 1.0 | 0.4 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Bellevue, PA | Aspinwall, PA | United States |
| Age 0 to 4 | 5.4% | 12.5% | 5.9% |
| Age 5 to 9 | 4.0% | 6.5% | 6.1% |
| Age 10 to 14 | 3.3% | 7.5% | 6.6% |
| Age 15 to 17 | 2.1% | 1.4% | 3.9% |
| Age 18 to 20 | 0.5% | 0.4% | 4.0% |
| Age 21 to 24 | 5.7% | 2.4% | 5.2% |
| Age 25 to 34 | 28.8% | 16.1% | 13.8% |
| Age 35 to 44 | 14.3% | 18.8% | 12.9% |
| Age 45 to 54 | 8.3% | 9.9% | 12.6% |
| Age 55 to 59 | 5.7% | 5.1% | 6.7% |
| Age 60 to 64 | 6.6% | 5.0% | 6.3% |
| Age 65 to 74 | 9.4% | 10.2% | 9.6% |
| Age 75 to 84 | 3.4% | 2.5% | 4.5% |
| Age 85 and over | 2.5% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Bellevue, PA | Aspinwall, PA | United States |
| White | 80.4% | 82.2% | 59.4% |
| Black | 12.0% | 4.0% | 12.2% |
| Asian | 0.3% | 12.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 4.9% | 0.1% | 3.2% |
| Hispanic | 2.2% | 1.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Bellevue, PA | Aspinwall, PA | United States |
| Married Population | 36.8% | 53.9% | 49.8% |
| Currently Married | 35.5% | 52.7% | 48.0% |
| Married but Separated | 1.3% | 1.2% | 1.8% |
| Single Population | 63.2% | 46.1% | 50.2% |
| Never Married | 47.8% | 29.3% | 33.8% |
| Divorced | 9.5% | 13.0% | 10.8% |
| Widowed | 5.9% | 3.8% | 5.6% |
| space5 | | | |
| Household Size | 1.89 | 2.34 | 2.60 |
| Households | 4,337 | 1,239 | 124,010,992 |
| Family Households | 1,687 | 763 | 80,755,759 |
| Married couple, w/children | 28.4% | 41.4% | 30.5% |
| Married couple, no children | 44.8% | 31.3% | 42.9% |
| Non Family Households | 2,650 | 476 | 43,255,233 |
| Single householder, w/children | 13.0% | 16.8% | 15.8% |
| Single householder, no children | 13.8% | 10.5% | 10.8% |