| | Upper Darby, PA | Aldan, PA | United States |
| Population | 84,986 | 4,214 | 329,725,481 |
| Female Population | 51.8% | 51.6% | 50.5% |
| Male Population | 48.2% | 48.4% | 49.5% |
| Median Age | 35.6 | 44.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 82,784 | 4,147 | 309,327,143 |
| Population - 2000 | 81,821 | 4,313 | 285,036,114 |
| Population - 1990 | 81,177 | 4,549 | 251,960,433 |
| Pop. 2000 to Now | 1.3% | -3.8% | 15.6% |
| Pop. 1990 to Now | 2.1% | -8.8% | 30.8% |
| space4 | | | |
| Population Density | 10,860.8 | 7,058.6 | 93.4 |
| Land Area | 7.8 | 0.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Upper Darby, PA | Aldan, PA | United States |
| Age 0 to 4 | 6.7% | 5.8% | 5.9% |
| Age 5 to 9 | 6.3% | 4.3% | 6.1% |
| Age 10 to 14 | 6.2% | 9.1% | 6.6% |
| Age 15 to 17 | 3.7% | 1.0% | 3.9% |
| Age 18 to 20 | 3.2% | 2.6% | 4.0% |
| Age 21 to 24 | 5.6% | 1.8% | 5.2% |
| Age 25 to 34 | 17.1% | 12.3% | 13.8% |
| Age 35 to 44 | 14.1% | 13.9% | 12.9% |
| Age 45 to 54 | 12.6% | 14.5% | 12.6% |
| Age 55 to 59 | 7.0% | 10.5% | 6.7% |
| Age 60 to 64 | 5.2% | 9.4% | 6.3% |
| Age 65 to 74 | 8.0% | 9.8% | 9.6% |
| Age 75 to 84 | 3.1% | 2.8% | 4.5% |
| Age 85 and over | 1.2% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Upper Darby, PA | Aldan, PA | United States |
| White | 43.5% | 46.4% | 59.4% |
| Black | 32.5% | 40.3% | 12.2% |
| Asian | 12.1% | 5.5% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 1.8% | 0.4% |
| Two or More Races | 3.5% | 2.8% | 3.2% |
| Hispanic | 8.0% | 3.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Upper Darby, PA | Aldan, PA | United States |
| Married Population | 43.2% | 56.5% | 49.8% |
| Currently Married | 41.2% | 52.2% | 48.0% |
| Married but Separated | 2.0% | 4.3% | 1.8% |
| Single Population | 56.8% | 43.6% | 50.2% |
| Never Married | 43.1% | 26.7% | 33.8% |
| Divorced | 8.6% | 8.9% | 10.8% |
| Widowed | 5.0% | 7.9% | 5.6% |
| space5 | | | |
| Household Size | 2.56 | 2.49 | 2.60 |
| Households | 33,109 | 1,690 | 124,010,992 |
| Family Households | 21,110 | 1,029 | 80,755,759 |
| Married couple, w/children | 26.9% | 29.5% | 30.5% |
| Married couple, no children | 34.8% | 52.4% | 42.9% |
| Non Family Households | 11,999 | 661 | 43,255,233 |
| Single householder, w/children | 22.3% | 9.1% | 15.8% |
| Single householder, no children | 16.0% | 8.9% | 10.8% |