| | Girard, OH | Aliquippa, PA | United States |
| Population | 9,571 | 9,237 | 329,725,481 |
| Female Population | 53.3% | 53.3% | 50.5% |
| Male Population | 46.7% | 46.7% | 49.5% |
| Median Age | 38.1 | 46.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 9,908 | 9,425 | 309,327,143 |
| Population - 2000 | 10,902 | 11,734 | 285,036,114 |
| Population - 1990 | 11,304 | 13,374 | 251,960,433 |
| Pop. 2000 to Now | -16.0% | -25.5% | 15.6% |
| Pop. 1990 to Now | -19.0% | -34.6% | 30.8% |
| space4 | | | |
| Population Density | 1,671.8 | 2,201.4 | 93.4 |
| Land Area | 5.7 | 4.2 | 3,531,905.4 |
| Water Area | 0.5 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Girard, OH | Aliquippa, PA | United States |
| Age 0 to 4 | 8.0% | 4.3% | 5.9% |
| Age 5 to 9 | 6.4% | 6.0% | 6.1% |
| Age 10 to 14 | 5.7% | 5.3% | 6.6% |
| Age 15 to 17 | 2.7% | 2.0% | 3.9% |
| Age 18 to 20 | 3.2% | 2.0% | 4.0% |
| Age 21 to 24 | 5.8% | 6.4% | 5.2% |
| Age 25 to 34 | 14.3% | 10.1% | 13.8% |
| Age 35 to 44 | 10.9% | 12.6% | 12.9% |
| Age 45 to 54 | 11.7% | 11.8% | 12.6% |
| Age 55 to 59 | 5.9% | 6.5% | 6.7% |
| Age 60 to 64 | 8.2% | 10.6% | 6.3% |
| Age 65 to 74 | 11.5% | 11.7% | 9.6% |
| Age 75 to 84 | 3.9% | 6.7% | 4.5% |
| Age 85 and over | 1.8% | 4.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Girard, OH | Aliquippa, PA | United States |
| White | 89.0% | 54.6% | 59.4% |
| Black | 5.1% | 36.8% | 12.2% |
| Asian | 0.0% | 1.1% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.1% | 0.4% |
| Two or More Races | 2.7% | 4.7% | 3.2% |
| Hispanic | 2.9% | 2.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Girard, OH | Aliquippa, PA | United States |
| Married Population | 43.9% | 37.1% | 49.8% |
| Currently Married | 42.1% | 33.4% | 48.0% |
| Married but Separated | 1.8% | 3.7% | 1.8% |
| Single Population | 56.1% | 62.9% | 50.2% |
| Never Married | 35.6% | 44.7% | 33.8% |
| Divorced | 13.4% | 12.1% | 10.8% |
| Widowed | 7.1% | 6.1% | 5.6% |
| space5 | | | |
| Household Size | 2.35 | 2.00 | 2.60 |
| Households | 4,063 | 4,561 | 124,010,992 |
| Family Households | 2,399 | 2,303 | 80,755,759 |
| Married couple, w/children | 26.3% | 7.6% | 30.5% |
| Married couple, no children | 37.7% | 45.6% | 42.9% |
| Non Family Households | 1,664 | 2,258 | 43,255,233 |
| Single householder, w/children | 26.2% | 27.6% | 15.8% |
| Single householder, no children | 9.9% | 19.2% | 10.8% |