| | Etna, PA | Dormont, PA | United States |
| Population | 3,426 | 8,255 | 329,725,481 |
| Female Population | 48.4% | 47.3% | 50.5% |
| Male Population | 51.6% | 52.7% | 49.5% |
| Median Age | 38.5 | 37.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,441 | 8,601 | 309,327,143 |
| Population - 2000 | 3,924 | 9,305 | 285,036,114 |
| Population - 1990 | 4,200 | 9,772 | 251,960,433 |
| Pop. 2000 to Now | -16.3% | -11.6% | 15.6% |
| Pop. 1990 to Now | -21.8% | -15.8% | 30.8% |
| space4 | | | |
| Population Density | 4,693.2 | 10,861.8 | 93.4 |
| Land Area | 0.7 | 0.8 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Etna, PA | Dormont, PA | United States |
| Age 0 to 4 | 5.8% | 4.9% | 5.9% |
| Age 5 to 9 | 5.9% | 5.0% | 6.1% |
| Age 10 to 14 | 7.6% | 3.2% | 6.6% |
| Age 15 to 17 | 1.1% | 2.8% | 3.9% |
| Age 18 to 20 | 4.3% | 1.7% | 4.0% |
| Age 21 to 24 | 3.1% | 4.6% | 5.2% |
| Age 25 to 34 | 17.5% | 23.4% | 13.8% |
| Age 35 to 44 | 13.7% | 15.6% | 12.9% |
| Age 45 to 54 | 10.2% | 12.1% | 12.6% |
| Age 55 to 59 | 7.7% | 5.9% | 6.7% |
| Age 60 to 64 | 7.2% | 6.3% | 6.3% |
| Age 65 to 74 | 7.8% | 9.2% | 9.6% |
| Age 75 to 84 | 5.3% | 3.6% | 4.5% |
| Age 85 and over | 2.9% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Etna, PA | Dormont, PA | United States |
| White | 87.3% | 90.7% | 59.4% |
| Black | 3.4% | 2.1% | 12.2% |
| Asian | 4.2% | 1.1% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 3.2% | 2.3% | 3.2% |
| Hispanic | 2.0% | 3.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Etna, PA | Dormont, PA | United States |
| Married Population | 43.5% | 40.7% | 49.8% |
| Currently Married | 36.9% | 39.5% | 48.0% |
| Married but Separated | 6.6% | 1.3% | 1.8% |
| Single Population | 56.5% | 59.3% | 50.2% |
| Never Married | 35.6% | 44.1% | 33.8% |
| Divorced | 16.6% | 10.5% | 10.8% |
| Widowed | 4.3% | 4.7% | 5.6% |
| space5 | | | |
| Household Size | 2.13 | 1.96 | 2.60 |
| Households | 1,607 | 4,189 | 124,010,992 |
| Family Households | 863 | 1,856 | 80,755,759 |
| Married couple, w/children | 23.3% | 25.9% | 30.5% |
| Married couple, no children | 36.0% | 49.4% | 42.9% |
| Non Family Households | 744 | 2,333 | 43,255,233 |
| Single householder, w/children | 21.3% | 13.0% | 15.8% |
| Single householder, no children | 19.4% | 11.8% | 10.8% |