| | Dallas, PA | Mountain Top, PA | United States |
| Population | 2,696 | 11,716 | 329,725,481 |
| Female Population | 52.3% | 51.9% | 50.5% |
| Male Population | 47.7% | 48.1% | 49.5% |
| Median Age | 40.7 | 43.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,814 | 10,560 | 309,327,143 |
| Population - 2000 | 2,557 | 15,269 | 285,036,114 |
| Population - 1990 | 2,567 | 7,811 | 251,960,433 |
| Pop. 2000 to Now | 8.0% | -26.2% | 15.6% |
| Pop. 1990 to Now | 7.6% | 44.3% | 30.8% |
| space4 | | | |
| Population Density | 1,162.6 | 778.8 | 93.4 |
| Land Area | 2.3 | 15.0 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Dallas, PA | Mountain Top, PA | United States |
| Age 0 to 4 | 3.6% | 3.9% | 5.9% |
| Age 5 to 9 | 12.3% | 5.6% | 6.1% |
| Age 10 to 14 | 4.6% | 8.0% | 6.6% |
| Age 15 to 17 | 3.3% | 5.6% | 3.9% |
| Age 18 to 20 | 4.0% | 4.7% | 4.0% |
| Age 21 to 24 | 5.4% | 4.2% | 5.2% |
| Age 25 to 34 | 7.7% | 6.7% | 13.8% |
| Age 35 to 44 | 15.2% | 13.7% | 12.9% |
| Age 45 to 54 | 12.1% | 19.3% | 12.6% |
| Age 55 to 59 | 6.2% | 5.3% | 6.7% |
| Age 60 to 64 | 8.2% | 5.9% | 6.3% |
| Age 65 to 74 | 9.9% | 10.2% | 9.6% |
| Age 75 to 84 | 5.2% | 4.8% | 4.5% |
| Age 85 and over | 2.4% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Dallas, PA | Mountain Top, PA | United States |
| White | 91.1% | 91.8% | 59.4% |
| Black | 2.6% | 0.2% | 12.2% |
| Asian | 0.9% | 3.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 3.2% | 1.7% | 3.2% |
| Hispanic | 2.3% | 2.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Dallas, PA | Mountain Top, PA | United States |
| Married Population | 51.2% | 55.9% | 49.8% |
| Currently Married | 48.9% | 53.8% | 48.0% |
| Married but Separated | 2.4% | 2.1% | 1.8% |
| Single Population | 48.8% | 44.1% | 50.2% |
| Never Married | 28.7% | 29.6% | 33.8% |
| Divorced | 12.4% | 8.4% | 10.8% |
| Widowed | 7.6% | 6.2% | 5.6% |
| space5 | | | |
| Household Size | 2.35 | 2.70 | 2.60 |
| Households | 1,120 | 4,284 | 124,010,992 |
| Family Households | 728 | 3,359 | 80,755,759 |
| Married couple, w/children | 21.0% | 34.5% | 30.5% |
| Married couple, no children | 51.0% | 39.2% | 42.9% |
| Non Family Households | 392 | 925 | 43,255,233 |
| Single householder, w/children | 18.4% | 14.1% | 15.8% |
| Single householder, no children | 9.6% | 12.2% | 10.8% |