| | Rostraver, PA | Ligonier, PA | United States |
| Population | 11,352 | 1,411 | 329,725,481 |
| Female Population | 50.1% | 51.9% | 50.5% |
| Male Population | 49.9% | 48.1% | 49.5% |
| Median Age | 47.1 | 52.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 11,342 | 1,568 | 309,327,143 |
| Population - 2000 | 11,634 | 1,695 | 285,036,114 |
| Population - 1990 | 11,224 | 1,638 | 251,960,433 |
| Pop. 2000 to Now | -5.8% | -11.2% | 15.6% |
| Pop. 1990 to Now | -2.4% | -8.1% | 30.8% |
| space4 | | | |
| Population Density | 351.6 | 2,799.6 | 93.4 |
| Land Area | 32.3 | 0.5 | 3,531,905.4 |
| Water Area | 0.7 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Rostraver, PA | Ligonier, PA | United States |
| Age 0 to 4 | 6.7% | 2.7% | 5.9% |
| Age 5 to 9 | 5.1% | 4.0% | 6.1% |
| Age 10 to 14 | 5.1% | 4.3% | 6.6% |
| Age 15 to 17 | 3.0% | 2.0% | 3.9% |
| Age 18 to 20 | 1.9% | 1.8% | 4.0% |
| Age 21 to 24 | 5.0% | 5.2% | 5.2% |
| Age 25 to 34 | 10.0% | 7.7% | 13.8% |
| Age 35 to 44 | 10.6% | 15.5% | 12.9% |
| Age 45 to 54 | 13.3% | 9.2% | 12.6% |
| Age 55 to 59 | 9.5% | 7.3% | 6.7% |
| Age 60 to 64 | 8.2% | 7.4% | 6.3% |
| Age 65 to 74 | 11.6% | 18.2% | 9.6% |
| Age 75 to 84 | 6.3% | 6.3% | 4.5% |
| Age 85 and over | 3.8% | 8.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Rostraver, PA | Ligonier, PA | United States |
| White | 93.8% | 97.8% | 59.4% |
| Black | 1.4% | 0.0% | 12.2% |
| Asian | 0.4% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.8% | 0.0% | 0.4% |
| Two or More Races | 2.8% | 0.6% | 3.2% |
| Hispanic | 0.8% | 1.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Rostraver, PA | Ligonier, PA | United States |
| Married Population | 58.6% | 57.0% | 49.8% |
| Currently Married | 56.5% | 55.1% | 48.0% |
| Married but Separated | 2.1% | 1.9% | 1.8% |
| Single Population | 41.4% | 43.0% | 50.2% |
| Never Married | 24.3% | 23.7% | 33.8% |
| Divorced | 9.3% | 11.5% | 10.8% |
| Widowed | 7.8% | 7.8% | 5.6% |
| space5 | | | |
| Household Size | 2.31 | 1.94 | 2.60 |
| Households | 4,851 | 728 | 124,010,992 |
| Family Households | 3,147 | 400 | 80,755,759 |
| Married couple, w/children | 29.2% | 16.5% | 30.5% |
| Married couple, no children | 52.5% | 63.5% | 42.9% |
| Non Family Households | 1,704 | 328 | 43,255,233 |
| Single householder, w/children | 9.8% | 13.0% | 15.8% |
| Single householder, no children | 8.5% | 7.0% | 10.8% |