| | Hermitage, PA | La Plata, MD | United States |
| Population | 16,240 | 10,054 | 329,725,481 |
| Female Population | 51.5% | 48.1% | 50.5% |
| Male Population | 48.5% | 52.0% | 49.5% |
| Median Age | 49.2 | 42.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 16,420 | 8,805 | 309,327,143 |
| Population - 2000 | 16,157 | 6,551 | 285,036,114 |
| Population - 1990 | 15,300 | 5,841 | 251,960,433 |
| Pop. 2000 to Now | -4.3% | 49.6% | 15.6% |
| Pop. 1990 to Now | 1.1% | 67.8% | 30.8% |
| space4 | | | |
| Population Density | 551.1 | 1,352.8 | 93.4 |
| Land Area | 29.5 | 7.4 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hermitage, PA | La Plata, MD | United States |
| Age 0 to 4 | 4.1% | 4.2% | 5.9% |
| Age 5 to 9 | 5.2% | 5.2% | 6.1% |
| Age 10 to 14 | 5.3% | 8.0% | 6.6% |
| Age 15 to 17 | 3.7% | 3.5% | 3.9% |
| Age 18 to 20 | 2.5% | 3.7% | 4.0% |
| Age 21 to 24 | 2.2% | 4.5% | 5.2% |
| Age 25 to 34 | 11.3% | 10.1% | 13.8% |
| Age 35 to 44 | 10.2% | 13.5% | 12.9% |
| Age 45 to 54 | 12.4% | 15.7% | 12.6% |
| Age 55 to 59 | 8.1% | 11.2% | 6.7% |
| Age 60 to 64 | 8.2% | 5.0% | 6.3% |
| Age 65 to 74 | 13.2% | 9.2% | 9.6% |
| Age 75 to 84 | 7.7% | 4.7% | 4.5% |
| Age 85 and over | 5.9% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hermitage, PA | La Plata, MD | United States |
| White | 89.0% | 58.2% | 59.4% |
| Black | 5.2% | 28.7% | 12.2% |
| Asian | 1.3% | 4.5% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 2.0% | 3.5% | 3.2% |
| Hispanic | 2.0% | 5.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hermitage, PA | La Plata, MD | United States |
| Married Population | 55.0% | 48.5% | 49.8% |
| Currently Married | 54.0% | 45.9% | 48.0% |
| Married but Separated | 1.0% | 2.6% | 1.8% |
| Single Population | 45.0% | 51.5% | 50.2% |
| Never Married | 23.2% | 31.9% | 33.8% |
| Divorced | 9.8% | 11.2% | 10.8% |
| Widowed | 11.9% | 8.4% | 5.6% |
| space5 | | | |
| Household Size | 2.11 | 2.68 | 2.60 |
| Households | 7,570 | 3,448 | 124,010,992 |
| Family Households | 4,515 | 2,237 | 80,755,759 |
| Married couple, w/children | 25.9% | 40.3% | 30.5% |
| Married couple, no children | 53.6% | 37.1% | 42.9% |
| Non Family Households | 3,055 | 1,211 | 43,255,233 |
| Single householder, w/children | 11.7% | 14.6% | 15.8% |
| Single householder, no children | 8.8% | 8.0% | 10.8% |