| | Mount Hermon, VA | Salem, VA | United States |
| Population | 4,242 | 25,335 | 329,725,481 |
| Female Population | 53.4% | 52.4% | 50.5% |
| Male Population | 46.6% | 47.6% | 49.5% |
| Median Age | 48.9 | 40.8 | 38.4 |
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| Population - 2010 | 3,940 | 24,897 | 309,327,143 |
| Population - 2000 | 3,376 | 24,747 | 285,036,114 |
| Population - 1990 | 2,588 | 23,756 | 251,960,433 |
| Pop. 2000 to Now | 20.3% | 2.4% | 15.6% |
| Pop. 1990 to Now | 56.9% | 6.7% | 30.8% |
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| Population Density | 792.2 | 1,745.1 | 93.4 |
| Land Area | 5.4 | 14.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Mount Hermon, VA | Salem, VA | United States |
| Age 0 to 4 | 3.4% | 4.1% | 5.9% |
| Age 5 to 9 | 2.2% | 5.3% | 6.1% |
| Age 10 to 14 | 3.3% | 5.7% | 6.6% |
| Age 15 to 17 | 2.1% | 3.9% | 3.9% |
| Age 18 to 20 | 8.5% | 7.2% | 4.0% |
| Age 21 to 24 | 2.8% | 6.2% | 5.2% |
| Age 25 to 34 | 7.2% | 11.3% | 13.8% |
| Age 35 to 44 | 12.4% | 11.7% | 12.9% |
| Age 45 to 54 | 19.6% | 12.1% | 12.6% |
| Age 55 to 59 | 9.5% | 6.2% | 6.7% |
| Age 60 to 64 | 8.0% | 7.6% | 6.3% |
| Age 65 to 74 | 11.8% | 10.7% | 9.6% |
| Age 75 to 84 | 8.1% | 5.2% | 4.5% |
| Age 85 and over | 1.1% | 2.9% | 1.9% |
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| Race | | | |
| | Mount Hermon, VA | Salem, VA | United States |
| White | 82.1% | 84.2% | 59.4% |
| Black | 15.7% | 7.1% | 12.2% |
| Asian | 1.1% | 1.9% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.8% | 0.4% |
| Two or More Races | 1.2% | 2.3% | 3.2% |
| Hispanic | 0.0% | 3.6% | 18.4% |
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| Marriage & Family | | | |
| | Mount Hermon, VA | Salem, VA | United States |
| Married Population | 59.8% | 47.8% | 49.8% |
| Currently Married | 55.9% | 46.4% | 48.0% |
| Married but Separated | 3.9% | 1.4% | 1.8% |
| Single Population | 40.2% | 52.2% | 50.2% |
| Never Married | 25.0% | 32.7% | 33.8% |
| Divorced | 9.4% | 12.8% | 10.8% |
| Widowed | 5.8% | 6.7% | 5.6% |
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| Household Size | 2.46 | 2.29 | 2.60 |
| Households | 1,724 | 9,971 | 124,010,992 |
| Family Households | 1,310 | 6,568 | 80,755,759 |
| Married couple, w/children | 13.5% | 25.6% | 30.5% |
| Married couple, no children | 69.9% | 46.0% | 42.9% |
| Non Family Households | 414 | 3,403 | 43,255,233 |
| Single householder, w/children | 12.2% | 18.3% | 15.8% |
| Single householder, no children | 4.4% | 10.1% | 10.8% |