| | Blackstone, VA | Barnesville, OH | United States |
| Population | 3,402 | 3,569 | 329,725,481 |
| Female Population | 58.1% | 52.2% | 50.5% |
| Male Population | 41.9% | 47.8% | 49.5% |
| Median Age | 45.6 | 45 | 38.4 |
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| Population - 2010 | 3,606 | 4,194 | 309,327,143 |
| Population - 2000 | 3,675 | 4,225 | 285,036,114 |
| Population - 1990 | 3,497 | 4,326 | 251,960,433 |
| Pop. 2000 to Now | -10.1% | -6.5% | 15.6% |
| Pop. 1990 to Now | -5.5% | -8.7% | 30.8% |
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| Population Density | 756.8 | 1,836.9 | 93.4 |
| Land Area | 4.5 | 1.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Blackstone, VA | Barnesville, OH | United States |
| Age 0 to 4 | 4.2% | 5.4% | 5.9% |
| Age 5 to 9 | 3.1% | 3.8% | 6.1% |
| Age 10 to 14 | 8.3% | 9.3% | 6.6% |
| Age 15 to 17 | 6.7% | 4.7% | 3.9% |
| Age 18 to 20 | 3.6% | 4.1% | 4.0% |
| Age 21 to 24 | 5.6% | 2.2% | 5.2% |
| Age 25 to 34 | 8.1% | 10.4% | 13.8% |
| Age 35 to 44 | 8.5% | 10.1% | 12.9% |
| Age 45 to 54 | 13.2% | 17.5% | 12.6% |
| Age 55 to 59 | 6.6% | 4.8% | 6.7% |
| Age 60 to 64 | 12.3% | 6.5% | 6.3% |
| Age 65 to 74 | 7.4% | 11.7% | 9.6% |
| Age 75 to 84 | 4.5% | 6.8% | 4.5% |
| Age 85 and over | 8.0% | 2.7% | 1.9% |
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| Race | | | |
| | Blackstone, VA | Barnesville, OH | United States |
| White | 41.2% | 94.9% | 59.4% |
| Black | 47.2% | 0.0% | 12.2% |
| Asian | 0.9% | 2.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.6% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.8% | 2.4% | 3.2% |
| Hispanic | 10.0% | 0.0% | 18.4% |
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| Marriage & Family | | | |
| | Blackstone, VA | Barnesville, OH | United States |
| Married Population | 42.5% | 45.8% | 49.8% |
| Currently Married | 39.0% | 45.8% | 48.0% |
| Married but Separated | 3.5% | 0.0% | 1.8% |
| Single Population | 57.5% | 54.2% | 50.2% |
| Never Married | 27.8% | 31.2% | 33.8% |
| Divorced | 16.6% | 16.1% | 10.8% |
| Widowed | 13.1% | 6.8% | 5.6% |
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| Household Size | 2.45 | 2.56 | 2.60 |
| Households | 1,328 | 1,327 | 124,010,992 |
| Family Households | 793 | 832 | 80,755,759 |
| Married couple, w/children | 30.9% | 26.7% | 30.5% |
| Married couple, no children | 38.5% | 40.9% | 42.9% |
| Non Family Households | 535 | 495 | 43,255,233 |
| Single householder, w/children | 23.7% | 22.0% | 15.8% |
| Single householder, no children | 6.9% | 10.5% | 10.8% |