| | Holly Hill, SC | North Vernon, IN | United States |
| Population | 1,346 | 6,836 | 329,725,481 |
| Female Population | 50.2% | 46.8% | 50.5% |
| Male Population | 49.9% | 53.3% | 49.5% |
| Median Age | 32.7 | 37.3 | 38.4 |
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| Population - 2010 | 1,276 | 6,955 | 309,327,143 |
| Population - 2000 | 1,281 | 6,515 | 285,036,114 |
| Population - 1990 | 1,478 | 5,311 | 251,960,433 |
| Pop. 2000 to Now | -9.3% | 1.7% | 15.6% |
| Pop. 1990 to Now | -21.4% | 24.8% | 30.8% |
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| Population Density | 1,026.7 | 873.8 | 93.4 |
| Land Area | 1.3 | 7.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Holly Hill, SC | North Vernon, IN | United States |
| Age 0 to 4 | 3.6% | 7.2% | 5.9% |
| Age 5 to 9 | 14.0% | 6.6% | 6.1% |
| Age 10 to 14 | 7.3% | 5.0% | 6.6% |
| Age 15 to 17 | 4.0% | 4.5% | 3.9% |
| Age 18 to 20 | 10.6% | 2.8% | 4.0% |
| Age 21 to 24 | 1.8% | 5.8% | 5.2% |
| Age 25 to 34 | 11.2% | 16.3% | 13.8% |
| Age 35 to 44 | 9.0% | 9.3% | 12.9% |
| Age 45 to 54 | 7.0% | 17.9% | 12.6% |
| Age 55 to 59 | 4.1% | 4.8% | 6.7% |
| Age 60 to 64 | 8.5% | 3.9% | 6.3% |
| Age 65 to 74 | 10.2% | 8.3% | 9.6% |
| Age 75 to 84 | 7.9% | 5.0% | 4.5% |
| Age 85 and over | 0.9% | 2.6% | 1.9% |
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| Race | | | |
| | Holly Hill, SC | North Vernon, IN | United States |
| White | 45.5% | 88.2% | 59.4% |
| Black | 51.0% | 2.8% | 12.2% |
| Asian | 0.4% | 0.8% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.9% | 1.6% | 3.2% |
| Hispanic | 1.0% | 6.6% | 18.4% |
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| Marriage & Family | | | |
| | Holly Hill, SC | North Vernon, IN | United States |
| Married Population | 44.8% | 39.2% | 49.8% |
| Currently Married | 44.2% | 37.8% | 48.0% |
| Married but Separated | 0.6% | 1.4% | 1.8% |
| Single Population | 55.2% | 60.8% | 50.2% |
| Never Married | 41.2% | 32.1% | 33.8% |
| Divorced | 7.4% | 20.5% | 10.8% |
| Widowed | 6.5% | 8.2% | 5.6% |
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| Household Size | 2.99 | 2.47 | 2.60 |
| Households | 446 | 2,635 | 124,010,992 |
| Family Households | 323 | 1,721 | 80,755,759 |
| Married couple, w/children | 23.8% | 14.1% | 30.5% |
| Married couple, no children | 44.0% | 41.1% | 42.9% |
| Non Family Households | 123 | 914 | 43,255,233 |
| Single householder, w/children | 26.0% | 34.9% | 15.8% |
| Single householder, no children | 6.2% | 9.9% | 10.8% |