| | South Charleston, WV | Marietta, OH | United States |
| Population | 13,595 | 13,559 | 329,725,481 |
| Female Population | 53.1% | 50.8% | 50.5% |
| Male Population | 46.9% | 49.2% | 49.5% |
| Median Age | 43.9 | 38.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 13,668 | 14,082 | 309,327,143 |
| Population - 2000 | 13,390 | 14,515 | 285,036,114 |
| Population - 1990 | 13,645 | 15,026 | 251,960,433 |
| Pop. 2000 to Now | -10.1% | -7.9% | 15.6% |
| Pop. 1990 to Now | -11.8% | -11.1% | 30.8% |
| space4 | | | |
| Population Density | 1,723.1 | 1,608.6 | 93.4 |
| Land Area | 7.9 | 8.4 | 3,531,905.4 |
| Water Area | 0.9 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | South Charleston, WV | Marietta, OH | United States |
| Age 0 to 4 | 3.8% | 6.2% | 5.9% |
| Age 5 to 9 | 4.8% | 4.1% | 6.1% |
| Age 10 to 14 | 6.3% | 6.2% | 6.6% |
| Age 15 to 17 | 4.9% | 2.7% | 3.9% |
| Age 18 to 20 | 2.5% | 5.6% | 4.0% |
| Age 21 to 24 | 5.1% | 7.8% | 5.2% |
| Age 25 to 34 | 10.2% | 13.7% | 13.8% |
| Age 35 to 44 | 14.5% | 10.0% | 12.9% |
| Age 45 to 54 | 13.0% | 9.6% | 12.6% |
| Age 55 to 59 | 7.2% | 5.8% | 6.7% |
| Age 60 to 64 | 6.8% | 7.2% | 6.3% |
| Age 65 to 74 | 11.8% | 10.6% | 9.6% |
| Age 75 to 84 | 5.3% | 6.9% | 4.5% |
| Age 85 and over | 3.9% | 3.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | South Charleston, WV | Marietta, OH | United States |
| White | 81.0% | 92.4% | 59.4% |
| Black | 7.0% | 2.4% | 12.2% |
| Asian | 2.3% | 1.2% | 5.6% |
| Native American | 0.4% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.3% | 0.4% |
| Two or More Races | 7.1% | 1.7% | 3.2% |
| Hispanic | 2.1% | 1.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | South Charleston, WV | Marietta, OH | United States |
| Married Population | 38.4% | 39.2% | 49.8% |
| Currently Married | 37.2% | 37.4% | 48.0% |
| Married but Separated | 1.1% | 1.8% | 1.8% |
| Single Population | 61.6% | 60.8% | 50.2% |
| Never Married | 32.3% | 35.8% | 33.8% |
| Divorced | 23.0% | 15.7% | 10.8% |
| Widowed | 6.3% | 9.3% | 5.6% |
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| Household Size | 2.25 | 2.14 | 2.60 |
| Households | 6,044 | 5,775 | 124,010,992 |
| Family Households | 3,544 | 3,143 | 80,755,759 |
| Married couple, w/children | 22.2% | 17.8% | 30.5% |
| Married couple, no children | 38.1% | 43.1% | 42.9% |
| Non Family Households | 2,500 | 2,632 | 43,255,233 |
| Single householder, w/children | 21.7% | 27.8% | 15.8% |
| Single householder, no children | 18.0% | 11.3% | 10.8% |