| | St. Stephen, SC | Jamestown, SC | United States |
| Population | 1,454 | 91 | 329,725,481 |
| Female Population | 57.7% | 27.5% | 50.5% |
| Male Population | 42.3% | 72.5% | 49.5% |
| Median Age | 34.3 | 55.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,707 | 75 | 309,327,143 |
| Population - 2000 | 1,776 | 97 | 285,036,114 |
| Population - 1990 | 1,697 | 84 | 251,960,433 |
| Pop. 2000 to Now | 2.7% | -14.4% | 15.6% |
| Pop. 1990 to Now | 7.5% | -1.2% | 30.8% |
| space4 | | | |
| Population Density | 599.6 | 150.2 | 93.4 |
| Land Area | 2.4 | 0.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | St. Stephen, SC | Jamestown, SC | United States |
| Age 0 to 4 | 10.4% | 0.0% | 5.9% |
| Age 5 to 9 | 5.3% | 0.0% | 6.1% |
| Age 10 to 14 | 8.7% | 0.0% | 6.6% |
| Age 15 to 17 | 6.1% | 0.0% | 3.9% |
| Age 18 to 20 | 3.9% | 8.8% | 4.0% |
| Age 21 to 24 | 7.6% | 0.0% | 5.2% |
| Age 25 to 34 | 9.3% | 23.1% | 13.8% |
| Age 35 to 44 | 8.5% | 0.0% | 12.9% |
| Age 45 to 54 | 5.7% | 13.2% | 12.6% |
| Age 55 to 59 | 10.0% | 27.5% | 6.7% |
| Age 60 to 64 | 9.4% | 13.2% | 6.3% |
| Age 65 to 74 | 5.1% | 11.0% | 9.6% |
| Age 75 to 84 | 6.6% | 3.3% | 4.5% |
| Age 85 and over | 3.4% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | St. Stephen, SC | Jamestown, SC | United States |
| White | 48.7% | 75.8% | 59.4% |
| Black | 46.7% | 15.4% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.8% | 8.8% | 3.2% |
| Hispanic | 0.8% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | St. Stephen, SC | Jamestown, SC | United States |
| Married Population | 46.6% | 48.4% | 49.8% |
| Currently Married | 42.9% | 48.4% | 48.0% |
| Married but Separated | 3.7% | 0.0% | 1.8% |
| Single Population | 53.4% | 51.6% | 50.2% |
| Never Married | 37.1% | 40.7% | 33.8% |
| Divorced | 5.7% | 11.0% | 10.8% |
| Widowed | 10.5% | 0.0% | 5.6% |
| space5 | | | |
| Household Size | 2.64 | 1.54 | 2.60 |
| Households | 524 | 59 | 124,010,992 |
| Family Households | 366 | 29 | 80,755,759 |
| Married couple, w/children | 18.9% | 0.0% | 30.5% |
| Married couple, no children | 40.4% | 82.8% | 42.9% |
| Non Family Households | 158 | 30 | 43,255,233 |
| Single householder, w/children | 37.4% | 0.0% | 15.8% |
| Single householder, no children | 3.3% | 17.2% | 10.8% |