| Name | Barnwell County |
| State | South Carolina |
| FIPS Code | 45011 |
| County Seat | Barnwell |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2024) | 20,448 |
| Population Growth Rate(2020-2024) | -0.7% |
| Majority Ethnicity | White 52.76% |
| Public School Majority Ethnicity | African American 55% |
| Partisan Voting Index | Republican:+7 |
| Unemployment Rate (May 2026) | 6.6% |
| Sales Tax Rate (2025) | 8% |
| Area Code(s) | 803 / 839 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 52.76% |
| African American | 43.74% |
| Hispanic | 2.83% |
| Asian | 0.52% |
| Native American | 0.15% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 35.83% |
| African American | 55.43% |
| Hispanic | 3.66% |
| Asian | 1.07% |
| Native American | 0.09% |
| Hawaiin/Pacific Islander | 0.16% |