| Place Name | Barnwell |
| Place Type | City |
| ZIP Code(s) | 29812 |
| County | Barnwell County |
| Area Code(s) | 803 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 4,737 |
| Population Growth Rate (2010-19) | -2.06% |
| Majority Ethnicity | African American 57.76% |
| US Congressional District(s) | South Carolina 2nd |
| State House Districts | 91 |
| State Senate Districts | 40 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 41.46% |
| African American | 57.76% |
| Hispanic | 0.33% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0.44% |