Barnwell County's estimated 2025 population is 20,399 with a growth rate of -0.12% in the past year according to the most recent United States census data. Barnwell County is the 38th largest county in South Carolina. The 2010 population was 22,639 and has seen a growth of -9.89% since that time.
Data after 2023 is projected based on recent change
The racial composition of Barnwell County includes 52.19% White, 43.26% Black or African American, and smaller percentages for Two or more races, other race, Asian, Native American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 10,732 | 52.19% |
| Black or African American | 8,897 | 43.26% |
| Two or more races | 572 | 2.78% |
| Other race | 228 | 1.11% |
| Asian | 106 | 0.52% |
| Native American | 30 | 0.15% |
Married
Widowed
Divorced
Separated
Never Married
Barnwell County's average per capita income is $39,647. Household income levels show a median of $41,800. The poverty rate stands at 28.53%.
Name | Median | Mean |
|---|---|---|
| Married Families | $88,504 | - |
| Families | $56,726 | $74,610 |
| Households | $41,800 | $62,036 |
| Non Families | $23,446 | $38,260 |
Average Income
Median Household Income
Poverty Rate