Barnwell County's estimated 2026 population is 20,794 with a growth rate of 0.68% 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 -8.15% since that time.
Data after 2023 is projected based on recent change
Overall: 40.4 years
Female: 41.8 years
Male: 37.6 years
There are 15,651 adults, (3,927 of whom are seniors) in Barnwell County.
Female: 10,616 (51.7%)
Male: 9,905 (48.3%)
The racial composition of Barnwell County includes 52.22% White, 42.8% Black or African American, and smaller percentages for Two or more races, other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 10,716 | 52.22% |
| Black or African American | 8,783 | 42.8% |
| Two or more races | 569 | 2.77% |
| Other race | 302 | 1.47% |
| Asian | 120 | 0.58% |
| Native American | 25 | 0.12% |
| Native Hawaiian or Pacific Islander | 6 | 0.03% |
Barnwell County's average per capita income is $42,189. Household income levels show a median of $46,626. The poverty rate stands at 25.01%.
Name | Median | Mean |
|---|---|---|
| Married Families | $91,740 | - |
| Families | $63,603 | $80,569 |
| Households | $46,626 | $66,517 |
| Non Families | $25,283 | $38,221 |
Average Income
Median Household Income
Poverty Rate