How many people live in Barnwell County, SC?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 20,500 people living in Barnwell County, SC. That makes Barnwell County the 38th-most populous county in South Carolina. It is home to 0.37% of people living in the state.
20.5K
population of Barnwell County, SC (2024)
0.37%
County share of the South Carolina population (2024)
About 20,500 people lived in Barnwell County, SC in 2024.
Population estimates, 2000–2024
What are Barnwell County, SC’s age demographics?
About 4,200 Barnwell County residents are aged 65 and older in 2024. That represents 20.6% of its population. For comparison, the age group represents 19.8% of South Carolina’s population and 18% in the US overall.
Another 4,800 Barnwell County residents, or 23.5% of the population, were children under 18. For comparison, the age group represents 21.2% of South Carolina’s population and 21.6% in the US overall.
A lower share of Barnwell County, SC's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Barnwell County, SC’s racial and ethnic demographics?
Non-Hispanic Black or African American residents make up 42.2% of the Barnwell County, SC population, higher than the national share of 12.6%.
In contrast, Barnwell County’s Hispanic population accounts for 3.1%, below the 20% nationwide, and the non-Hispanic white population makes up 51.3% of the county, compared with 57.5% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Barnwell County, SC has a higher share of a non-Hispanic Black or African American population than South Carolina as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Barnwell County, SC is Barnwell with about 4,600 residents in 2024.
Cities and towns in Barnwell County, SC ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Barnwell | 4,589 |
| 2. | Williston | 2,879 |
| 3. | Blackville | 1,906 |
| 4. | Hilda | 421 |
| 5. | Snelling | 253 |
| 6. | Kline | 142 |
| 7. | Elko | 140 |
| 8. | Balance of Barnwell County | 10,165 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
