All Counties › South Carolina
Barnwell County, South Carolina
Barnwell County lies in South Carolina's coastal-plain interior south of Aiken, bordering the Savannah River, with the towns of Barnwell, Williston, and Blackville anchoring its rural, low-density landscape. Its western portion overlaps the federal Savannah River Site and it hosts a licensed low-level radioactive waste disposal facility near Snelling, land-use factors any broker or developer must weigh alongside the county's timber and row-crop agricultural base.
Open the live Barnwell County map →
Barnwell County at a glance
- 21,000Population (2025)
- BarnwellCounty seat
- 548 sq miLand area
- 38 / sq miDensity
- $47,000Median household income
- $105,000Median home value
What the live Barnwell County map shows
Free in your browser, nothing to download:
- City Boundaries: 7
- School Boundaries: 1
- Congressional Districts: 2
- Opportunity Zones: 3
- Soils: 101
- State House Districts: 2
- State Senate Districts: 2
- Zip Codes: 10
Cities and towns in Barnwell County
Barnwell, Blackville, Elko, Hilda, Kline, Snelling, Williston.
Neighboring counties
- Aiken County, SC · map
- Allendale County, SC · map
- Bamberg County, SC · map
- Burke County, GA · map
- Orangeburg County, SC · map