ZIP codes in Barnwell County
7 ZIPs touch Barnwell County, South Carolina. The blue dashed line is the county border; orange ZIPs reach into it.
7
ZIP codes
6
cross the county line
22,987
people in these ZIPs
46
counties in SC
Most people
Barnwell County ZIP list
More counties in South Carolina
- Abbeville County13
- Aiken County30
- Allendale County7
- Anderson County23
- Bamberg County9
- Beaufort County22
- Berkeley County19
- Calhoun County7
- Charleston County41
- Cherokee County10
- Chester County11
Questions people actually ask
How many ZIP codes are in Barnwell County, South Carolina?
7 ZIP codes reach into Barnwell County. 6 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Barnwell County has the most people?
29812 (Barnwell) has about 11,132 residents, the most of any ZIP touching Barnwell County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Barnwell County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Barnwell County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from