There are 4 zip codes in Barnwell County, South Carolina. The most populated is 29812, located in Barnwell. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
2981210,773Barnwell
298536,205Williston
298174,392Blackville
29826219Elko

Zip Codes in Barnwell County, South Carolina by Population (2024)