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
City
Population
29812Barnwell10,773
29853Williston6,205
29817Blackville4,392
29826Elko219

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