Post Office in Barnwell County, SC

Find The Office You Need

• Barnwell Post Office

  221 Main Street, Barnwell, SC 29812

  803-259-3195
• Blackville Post Office

  476 Main Street, Blackville, SC 29817

  803-284-2752
• Elko Post Office

  10049 U.S. Highway 78, Elko, SC 29826

  803-266-3073
• Williston Post Office

  12926 Main Street, Williston, SC 29853

  803-266-2276