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Edgefield Post Office
325 Bacon St
Edgefield, South Carolina 29824
Johnston Post Office
519 Calhoun St
Johnston, South Carolina 29832
Trenton Post Office
113 Watson St
Trenton, South Carolina 29847
Edgefield County
There are 3 US Post Offices in Edgefield County serving a total of 19,350 residents equating to 6,450 residents per post office. It's estimated that approximately 30,885 packages are handled across the 3 county post offices annually. Edgefield County is a county located on the western border of the U.S. state of South Carolina. As of the 2010 census, its population was 26,985. Its county seat is Edgefield. Edgefield County has as part of its western border the Savannah River; across the river is Augusta, Georgia. Edgefield is part of the Augusta-Richmond County, GA-SC Metropolitan Statistical Area."