There are 7 US Post Offices in Greenwood County serving a total of 96,228 residents equating to 13,747 residents per post office. It's estimated that approximately 153,591 packages are handled across the 7 county post offices annually. Greenwood County is a county located in the U.S. state of South Carolina. As of the 2010 census, its population was 69,661. Its county seat is Greenwood. Greenwood County is included in the Greenwood, SC Micropolitan Statistical Area, which is also included in the Greenville-Spartanburg-Anderson, SC Combined Statistical Area.