There are 3 US Post Offices in Upson County serving a total of 25,499 residents equating to 8,500 residents per post office. It's estimated that approximately 40,699 packages are handled across the 3 county post offices annually. Upson County is a county located in the west central portion of the U.S. state of Georgia. As of the 2010 census, the population was 27,153. The county seat is Thomaston. The county was created on December 15, 1824. Upson County comprises the Thomaston, GA Micropolitan Statistical Area, which is also included in the Atlanta-Athens-Clarke County-Sandy Springs, GA Combined Statistical Area."