There are 1 US Post Offices in Putnam County serving a total of 20,039 residents equating to 20,039 residents per post office. It's estimated that approximately 31,984 packages are handled across the 1 county post offices annually. Putnam County is a county located in the Piedmont of the U.S. state of Georgia. As of the 2010 census, the population was 21,218. The county seat is Eatonton. Since the early 21st century, the county has had a housing boom. It has proximity to Lake Oconee, a recreation site, as well as to major employment centers such as Atlanta, Athens, and Macon."