There are 2 US Post Offices in Rockdale County serving a total of 52,441 residents equating to 26,221 residents per post office. It's estimated that approximately 83,702 packages are handled across the 2 county post offices annually. Rockdale County is a county located in the U.S. state of Georgia. As of the 2010 census, the population was 85,215. The county seat is Conyers. Rockdale County is included in the Atlanta-Sandy Springs-Roswell, GA Metropolitan Statistical Area."