There are 17 US Post Offices in Gwinnett County serving a total of 833,798 residents equating to 49,047 residents per post office. It's estimated that approximately 1,330,835 packages are handled across the 17 county post offices annually. Gwinnett County is a county in the north central portion of the U.S. state of Georgia. As of the 2010 census, the population was 859,304, making it the second-most populous county in Georgia. Its county seat is Lawrenceville. The county is named for Button Gwinnett, one of the signers of the Declaration of Independence. Gwinnett County is included in the Atlanta-Sandy Springs-Roswell, GA Metropolitan Statistical Area."