There are 4 US Post Offices in Glynn County serving a total of 52,035 residents equating to 13,009 residents per post office. It's estimated that approximately 83,054 packages are handled across the 4 county post offices annually. Glynn County is a county located in the U.S. state of Georgia. As of the 2010 census, the population was 79,626. The county seat is Brunswick. Glynn County is part of the Brunswick, GA Metropolitan Statistical Area."