There are 4 US Post Offices in Barrow County serving a total of 73,384 residents equating to 18,346 residents per post office. It's estimated that approximately 117,129 packages are handled across the 4 county post offices annually. Barrow County is a county located in the north central portion of the U.S. state of Georgia. As of the 2010 census, the population was 69,367. The county seat is Winder. Barrow County is included in the Atlanta-Sandy Springs-Roswell, GA Metropolitan Statistical Area."