There are 1 US Post Offices in Hancock County serving a total of 9,656 residents equating to 9,656 residents per post office. It's estimated that approximately 15,412 packages are handled across the 1 county post offices annually. Hancock County is a county located in the U.S. state of Georgia. As of the 2010 census, the population was 9,429. The county seat is Sparta. The county was created on December 17, 1793 and named for John Hancock. Hancock County is included in the Milledgeville, GA Micropolitan Statistical Area.