There are 6 US Post Offices in Jefferson County serving a total of 16,957 residents equating to 2,826 residents per post office. It's estimated that approximately 27,065 packages are handled across the 6 county post offices annually. Jefferson County is a county located in the U.S. state of Georgia. As of the 2010 census, the population was 16,930. The county seat is Louisville. The county was created on February 20, 1796 and named for Thomas Jefferson, the third president of the United States."