There are 1 US Post Offices in Miller County serving a total of 6,166 residents equating to 6,166 residents per post office. It's estimated that approximately 9,842 packages are handled across the 1 county post offices annually. Miller County is a county located in the U.S. state of Georgia. As of the 2010 census, the population was 6,125. The county seat is Colquitt. The county was created on February 26, 1856 and named after Andrew Jackson Miller (1806 \u2013 56), president of the Medical College of Georgia."