There are 3 US Post Offices in Gilmer County serving a total of 18,389 residents equating to 6,130 residents per post office. It's estimated that approximately 29,351 packages are handled across the 3 county post offices annually. Gilmer 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 28,292. The county seat is Ellijay. The county was created on December 3, 1832 and was named for George Rockingham Gilmer. Gilmer County is home of the Apple Festival, a yearly event held in mid-October."