Haralson County is a county in the Northwest region of the U.S. state of Georgia. As of the 2020 census, the population was 29,919, up from 28,780 in 2010. The county seat is Buchanan. The county was created on January 26, 1856, and was named for Hugh A. Haralson, a former Georgia congressman. Haralson County is part of the Atlanta-Sandy Springs-Roswell, GA metropolitan statistical area.