The city of Gainesville is the county seat of Hall County, Georgia, United States. As of the 2010 census, the city had a population of 33,804. By 2015 the population had risen to an estimated 38,712. Because of its large number of poultry processing plants, it is often called the "Poultry Capital of the World". Gainesville is the principal city of, and is included in, the Gainesville, Georgia Metropolitan Statistical Area, which is included in the Atlanta-Sandy Springs-Gainesville, Georgia Combined Statistical Area.