Hall County is a county in the Northeast region of the U.S. state of Georgia. As of the 2020 census, the population was 203,136, up from 179,684 at the 2010 census. The county seat is Gainesville. The entirety of Hall County comprises the Gainesville, Georgia, Metropolitan Statistical Area, which is also part of the Atlanta-Athens-Clarke County-Sandy …Hall County is a county in the Northeast region of the U.S. state of Georgia. As of the 2020 census, the population was 203,136, up from 179,684 at the 2010 census. The county seat is Gainesville. The entirety of Hall County comprises the Gainesville, Georgia, Metropolitan Statistical Area, which is also part of the Atlanta-Athens-Clarke County-Sandy Springs, Combined Statistical Area.