Blythe is a city, mostly in Richmond County and partly in Burke County, in the U.S. state of Georgia. As of the 2020 census, the city had a popul…Blythe is a city, mostly in Richmond County and partly in Burke County, in the U.S. state of Georgia. As of the 2020 census, the city had a population of 744. It is part of the Augusta, Georgia metropolitan area.