Bremen is a city in Haralson and Carroll counties, Georgia, United States. As of the 2020 census, the city had a population of 7,185 up from 6,2…Bremen is a city in Haralson and Carroll counties, Georgia, United States. As of the 2020 census, the city had a population of 7,185 up from 6,227 in the 2010 census. Most of the city is in Haralson County, with a small portion in Carroll County.