Coosa County is a county located in the east central portion of the U.S. state of Alabama. As of the 2020 census the population was 10,387. Its county seat is Rockford. Its name derives from a town of the Creek tribe and the Coosa River, which forms one of the county borders. Coosa County is included in the Talladega-Sylacauga, AL Micropolitan Statistical Area, which is also included in the Birmingham-Hoover-Talladega, AL Combined Statistical Area.