Charleston County is located in the U.S. state of South Carolina along the Atlantic coast. As of the 2020 census, the population was 408,235, making it the third-most populous county in South Carolina
Berkeley County is a county in the U.S. state of South Carolina. As of the 2020 census, its population was 229,861. Its county seat is Moncks Corner, and the largest community is Goose Creek.