Dorchester County is a county located in the U.S. state of South Carolina. As of the 2010 census, the population was 136,555. Its county seat is St. George.Dorchester County is included in the Charleston-North Charleston, SC Metropolitan Statistical Area.HistoryDorchester County is named for its first settlement area, which was established by Congregationalists in 1696. These settlers applied the name "Dorchester" after their last residence in Dorchester, Massachusetts.Dorchester was not established as a separate county until 1897. However, when it was separately established, it came from parts of the neighboring Colleton and Berkeley counties.GeographyAccording to the U.S. Census Bureau, the county has a total area of, of which is land and (0.4%) is water.Adjacent countiesBamberg County - westBerkeley County - eastCharleston County - southeastColleton County - southwestOrangeburg County - northwest
