Dorchester County is a county located in the U.S. state of Maryland on its Eastern Shore. It became a county in 1669 and is the largest county on the Eastern Shore. It is bordered by the Choptank River to the north, Talbot County to the northwest, Caroline County to the northeast, Wicomico County to the southeast, Sussex County, Delaware, to the east, and the Chesapeake Bay to the west. Dorchester County uses the slogan, "The Heart of Chesapeake Country," due to its geographical location and the heart-like shape of the county on a map. In 2010, its population was 32,618. It was named for the Earl of Dorset, a family friend of the Calverts (the founding family of the Maryland colony). Its county seat is Cambridge.