There are 13 US Post Offices in Dorchester County serving a total of 31,313 residents equating to 2,409 residents per post office. It's estimated that approximately 49,979 packages are handled across the 13 county post offices annually. Dorchester County is a county located in the U.S. state of Maryland. As of the 2010 census, the population was 32,618. Its county seat is Cambridge. The county was formed in 1669 and named for the Earl of Dorset, a family friend of the Calverts (the founding family of the Maryland colony). Dorchester County comprises the Cambridge, MD Micropolitan Statistical Area, which is also included in the Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area. It is located on the Eastern Shore of Maryland. Dorchester County 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."