Wicomico County () is located in the southeastern part of the U.S. state of Maryland, on the Delmarva Peninsula. As of the 2010 census, the population was 98,733. The county seat is Salisbury. The county was named for the Wicomico River, which in turn derives from Algonquian language words wicko mekee, meaning "a place where houses are built," apparently referring to a Native American town on the banks. Wicomico County is included in the Salisbury, MD-DE Metropolitan Statistical Area. The newspaper of record is The Daily Times.

St. Mary's County, established in 1637, is a county located in the U.S. state of Maryland. As of the 2010 census, the population was 105,151. Its county seat is Leonardtown. The name is in honor of Mary, the mother of Jesus.St. Mary's County comprises the California-Lexington Park, Maryland Metropolitan Statistical Area, which also is included in the Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area. It is part of the Southern Maryland region. The county was the home to the first Maryland Colony, and the first capitol of the Colony of Maryland. Settled by English Catholics, it is considered to be the birthplace of religious freedom in North America, at a time when the British colonies were settled primarily by Protestants.The county is home to the Patuxent River Naval Air Station and St. Mary's College of Maryland. Traditionally, St. Mary's County has been known for its unique and historic culture of Chesapeake Bay tidewater farming, fishing, and crabbing communities. But with the advent of the military bases, growth of an extensive defense contractor presence, and the growth of St. Mary's College of Maryland, as well as increasing numbers of long-distance Washington, D.C. commuters, it has been undergoing a decades-long transformation which has seen the county's population double since 1970.

Naval Auxiliary Air Station Chincoteague was a U.S. Navy Auxiliary Air Station near Chincoteague Island, Virginia. In 1941, the United States entered World War II; early the following year, the Germans torpedoed two merchant ships off the Assateague coast. To guard the coast, the United States Army established two small posts on Virginia's Eastern Shore, one each at Accomac and Chincoteague. The Navy established the Chincoteague Naval Auxiliary Air Station in 1943, across from Chincoteague on the mainland. One young pilot being trained there, future president George Herbert Walker Bush, got in trouble for "buzzing" the house of a young woman he had met at a dance.In 1959, NASA acquired the former Naval Auxiliary Air Station Chincoteague, and engineering and administrative activities were moved to this location. In 1974, the Wallops Station was named Wallops Flight Center. The name was changed to Wallops Flight Facility in 1981, when it became part of Goddard Space Flight Center.

The Northern Neck is the northernmost of three peninsulas (traditionally called "necks" in Virginia) on the western shore of the Chesapeake Bay in the Commonwealth of Virginia (the other two are the Middle Peninsula and the Virginia Peninsula). This peninsula is bounded by the Potomac River on the north and the Rappahannock River on the south. It encompasses the following Virginia counties: Lancaster, Northumberland, Richmond, and Westmoreland, and had a population of 50,158 as of the 2020 census.The inclusion of King George County in the Northern Neck varies among commentators. Historically, the grant for the Northern Neck included all land between the Rappahannock and Potomac rivers, including far upstream of King George County—some 5 million acres. The boundaries of King George and Westmoreland counties have changed radically since their establishment, with significant exchanges of territory. Significant portions of the early King George County lay in what is now Westmoreland County.