Calvert County /

Calvert County is a county located in the U.S. state of Maryland. It occupies the Calvert Peninsula which is bordered on the east by the Chesapeake Bay and on the west by the Patuxent River. Calvert County is part of the Southern Maryland region. Calvert County's residents are among the highest median household-income in the United States. As of 2010, the population was 88,737. Its county seat is the town of Prince Frederick, Maryland. The county's name is derived from the family name of the Barons of Baltimore, the proprietors of the English Colony of Maryland. Calvert County is one of the several Maryland counties that make up part of the Washington Metropolitan Area or the Baltimore-Washington Metropolitan Area. Calvert County is the home of the notable Calvert Cliffs Nuclear Power Plant at Lusby. A branch of the United States Naval Research Laboratory is located at Chesapeake Beach. The Cove Point LNG Terminal is located near Lusby, Maryland, on the western shore of the Chesapeake Bay. The Patuxent River Naval Air Station is located immediately to the south of Calvert County, in St. Mary's County. According to the County's 2009 Comprehensive Annual Financial Report, the top