Hanover, Maryland is an unincorporated community in the Baltimore/Annapolis area in northwestern Anne Arundel County, Maryland and eastern Howard County, Maryland in the United States, located south of Baltimore on the Howard County line.It is located approximately at the intersection of Maryland State Highway 100 and the Baltimore-Washington Parkway. It is part of the Baltimore-Washington Metropolitan Area and is located just southwest of the Baltimore-Washington International Thurgood Marshall Airport. It is bordered by Severn to the south, Linthicum to the east, Baltimore to the northeast, Ft. Meade to the west, and Columbia to the north.