The Washington-Baltimore-Arlington area is a major metropolitan region in the United States, encompassing parts of Washington, D.C., Baltimore, Maryland, and Arlington, Virginia. This region is known for its rich history, diverse culture, and significant political influence, as it houses the federal government and numerous national monuments. The area is characterized by a mix of urban and suburban environments, with a population exceeding 9 million people. It features a robust economy, driven by sectors such as government, education, and technology. Public transportation, including the Washington Metro, connects the cities, making commuting accessible for residents and visitors alike.