District of Columbia

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 * Contains:
 * Washington: now covers the whole district, which is more commonly referred to as Washington, D.C.
 * Georgetown: formerly a separate city, now a neighborhood
 * The Potomac River is technically within the District's borders; the southwest border is the river's far side
 * Next to: Virginia, Maryland

Directory

 * Washington Metropolitan Area Transit Authority (WMATA)
 * Building the Washington Metro: An Online Exhibit