Washington D.C. is located in what part of the United States?

Washington D.C. is indeed located in the Eastern part of the United States. Geographically, it is situated on the east bank of the Potomac River, bordering the states of Maryland and Virginia. As the nation's capital, it serves as a focal point for federal government activities and has historical significance linked to its Eastern location. The choice aligns with the broader regional classification, confirming its identity as part of the Eastern United States. Factors such as its founding in relation to other cities and its role as a center of politics further support this classification, making it distinctly Eastern in terms of geography and cultural influence.