Marine Barracks, Washington, D.C. is located at the corner of 8th and I streets, Southeast in Washington, D.C. Established in 1801, it is a National Historic Landmark, the oldest post in the United States Marine Corps, the official residence of the Commandant of the Marine Corps since 1806, and the main ceremonial grounds of the Corps. It is home to the U.S. Marine Drum and Bugle Corps and the U.S. Marine Band. Barracks Marines conduct ceremonial missions in and around the National Capital Region as well as abroad. They also provide security at designated locations around Washington, D.C. as necessary, and Barracks officers are part of the White House Social Aide Program.

Southeast is the southeastern quadrant of Washington, D.C., the capital of the United States, and is located south of East Capitol Street and east of South Capitol Street. It includes the Capitol Hill and Anacostia neighborhoods, the Navy Yard, the Joint Base Anacostia-Bolling (JBAB), the U.S. Marine Barracks, the Anacostia River waterfront, Eastern Market, the remains of several Civil War-era forts, historic St. Elizabeths Hospital, RFK Stadium, Nationals Park, and the Congressional Cemetery. It also contains a landmark known as "The Big Chair," located on Martin Luther King Jr. Avenue. The quadrant is split by the Anacostia River, with the portion that is west of the river sometimes referred to as "Near Southeast". Geographically, it is the second-smallest quadrant of the city.