Parcel Return Service, DC

ZIP code 56984 is a special-use postal code associated with Washington, D.C., rather than a conventional neighborhood ZIP with defined public boundaries. As a result, landmarks cannot be reliably said to lie “within” its postal footprint. The surrounding capital city is home to major sites including the U.S. Capitol, the National Mall, the Smithsonian museums, and the Library of Congress; these describe Washington, not a verified 56984 boundary.