Parcel Return Service, DC

ZIP code 56981 is a special-use postal code associated with Washington, D.C., rather than a conventional residential area with clearly defined neighborhood boundaries. Public ZIP maps therefore do not reliably establish which landmarks fall within it. Major landmarks in the surrounding city include the White House, the U.S. Capitol, the National Mall, and the Smithsonian museums, though they cannot all be confirmed as being within ZIP code 56981.