Parcel Return Service, DC

ZIP code 56963 is a special-purpose USPS code associated with Washington, D.C., not a conventional neighborhood with clearly defined boundaries. Public ZIP-code maps therefore do not reliably establish which landmarks fall within it. The National Mall, U.S. Capitol, White House, and Smithsonian museums are prominent landmarks in Washington, but they should not be described as located in 56963 without address-level confirmation.