Parcel Return Service, DC

ZIP code 56966 is a special-purpose postal code associated with Washington, D.C., rather than a conventional residential area with a clearly defined neighborhood boundary. Public maps do not establish major visitor landmarks within the code itself. The White House, U.S. Capitol, National Mall, and Smithsonian museums are prominent landmarks in the wider city, but they should not be described as located in 56966 without a verified address-level match.