Washington, DC

ZIP code 20389 encompasses the Pentagon, one of the world's largest office buildings and the headquarters of the United States Department of Defense. Located in Arlington, Virginia, this landmark structure houses multiple military commands and offices, including the Office of the Secretary of Defense and the Joint Chiefs of Staff. The area surrounding ZIP code 20389 also includes the Arlington National Cemetery, a national military cemetery that is a significant site for honoring fallen members of the armed forces.