Washington, DC

ZIP code 20548 is located in Washington D.C. and is home to numerous government buildings, including the headquarters of the U.S. Government Accountability Office (GAO). This ZIP code covers the Federal Triangle area, where iconic landmarks such as the White House, Capitol Hill, and the National Mall can be found. Additionally, several museums, such as the Smithsonian National Museum of American History, add to the cultural significance of this area.