Washington, DC

ZIP code 20591 is a specialized postal area in southwest Washington, D.C., chiefly associated with the Federal Aviation Administration (FAA). Its principal landmark is the FAA’s headquarters at 800 Independence Avenue SW, a prominent federal office building near the National Mall. Nearby landmarks include the Smithsonian National Air and Space Museum, the U.S. Capitol, and the Hirshhorn Museum and Sculpture Garden; the ZIP code is not a typical residential district.