Washington, DC

ZIP code 20407 is located in Washington, DC. This area is home to prominent landmarks such as the Smithsonian Institution Building, also known as the "Castle," which serves as the headquarters for the Smithsonian Institution, overseeing 19 museums and galleries. Additionally, the National Mall and the United States Capitol are nearby, making ZIP code 20407 a hub of history, culture, and government in the nation's capital.