Washington, DC

ZIP code 20221 is located in Washington, D.C. This area is home to landmarks such as the United States Capitol, the Library of Congress, and the Supreme Court. The iconic Capitol building serves as the legislative hub of the United States government, while the Library of Congress is the largest library in the world, housing millions of books, recordings, photographs, maps, and manuscripts. The Supreme Court is where the highest court in the country convenes to hear cases and make legal decisions.