Washington, DC

ZIP code 20310 is located in Washington, DC. This area is home to numerous significant landmarks, including the Pentagon and the Pentagon Memorial, honoring the victims of the September 11, 2001, terrorist attacks. The Pentagon, one of the world's largest office buildings, serves as the headquarters of the United States Department of Defense. The ZIP code also encompasses Arlington National Cemetery, a revered military cemetery and final resting place for many American heroes.