Parkton, MD

ZIP code 21120 is located in Maryland and belongs to Aberdeen Proving Ground. This military installation is home to the U.S. Army's oldest active proving ground, testing a variety of military weapons and equipment. The area also includes the Edgewood Area, where research and development activities are conducted. Important landmarks within this ZIP code include the Edgewood Chemical Biological Center and the U.S. Army Test and Evaluation Command headquarters.