Aberdeen Proving Ground, MD

ZIP code 21005 covers Aberdeen Proving Ground, a major U.S. Army facility in Harford County, Maryland. The area is home to various military operations and research facilities, including the U.S. Army Combat Capabilities Development Command Chemical Biological Center and the U.S. Army Test and Evaluation Command. Additionally, Aberdeen Proving Ground houses numerous historic buildings dating back to World War I and World War II, making it a significant location for military history.