Edgewood, MD – Harford County
Edgewood, Maryland is an unincorporated community located in the southern part of Harford County, MD. It is bordered to the south by Aberdeen Proving Ground, zip code 21010, sometimes called Gunpowder, MD. (Edgewood Area, formerly known as Edgewood Arsenal). Edgewood is bordered to the east by the Bush River, to the north by Abingdon, MD 21009 and to the west by Joppa, MD 21085 (also known as Joppatown, Joppatowne or Magnolia)
Edgewood and Aberdeen were primarily rural agricultural areas until the early 20th century. World War I brought an urgent need for chemical warfare research, testing and manufacturing, and a suitable location was immediately sought. With an act of congress on October 20, 1917, the U.S. Government took possession of the Gunpower Neck and Bush Neck peninsula areas now known as Aberdeen Proving Ground (APG).
Learn more at https://en.wikipedia.org/wiki/Edgewood,_Maryland