Gunpowder zip code
Zip code in Gunpowder, MD
The location Gunpowder belongs to Harford County, state of Maryland. Gunpowder has been assigned with the zip code 21010.
Gunpowder is the official name of the location so if you want to use the US Postal Service you must use that name. You can also use any of the following names: Aber Prov Grd, Aberdeen Proving Ground.