Us Army Department Route 550 Bldg 716 Fort Ritchie, MD 21719 Phone : (301) 733-7100 Nearest cities for Fort Ritchie, MD Cavetown, MD(7.8)   Frederick, MD(19.9)   Philadelphia, PA(162.8)   Rouzerville, PA(2.7)   Smithsburg, MD(6.3)   Thurmont, MD(8.1)   Washington, DC(64.0)