1. L 3 Communication 7361 Calhoun Pl Ste 150, Derwood, MD 20855 Coordinate: 39.10859,-77.15141 Phone: (301) 340-1547
2. Dish Network 17503 Redland Rd, Derwood, MD 20855 Coordinate: 39.14378,-77.14444 Phone: (240) 327-0490