GS Proctor And Associates Inc. Share: GS Proctor And Associates Inc. Visit Website 14405 Old Mill Road, Suite 201 Upper Marlboro, MD 20772 (301) 952-8885 www.gsproctor.com Rep Info Map Whom to Contact Steve Proctor 14405 Old Mill Road, Suite 201 Upper Marlboro, MD 20772 What's Nearby? Distance: 5 10 15 20 25 50 mi.