American Twin Mover in Rockville Rockville is a city that serves as the county seat of Montgomery County, MD, part of the Baltimore–Washington metropolitan area. Interestingly, relocating to Rockville is the preferred choice of people in Maryland. But, how do people find long-distance moving services? Fortunately, we are so honored to be in this beautiful city. It has been many years that American Twin Mover has been serving Rockville Maryland. American Twin Mover is the top moving company!