Terryville is a census-designated place (CDP) that can be found in Litchfield County, Connecticut, United States, and is the largest village within the town of Plymouth. In the 2010 census, Terryville was recorded as having a population of 5,387. The village is named for Eli Terry Jr., the son of the well-known clockmaker Eli Terry Sr. In addition to that, Terryville is also home to the Lock Museum of America. There is a water wheel located in downtown Terryville that is dedicated to the son of Eli Terry Sr.