Lake Pocotopaug is an unincorporated village and census-designated place in the town of East Hampton in Middlesex County, Connecticut, United States. As of the 2020 census, it had a population of 4,901, up from 3,436 in 2010. It is named for the large local lake, which for years has been a popular resort area. The lake is surrounded by numerous homes. Most are year-round residences, although some summer cottages dot the shore.