High Quality Content by WIKIPEDIA articles! The town of Stonington is located in New London County, Connecticut, United States, in the state`s southeastern corner. It includes the borough of Stonington, the villages of Pawcatuck, Lords Point, and Wequetequock, and the eastern halves of the villages of Mystic and Old Mystic (the other halves being in the town of Groton). The population of the town was 18,545 at the 2010 census.