Westerly is a town on the southwestern coastline of Washington County, Rhode Island, United States, first settled by English colonists in 1661, and incorporated as a municipality in 1669. The Town of Westerly is a beachfront community on the south shore of the state with a population of 23,359 as of the 2020 census. The western and northern borders of Westerly are defined by a natural border of the Pawcatuck River, with the bordering town of Hopkinton defined by the Pawcatuck River, while holding a straight border to the east with Charlestown.