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. It is a beachfront community on the south shore of the state with a population of 23,359 as of the 2020 census.

Washington County, known locally as South County, is a county located in the U.S. state of Rhode Island. As of the 2020 census, the population was 129,839. Rhode Island counties have no governmental functions other than as court administrative boundaries, which are part of the state government.