South Kingstown is a town in, and the county seat of, Washington County, Rhode Island, United States. The population was 31,931 at the 2020 census. South Kingstown is the second largest town in Rhode Island by total geographic area, behind New Shoreham, and the third largest town in Rhode Island by geographic land area, behind Exeter and Coventry.

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.