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.

The Colony of Rhode Island and Providence Plantations was one of the original Thirteen Colonies established on the east coast of America, bordering the Atlantic Ocean. It was founded by Roger Williams. It was an English colony from 1636 until 1707, and then a colony of Great Britain until the American Revolution in 1776, when it became the State of Rhode Island and Providence Plantations.