There was a total of around $341 million of land and rural real estate for sale in Washington County recently on Land.com. The total of all Washington County farms, hunting land and other rural land and acreage for sale was 1,000 acres. Washington County ranks second in the Ocean State based on the total amount of acres of land for sale of all the counties in the Ocean State. Among cities in Washington County with farms and rural real estate for sale, South Kingstown featured the most land for sale. Washington County is the largest county in Rhode Island (562 square miles). It's located in the South Rhode Island region of Rhode Island.