San Juan County is in Puget Sound Washington. Of the 39 counties in the Evergreen State, San Juan County is 36th in terms of its size (620 square miles). A recent survey of Land Network data includes about 1,000 acres of residential land and property for sale in Washington's San Juan County, which is valued at a combined $46 million. The average price of residential acreage for sale in San Juan County was $3 million. Browse all residential land and rural property for sale in Washington to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.