Of 39 counties in the Evergreen State, San Juan County is 36th in terms of its size (620 square miles). San Juan County is in Puget Sound Washington. The total value of approximately 1,000 acres of lakefront property recently listed for sale in San Juan County, Washington, was approximately $2 million. Browse all waterfront property for sale in San Juan County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in San Juan County is residential property.