San Juan Island is the second-largest and most populous of the San Juan Islands in northwestern Washington, United States. It has a land area of 142.59 km² (55.053 sq mi) and a population of 6,822 as of the 2000 census.
Washington State Ferries serves Friday Harbor, which is San Juan Island's major population center, the San Juan County seat, and the only incorporated town in the islands.
Scheduled seaplane services operate regularly to Friday Harbor from Seattle Lake Union and Kenmore, WA.
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