San Juan County is a county in the Salish Sea in the far northwestern corner of the U.S. state of Washington. As of the 2020 census, its population was 17,788. The county seat and only incorporated town is Friday Harbor, on San Juan Island. The county was formed on October 31, 1873, from Whatcom County and is named for the San Juan Islands, which are in turn named for Juan Vicente de Güemes, 2nd Count of Revillagigedo, the Viceroy of New Spain.
Although the islands have no state highways, the ferry routes serving them are designated as part of the state highway system.
House flag of the Straits Steamship Company, a shipping firm that operated steamships on Puget Sound and the Strait of Juan de Fuca.
The San Juan Islands were the subject of a territorial dispute between Great Britain and the United States from 1846 to 1872, leading to the Pig War in 1859. The bloodless conflict ended through arbitration led by Kaiser Wilhelm I, which awarded the islands to the United States. San Juan County was home to Henry Cayou, one of the first elected officials of Native descent in Washington.
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