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San Juan County is a county located 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 city is Friday Harbor, located 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 themselves have no state highways, the ferry routes serving the islands are designated as part of the state highway system.
[edit] History
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. [edit] Timeline
[edit] Population History
Note: The San Juan Islands were in dispute with Great Britain until 1872, and were reported in the 1870 census as "the disputed islands." San Juan County was formed in 1873. [edit] Research Tips
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