Welcome to San Juan County ...Time Zone: San Juan County lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time. The community of Friday Harbor is the Seat for San Juan County. San Juan County was founded in 1873 and was created by taking area from Whatcom County. From the Census Estimates for 2019, <1> San Juan had a population of 17,582 people. This is an increase of 11.4% since the last Census (which gave a population of 15,783 people in 2010). At the time of the 2010 Census, San Juan represented 0.23% of the total population of Washington. Websites of Interest ...
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