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San Juan Island Washington Last Updated: 10/17/2026 |
| San Juan Island is the second largest and most populous island in the San Juan Islands archipelago northwest of Washington. The island has a population of 8,632 in 2020. The Washington State Ferries Company serves Friday Harbor, the main residential center of San Juan Island, which is the county seat of San Juan County and the only officially established town on the islands. | |
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