Island County is a county located in the U.S. state of Washington. As of the 2020 census, its population was 86,857. Its county seat is Coupeville, while its largest city is Oak Harbor. The county's name reflects the fact that it is composed entirely of islands. It contains two large islands, Whidbey and Camano, and seven smaller islands. Island County was created out of Thurston County on December 22, 1852, by the legislature of Oregon Territory, and is the eighth-oldest county in Washington. It originally encompassed what are now Snohomish, Skagit, Whatcom, and San Juan Counties. Island County comprises the Oak Harbor, Washington Micropolitan Statistical Area, which is also included in the Seattle–Tacoma, WA Combined Statistical Area.

Founded: 1852
Seat: Coupeville
Largest city: Oak Harbor
Total: 517 sq mi (1,339.02 km²)
Land: 208 sq mi (538.72 km²)
Water: 309 sq mi (800.31 km²), 60
Density: 381/sq mi (/km²)
Time zone: Pacific: UTC-8-7
Website: [www.islandcountywa.gov]
Official Website: http://www.islandcounty.net
Wikidata description: county in the state of Washington, United States
Wikidata id: Q493243
Wikidata label: Island County
Wikidata aliases: Array
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