Island County

Location of Island County in Washington StateIsland County is located in Washington State.  The county is made up of two larger islands, Whidbey and Camano, along with several small islands that occupy the northern portion of Puget Sound.  Island County is bordered on the west by Jefferson County, the northwest by San Juan County, the northeast by Skagit County, the east by Snohomish County, and the south by Kitsap County.  As of the 2010 U.S. Census, Island County had a total land area of 208.45 square miles and a population of 78,506.  Oak Harbor, located on Whidbey Island, is its largest city with a population of 22,075.  Also of interest:

  • The watershed sub-basin:  Puget Sound.
  • Larger lakes in Island County:  Cranberry Lake, Crockett Lake, Deer Lake and Lone Lake.
  • Located on Whidbey Island, Deception Pass State Park consists of 4, 134 acres with 77,000 feet of saltwater shoreline, and 33,900 feet of freshwater shoreline on three lakes.  The park also offers old-growth forests, sand dunes, 174 varieties of bird and spectacular views from rugged cliffs that drop to the turbulent waters of Deception Pass.

U.S. Census Bureau QuickFacts for Island County, WA

Office of Financial Management (OFM) county data for Island County, WA


Friday Harbor Library, photo by Kathy Ballard

Friday Harbor Library at the University of Washington

The Friday Harbor Library supports the interdisciplinary science community of the Friday Harbor Laboratories, University of Washington's marine research station in the San Juan Islands of Washington.

Camano Island State Park coastline. Image courtesy of WDFW.

Lessons learned: Island Local integrating pilot process for selecting near term actions for the 2014 Action Agenda.

This report discusses lessons learned from the task of choosing near term actions (NTAs), activities and initiatives for achieving recovery targets for Puget Sound Vital Sign indicators. It focuses on efforts by Local Integrating Organizations in Island County, including Whidbey and Camano Islands. 

Photo courtesy University of Washington Center for Conservation Biology;

Potential effects of the interaction between marine mammals and tidal turbines – an engineering and biomechanical analysis

A paper presented at the European Wave and Tidal Energy Conference in Aalborg, Denmark describes the potential effects of a tidal turbine strike on an endangered Southern Resident Killer Whale in Puget Sound (SRKW). A tidal turbine is proposed for deployment in Admiralty Inlet in Island County. 


2010 Census Quick Facts for Island County, WA

Learn more about demographics in Island County, Washington.  The U.S. Census Bureau published the following quick facts.