Whidbey Island (historical spellings Whidby, Whitbey, or Whitby) is the largest of the islands composing Island County, Washington, in the United States, and the largest island in Washington State. (The other large island is Camano Island, east of Whidbey.) Whidbey is about north of Seattle, and lies between the Olympic Peninsula and the I-5 corridor of western Washington. The island forms the northern boundary of Puget Sound. It is home to Naval Air Station Whidbey Island. The state parks and natural forests are home to numerous old growth trees. According to the 2000 census, Whidbey Island was home to 67,000 residents with an estimated 29,000 of those living in rural locations. This increased slightly to 69,480 residents as of the 2010 census. Whidbey Island is approximately from north to south, and wide, with a total land area of , making it the 40th largest island in the United States. It is ranked as the fourth longest and fourth largest island in the contiguous United States, behind Long Island, New York; Padre Island, Texas (the world's longest barrier island); and Isle Royale, Michigan. In the state of Washington, it is the largest island, followed by Orcas Island. History Whidbey Island was inhabited by members of the Lower Skagit, Swinomish, Suquamish, Snohomish and other Native American tribes. The Salishan name for the island was Tscha-kole-chy. These were peaceful groups who lived off the sea and land, with fishing, harvesting nuts, berries and roots, which they preserved over the winter. The first known European sighting of Whidbey Island was during the 1790 Spanish expedition of Manuel Quimper and Gonzalo López de Haro on the Princesa Real. Captain George Vancouver fully explored the island in 1792. In May of that year, Royal Navy officers and members of Vancouver's expedition, Joseph Whidbey (master of HMS Discovery) and Peter Puget (a lieutenant on the ship), began to map and explore the areas of what would later be named Puget Sound. After Whidbey circumnavigated the island in June 1792, Vancouver named the island in his honor. By that time, Vancouver had claimed the area for Britain. On 4 June 1792, the King’s Birthday, near Possession Point at the southern end of Whidbey Island, Vancouver took formal possession of all the coast and hinterland contiguous to the Strait of Juan de Fuca, including Puget Sound, under the name of New Georgia. The first known overnight stay by a