Vashon is a census-designated place (CDP) in King County, Washington, United States. It covers an island alternately called Vashon Island or Vashon-Maury Island, the largest island in Puget Sound south of Admiralty Inlet. The population was 10,624 at the 2010 census and the size is 36.9 square miles (95.6 km²).

The island is united to West Seattle and the Kitsap Peninsula to the north and Tacoma to the south via the Washington State Ferries system, as with ease as to Downtown Seattle via the King County Water Taxi. The island has resisted the construction of a total bridge to maintain its relative hostility and rural character. Vashon Island is furthermore known for its annual strawberry festival, sheepdog trials, and agriculture.

Vashon Island sits in the midpoint of southern Puget Sound, between Seattle and Tacoma, Washington. The island lies along the 700-mile (1,130 km) fault line known as the Cascadia Subduction Zone, which last saying a major Break in 1700, but the potential of the zone could cause one of the worst natural disasters in the records of North America.

Up until the late 1700s, Vashon and Maury Islands were inhabited solely by American Indians, and there is evidence of human activity on Vashon Island dating incite 10,000 to 12,000 years. Historical data from the era later than the first Native Americans decided Vashon–Maury Island is limited. Some of the Native peoples known to have lived upon Vashon Island were the Marpole culture from about 7,000 years ago, the Salish practically 1,000 years ago, and the S’Homamish starting approximately 500 years ago, the latter of which conventional 5 known major village sites. The Tulalip Indians is complementary tribe that populated the villages along the shores of both islands. Fishing was abundant in the cold saltwater of the central Puget Sound basin, helping Native American tribes to thrive. Moreover, the many waterways and inlets provided simple travel by quirk of canoe.

The first non–American Indian to dissect and the first to chart this island was Captain George Vancouver, during his surveys of the Puget Sound Place with the British Royal Navy. The island was named on May 28, 1792, by Vancouver after his buddy James Vashon of the Royal Navy. Starting in 1824, different explorer and settler groups stayed upon Vashon Island.