Fox Island is an island and census-designated place in Pierce County, Washington, United States, in Puget Sound. It is located approximately five miles from Gig Harbor. The island was named Fox by Charles Wilkes during the United States Exploring Expedition, to honor J.L. Fox, an assistant surgeon on the expedition. The population was 3,633 at the 2010 census. Fox Island, WA is home to a variety of public places and non-profit organizations. Tanglewood Island is the most visible icon of the Fox Island area, with its non-operational lighthouse, the Fox Island Nature Center features trails and picnic areas traversing a wetland stream, the Fox Island Sand Spit with its naturally occurring gravel formation in Case Inlet, the Nichols Community Center and Fox Island playground, Boat Launch and Fishing Pier, located on the easternmost tip of the Island.