Whidbey Island (historical spellings Whidby, Whitbey, or Whitby) is the largest of the islands composing Island County, Washington. (The other large island is Camano Island, east of Whidbey.) Whidbey is about 30 miles (48 km) 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. Whidbey Island is home to 58,211 residents (according to the 2000 census). An estimated 29,000 of Whidbey Island residents live in rural locations.