Blyn is a census-designated place (CDP) in Clallam County, Washington, United States. As of the 2020 census, Blyn had a population of 108. It is located near the city of Sequim on the shores of Sequim Bay. The area includes the Jamestown S'Klallam Indian Reservation, established in 1874 by the Jamestown S'Klallam Tribe, who named their community Jamestown after their leader; Lord James Balch.