Blyn is a census-designated place (CDP) in Clallam County, Washington, United States. The population was 101 at the 2010 census, down from 162 at the 2000 census. 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 the community Jamestown.