Jamestown is an unincorporated community and census-designated place (CDP) in Clallam County, Washington, United States. As of the 2020 census, Jamestown had a population of 412.
The community derives its name from Chief James, a Clallam Indian leader.
Jamestown is located in northeastern Clallam County, along the shore of the Strait of Juan de Fuca southeast of Dungeness. It is north of the city of Sequim.
According to the United States Census Bureau, the Jamestown CDP has a total area of , all of it land.