Brinnon is a census-designated place (CDP) in Jefferson County, Washington, United States. The population was 907 at the 2020 census. The community is named for Ewell P. Brinnon, who in the late 1850s took a donation land claim at the mouth of the Duckabush River. Its known landmarks include Dosewallips State Park, Triton Cove State Park, Murhutt Falls, and Black Point Marina. Brinnon is also adjacent to Camp Parsons, the oldest Boy Scout camp west of the Mississippi River.