Brinnon is a census-designated place in Jefferson County, Washington, United States. The population was 803 at the 2000 census. The community is named for Elwell P. Brinnon, who, in 1860, took a donation land claim at the river's mouth. Brinnon is the home of Camp Parsons, the oldest Boy Scout camp west of the Mississippi River. It was visited by Lord Baden-Powell in 1926.Approximately 61 miles north of Olympia, Brinnon is located on the Olympic Peninsula's east side, along Hood Canal on the eastern edge of the Olympic National Forest.