Brinnon is a census-designated place (CDP) in Jefferson County, Washington, United States. The population was 797 at the 2010 census. The community is named for Ewell P. Brinnon, who in 1860 took a donation land claim at the mouth of the Duckabush River. It’s known landmarks tally Dosewallips State Park and Black Point Marina. Camp Parsons, founded in 1919 and the oldest Boy Scout camp west of the Mississippi River, sits just uncovered the north stop of the CDP.

Brinnon is located at 47°39′56″N 122°55′30″W / 47.66556°N 122.92500°W / 47.66556; -122.92500 (47.665652, -122.924952), approximately 61 miles (98 km) north of Olympia, on the Olympic Peninsula’s east side. It sits on the west side of Hood Canal on the eastern edge of the Olympic National Forest. U.S. Route 101 runs the length of the community, leading south to Olympia and north 59 miles (95 km) to Port Angeles.

According to the United States Census Bureau, the CDP has a total Place of 9.8 square miles (25.5 km²), of which 9.6 square miles (24.9 km²) are house and 0.3 square miles (0.7 km²), or 2.57%, are water. The CDP extends from Wawa Point in the north, just south of Jackson Cove, to the Mason County lineage in the south at Triton Cove, and includes the unincorporated communities (from north to south) of Seal Rock, Brinnon, and Duckabush. The Dosewallips River crosses the north-central allowance of the CDP and enters Hood Canal at Brinnon Flats just north of the unity of Brinnon, while the Duckabush River crosses the south-central allocation of the CDP, entering Hood Canal at Duckabush village, just south of Black Point.

Brinnon experiences an oceanic climate (Köppen climate classification Cfb) and is around categorised as part of the Csb climate category, receiving slightly beyond 30 mm (1.2 in), the threshold for Cfb inclusion.

As of the census of 2000, there were 803 people, 413 households, and 258 families residing in the CDP. The population density was 81.3 people per square mile (31.4/km²). There were 912 housing units at an average density of 92.4/sq mi (35.7/km²). The racial makeup of the CDP was 92.65% White, 0.25% African American, 1.49% Native American, 0.62% Asian, 0.25% Pacific Islander, 1.00% from other races, and 3.74% from two or more races. Hispanic or Latino of any race were 1.99% of the population.