Chinook is a census-designated place (CDP) in Pacific County, Washington, United States. The population was 457 at the 2000 census and increased to 466 at the 2010 census.
Chinook was the site of the first court in Pacific County in 1853, as well as the county's first salmon cannery in 1870.
Chinook was once a wealthy town based on the salmon harvest. There was no road connection to Ilwaco until 1891, when the bridge was completed across the Chinook River. Later, the Ilwaco Railway and Navigation Company built a narrow gauge railroad from Megler to Ilwaco, passing down the main street of Chinook. The railroad was dismantled in 1931.
According to the United States Census Bureau, the CDP has a total area of 1.0 square miles (2.6 km2), all of it land. The town is located just north of the Columbia River.
As of the census of 2000, there were 457 people, 210 households, and 137 families residing in the CDP. The population density was 446.8 people per square mile (173.0/km2). There were 263 housing units at an average density of 257.1/sq mi (99.6/km2).