Wahkiakum County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 3,978, making it the second-least populous county in Washington. The county seat and only incorporated town is Cathlamet. The county was formed out of Cowlitz County on April 25, 1854 and is named for Chief Wahkiakum ("Tall Timber") of the Chinook.
The County operates the Wahkiakum County Ferry, which connects Cathlamet to Westport, Oregon, across the Columbia River.
According to the U.S. Census Bureau, the county has a total area of 287 square miles (740 km²), of which 263 square miles (680 km²) is land and 24 square miles (62 km²) (8.3%) is water. It is the smallest county of Washington by total area and the third-smallest by land area, ahead of San Juan County and Island County, which are mostly water by area.
As of the 2010 United States Census, there were 3,978 people, 1,737 households, and 1,187 families residing in the county. The population density was 15.1 inhabitants per square mile (5.8/km²). There were 2,067 housing units at an average density of 7.8 per square mile (3.0/km²). The racial makeup of the county was 94.0% white, 1.3% American Indian, 0.6% Asian, 0.3% black or African American, 0.2% Pacific islander, 0.7% from other races, and 3.1% from two or more races. Those of Hispanic or Latino origin made up 2.7% of the population. In terms of ancestry, 19.8% were Norwegian, 19.3% were German, 13.3% were English, 9.6% were American, 8.5% were Swedish, and 6.8% were Irish.
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