Cathlamet is a town located along the Ocean Beach Highway in Wahkiakum County, Washington, United States, where it is the county seat. The population was 532 at the 2010 census, though it has an additional rural population outside of the town limits.
Cathlamet is located at 46°12′14″N 123°23′2″W (46.203767, -123.383838).
According to the United States Census Bureau, the town has a total area of 0.50 square miles (1.29 km²), of which, 0.49 square miles (1.27 km²) is land and 0.01 square miles (0.03 km²) is water.
Cathlamet is connected across the Columbia River to Westport, Oregon via SR 409 and the county-operated Wahkiakum County Ferry.
As of the census of 2010, there were 532 people, 258 households, and 136 families residing in the town. The population density was 1,085.7 inhabitants per square mile (419.2/km²). There were 296 housing units at an average density of 604.1 per square mile (233.2/km²). The racial makeup of the town was 94.7% White, 0.2% African American, 0.9% Native American, 1.1% Asian, 0.8% from other races, and 2.3% from two or more races. Hispanic or Latino of any race were 3.4% of the population.
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