Cathlamet is located in Wahkiakum county Washington with a geographic area of 0.5 square miles. The total population in Cathlamet is 605 with 44.6% male and 55.4% female. Children under age 5 represent 7.9% of the population, under age 18 equal 16.0% of the population and over age 65 is 33.6% of the population. The median household income is $43,636, per capita income is $25,777. There are a total of 274 housing units with 55.8% owner occupied. Education includes 19.7% of residents that are high school graduates and 24.8% with a bachelor's degree or higher. The average temperature in Cathlamet in the summer is 60 degrees, and in the winter 42 degrees.