Ryderwood is a census-designated place in Cowlitz County, Washington, west of the city of Vader. The population was 395 as of the 2010 census.Ryderwood is located at 46°22′30″N 123°2′39″W / 46.37500°N 123.04417°W / 46.37500; -123.04417.According to the United States Census Bureau, the CDP has a total area of 0.16 square miles, of which all of it is land and none of it is water.As of the census of 2010, there were 395 people, 221 households, and 134 families residing in the CDP. The population density was 2,453.4 people per square mile. There were 266 housing units at an average density of 1,652.2/sq mi. The racial makeup of the CDP was 97.5% White, 0.3% African American, 1.3% Native American, 0.0% Asian, 0.0% Pacific Islander, 0.3% from other races, and 0.8% from two or more races. Hispanic or Latino of any race were 0.8% of the population.There were 221 households out of which 5.2% had children under the age of 18 living with them, 57.9% were married couples living together, 2.