Castle Rock is a city in Cowlitz County, Washington, United States. Located between the Willapa Hills and western base of Mount St. Helens, Castle Rock is at the heart of Washington timber country in the Pacific temperate rain forest. Castle Rock is part of the Longview, Washington Metropolitan Statistical Area; the population was 1,982 as of the 2010 census.
Castle Rock, the Gateway to Mount St. Helens, is 117 miles south of Seattle, Washington and 58 miles north of Portland, Oregon, 46°16′26″N 122°54′18″W (46.273991, −122.904916). Castle Rock is situated between the Cowlitz River and Interstate 5, one mile south of the confluence of the Cowlitz and the Toutle River. According to the United States Census Bureau, the city has a total area of 1.76 square miles (4.56 km²), of which, 1.59 square miles (4.12 km²) is land and 0.17 square miles (0.44 km²) is water. It is the northernmost city in Cowlitz County.
As of the census of 2010, there were 1,982 people, 784 households, and 519 families residing in the city. The population density was 1,246.5 inhabitants per square mile (481.3/km²). There were 863 housing units at an average density of 542.8 per square mile (209.6/km²). The racial makeup of the city was 91.4% White, 0.1% African American, 2.2% Native American, 0.2% Asian, 0.4% Pacific Islander, 1.7% from other races, and 4.0% from two or more races. Hispanic or Latino of any race were 4.9% of the population.
There were 784 households of which 32.7% had children under the age of 18 living with them, 43.5% were married couples living together, 16.3% had a female householder with no husband present, 6.4% had a male householder with no wife present, and 33.8% were non-families. 27.7% of all households were made up of individuals and 10.9% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.06.
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