Centralia is a city in Lewis County, Washington, United States. The population was 16,336 at the 2010 census.
According to the United States Census Bureau, the city has a total area of 7.56 square miles (19.58 km²), of which, 7.42 square miles (19.22 km²) is land and 0.14 square miles (0.36 km²) is water.
As of the census of 2010, there were 16,336 people, 6,640 households, and 3,867 families residing in the city. The population density was 2,201.6 inhabitants per square mile (850.0/km²). There were 7,265 housing units at an average density of 979.1 per square mile (378.0/km²). The racial makeup of the city was 85.1% White, 0.6% African American, 1.4% Native American, 1.0% Asian, 0.3% Pacific Islander, 7.4% from other races, and 4.1% from two or more races. Hispanic or Latino of any race were 16.1% of the population.
There were 6,640 households of which 31.6% had children under the age of 18 living with them, 37.7% were married couples living together, 14.4% had a female householder with no husband present, 6.1% had a male householder with no wife present, and 41.8% were non-families. 33.8% of all households were made up of individuals and 15.8% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 3.06.
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