Centralia is a city in Boone County in the U.S. state of Missouri. The population was 4,027 at the 2010 census, with an estimated population of 4,244 in 2018. A very small portion of the city lies in Audrain County. The Boone County portion of Centralia (which forms the majority of the city) is part of the Columbia Metropolitan Statistical Area, while a small part in Audrain County is part of the Mexico Micropolitan Statistical Area. Centralia is located at 39°12′35″N 92°8′11″W (39.209657, -92.136300). According to the United States Census Bureau, the city has a total area of 2.84 square miles (7.36 km2), all land.
As of the census of 2010, there were 4,027 people, 1,601 households, and 1,063 families living in the city. The population density was 1,418.0 inhabitants per square mile (547.5/km2). There were 1,755 housing units at an average density of 618.0 per square mile (238.6/km2). The racial makeup of the city was 96.5% White, 1.0% African American, 0.4% Native American, 0.2% Asian, 0.5% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 1.6% of the population. There were 1,601 households, of which 36.0% had children under the age of 18 living with them, 48.4% were married couples living together, 12.7% had a female householder with no husband present, 5.2% had a male householder with no wife present, and 33.6% were non-families.
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