of exit 61 of Interstate 64 and west of exit 109 of Interstate 57. Centralia is one of three Illinois cities with portions in four counties, the others being Barrington Hills and Aurora. Because of its unique location within multiple counties, portions of Centralia are associated with different Core Based Statistical Areas (CBSAs). The Centralia Micropolitan Statistical Area includes all of Marion County. The Clinton County portion of the city is considered part of the St. Louis, MO–IL Metropolitan Statistical Area, while the Jefferson County portion lies within the Mt. Vernon Micropolitan Statistical Area. The portion of Centralia in Washington County is not considered part of any metropolitan or micropolitan area. According to the 2021 census gazetteer files, Centralia has a total area of , of which (or 88.81%) is land and (or 11.19%) is water. Demographics As of the 2020 census there were 12,182 people, 5,458 households, and 2,776 families residing in the city. The population density was . There were 5,900 housing units at an average density of . The racial makeup of the city was 77.92% White, 11.01% African American, 0.24% Native American, 2.09% Asian, 0.01% Pacific Islander, 1.33% from other races, and 7.41% from two or more races. Hispanic or Latino of any race were 3.29% of the population. There were 5,458 households, out of which 44.89% had children under the age of 18 living with them, 35.36% were married couples living together, 12.59% had a female householder with no husband present, and 49.14% were non-families. 40.67% of all households were made up of individuals, and 19.59% had someone living alone who was 65 years of age or older. The average household size was 2.92 and the average family size was 2.20. The city's age distribution consisted of 24.1% under the age of 18, 7.5% from 18 to 24, 23.8% from 25 to 44, 22.8% from 45 to 64, and 21.9% who were 65 years of age or older. The median age was 40.8 years. For every 100 females, there were 92.4 males. For every 100 females age 18 and over, there were 89.5 males. The median income for a household in the city was $39,117, and the median income for a family was $60,754. Males had a median income of $38,632 versus $25,986 for females. The per capita income for the city was $25,141. About 15.7% of families and 23.1% of the population were below