Centreville is a city in St. Clair County, Illinois, United States. The population was 5,309 in 2010, down from 5,951 at the 2000 census.
Centreville is located at 38°35′4″N 90°6′14″W / 38.58444°N 90.10389°W / 38.58444; -90.10389 (38.584583, -90.103768).
According to the 2010 census, Centreville has a total area of 4.287 square miles (11.10 km), of which 4.23 square miles (10.96 km) (or 98.67%) is land and 0.057 square miles (0.15 km) (or 1.33%) is water.
As of the census of 2000, there were 5,951 people, 2,125 households, and 1,476 families residing in the city. The population density was 1,373.3 people per square mile (530.6/km²). There were 2,363 housing units at an average density of 545.3 per square mile (210.7/km²). The racial makeup of the city was 95.46% African American, 3.38% White, 0.13% Native American, 0.02% Pacific Islander, 0.13% from other races, and 0.87% from two or more races. Hispanic or Latino of any race were 0.57% of the population.
There were 2,125 households out of which 34.8% had children under the age of 18 living with them, 27.5% were married couples living together, 35.2% had a female householder with no husband present, and 30.5% were non-families. 26.8% of all households were made up of individuals and 11.8% had someone living alone who was 65 years of age or older. The average household size was 2.80 and the average family size was 3.38.
In the city, the population was spread out with 33.5% under the age of 18, 9.2% from 18 to 24, 23.9% from 25 to 44, 20.1% from 45 to 64, and 13.2% who were 65 years of age or older. The median age was 31 years. For every 100 females, there were 85.3 males. For every 100 females age 18 and over, there were 77.2 males.
The median income for a household in the city was $23,500, and the median income for a family was $27,310. Males had a median income of $32,024 versus $23,528 for females. The per capita income for the city was $11,150. About 28.7% of families and 34.4% of the population were below the poverty line, including 48.4% of those under age 18 and 14.6% of those age 65 or over.