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 (38.584583, -90.103768).
According to the 2010 census, Centreville has a total area of 4.287 square miles (11.10 km2), of which 4.23 square miles (10.96 km2) (or 98.67%) is land and 0.057 square miles (0.15 km2) (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.