Centreville was 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 was a city in St. Clair County, Illinois, United States. The population was 5,309 in 2010, down from 5,951 at the 2000 census. Historically a predominantly Black and working-class community, Centreville has faced persistent environmental challenges stemming from economic disinvestment, redlining, and neglect by local and state governments. On May 6, 2021, the city ceased to exist, being incorporated along with Alorton and Cahokia into the new city of Cahokia Heights. Before the merger, the city struggled with some of the highest poverty rates in Illinois, compounded by public health threats posed by chronic flooding and raw sewage overflows. The residents and advocates identify these as issues of environmental injustice rooted in racial and economic disparities.