Centreville, IL has a population of 5,127 and is the 6,350th largest city in the United States. The population density is 1,226 per sq mi which is 451% higher than the Illinois average and 1253% higher than the national average. The median age in Centreville is 37 which is approximately 2% lower than the Illinois average of 37. In Centreville, 36% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 65% of Centreville residents were born in Illinois, 35% were born out of state, 0% were born outside of the United States and 0% were foreign born.