Creve Coeur, IL has a population of 5,653 and is the 5,979th largest city in the United States. The population density is 1,314 per sq mi which is 491% higher than the Illinois average and 1350% higher than the national average. The median age in Creve Coeur is 41 which is approximately 10% higher than the Illinois average of 37. In Creve Coeur, 51% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 78% of Creve Coeur residents were born in Illinois, 20% were born out of state, 2% were born outside of the United States and 0% were foreign born.