East St. Louis, IL has a population of 26,731 and is the 1,614th largest city in the United States. The population density is 1,921 per sq mi which is 764% higher than the Illinois average and 2021% higher than the national average. The median age in East St. Louis is 34 which is approximately 9% lower than the Illinois average of 37. In East St. Louis, 29% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 65% of East St. Louis residents were born in Illinois, 35% were born out of state, 0% were born outside of the United States and 1% were foreign born.