Cicero, IL has a population of 83,972 and is the 407th largest city in the United States. The population density is 14,317 per sq mi which is 6340% higher than the Illinois average and 15703% higher than the national average. The median age in Cicero is 29 which is approximately 23% lower than the Illinois average of 37. In Cicero, 46% of the population over 15 years of age are married, 17% speak English and 82% speak Spanish. 54% of Cicero residents were born in Illinois, 5% were born out of state, 1% were born outside of the United States and 40% were foreign born.