Schiller Park, IL has a population of 11,813 and is the 3,459th largest city in the United States. The population density is 4,265 per sq mi which is 1819% higher than the Illinois average and 4608% higher than the national average. The median age in Schiller Park is 39 which is approximately 3% higher than the Illinois average of 37. In Schiller Park, 57% of the population over 15 years of age are married, 37% speak English and 25% speak Spanish. 53% of Schiller Park residents were born in Illinois, 4% were born out of state, 2% were born outside of the United States and 40% were foreign born.