Downers Grove, IL has a population of 49,555 and is the 828th largest city in the United States. The population density is 3,415 per sq mi which is 1436% higher than the Illinois average and 3670% higher than the national average. The median age in Downers Grove is 43 which is approximately 15% higher than the Illinois average of 37. In Downers Grove, 62% of the population over 15 years of age are married, 88% speak English and 2% speak Spanish. 71% of Downers Grove residents were born in Illinois, 18% were born out of state, 1% were born outside of the United States and 11% were foreign born.