Aurora, IL has a population of 200,907 and is the 114th largest city in the United States. The population density is 4,477 per sq mi which is 1914% higher than the Illinois average and 4841% higher than the national average. The median age in Aurora is 32 which is approximately 14% lower than the Illinois average of 37. In Aurora, 54% of the population over 15 years of age are married, 55% speak English and 37% speak Spanish. 58% of Aurora residents were born in Illinois, 15% were born out of state, 1% were born outside of the United States and 25% were foreign born.