Milan, IL has a population of 5,097 and is the 6,380th largest city in the United States. The population density is 822 per sq mi which is 270% higher than the Illinois average and 807% higher than the national average. The median age in Milan is 44 which is approximately 17% higher than the Illinois average of 37. In Milan, 55% of the population over 15 years of age are married, 95% speak English and 1% speak Spanish. 64% of Milan residents were born in Illinois, 31% were born out of state, 2% were born outside of the United States and 3% were foreign born.