Aledo, IL has a population of 3,463 and is the 8,094th largest city in the United States. The population density is 1,453 per sq mi which is 553% higher than the Illinois average and 1503% higher than the national average. The median age in Aledo is 45 which is approximately 21% higher than the Illinois average of 37. In Aledo, 60% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 78% of Aledo residents were born in Illinois, 20% were born out of state, 0% were born outside of the United States and 2% were foreign born.