Aledo is a city located in Mercer County Illinois. It is also the county seat of Mercer County. With a 2020 population of 3,378, it is the 401st largest city in Illinois and the 5876th largest city in the United States . Aledo is currently declining at a rate of -0.79% annually and its population has decreased by -7.20% since the most recent census, which recorded a population of 3,640 in 2010. Aledo reached it's highest population of 3,881 in 1980. Spanning over 2 miles, Aledo has a population density of 1,499 people per square mile.
The average household income in Aledo is $59,021 with a poverty rate of 8.07%. The median rental costs in recent years comes to $621 per month, and the median house value is $97,900. The median age in Aledo is 47.3 years, 46.5 years for males, and 49 years for females.