Oglesby is a city located in Illinois. With a 2020 population of 3,529, it is the 392nd largest city in Illinois and the 5757th largest city in the United States . Oglesby is currently declining at a rate of -0.42% annually and its population has decreased by -6.91% since the most recent census, which recorded a population of 3,791 in 2010. Oglesby reached it's highest population of 4,215 in 1960. Spanning over 4 miles, Oglesby has a population density of 869 people per square mile.
The average household income in Oglesby is $67,882 with a poverty rate of 8.23%. The median rental costs in recent years comes to $604 per month, and the median house value is $99,500. The median age in Oglesby is 39.4 years, 39.5 years for males, and 39.4 years for females.