Oglesby is located in La salle county Illinois with a geographic area of 5.0 square miles. The total population in Oglesby is 3,652 with 51.5% male and 48.5% female. Children under age 5 represent 4.2% of the population, under age 18 equal 24.1% of the population and over age 65 is 19.1% of the population. The median household income is $61,250, per capita income is $29,569. There are a total of 1,522 housing units with 79.7% owner occupied. Education includes 35.5% of residents that are high school graduates and 19.7% with a bachelor's degree or higher. The average temperature in Oglesby in the summer is 74 degrees, and in the winter 27 degrees.