Ottawa is located in La salle county Illinois with a geographic area of 14.7 square miles. The total population in Ottawa is 18,742 with 46.6% male and 53.4% female. Children under age 5 represent 6.4% of the population, under age 18 equal 24.1% of the population and over age 65 is 17.1% of the population. The median household income is $53,544, per capita income is $28,365. There are a total of 7,764 housing units with 65.4% owner occupied. Education includes 30.5% of residents that are high school graduates and 22.4% with a bachelor's degree or higher. The average temperature in Ottawa in the summer is 72 degrees, and in the winter 27 degrees.
