Ottawa is located in Illinois. Ottawa, Illinois has a population of 18,779. Ottawa is less family-centric than the surrounding county with 27.45% of the households containing married families with children. The county average for households married with children is 27.78%.
The median household income in Ottawa, Illinois is $50,250. The median household income for the surrounding county is $54,693 compared to the national median of $57,652. The median age of people living in Ottawa is 38.7 years.
The average high temperature in July is 84.1 degrees, with an average low temperature in January of 15.1 degrees. The average rainfall is approximately 37.3 inches per year, with 20.1 inches of snow per year.
