Ottawa is located in Illinois. Ottawa, Illinois has population of 18,959. Ottawa is less family-centric than the surrounding county with 26% of the households with children.
The median household income in Ottawa, Illinois is $54,244. The median household income for the surrounding county is $59,610 compared to the national median of $66,222. The median age of people living in Ottawa is 41 years.
The average high temperature in July is 84.9 degrees, with an average low temperature in January of 12.2 degrees. The annual precipitation is 35.67.
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