Waterloo is located in Illinois. Waterloo, Illinois has a population of 10,417. Waterloo is less family-centric than the surrounding county with 30% households with children. The county percentage for households with children is 32%.
The median household income in Waterloo, Illinois is $69,689. The median household income for the surrounding county is $85,717 compared to the national median of $66,222. The median age of people living in Waterloo is 42 years.
The average high temperature in July is 88.5 degrees, with an average low temperature in January of 20.3 degrees. The annual precipitation is 42.11.