Dayton is located in Illinois. Dayton, Illinois has a population of 9,389.
The median household income in Dayton, 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 Dayton 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.