Jacksonville is located in Illinois. Jacksonville, Illinois has a population of 18,446. Jacksonville is less family-centric than the surrounding county with 23% households with children. The county percentage for households with children is 25%.
The median household income in Jacksonville, Illinois is $44,862. The median household income for the surrounding county is $52,743 compared to the national median of $66,222. The median age of people living in Jacksonville is 37.7 years.
The average high temperature in July is 87 degrees, with an average low temperature in January of 15 degrees. The annual precipitation is 38.47.