Gillespie is located in Illinois. Gillespie, Illinois has a population of 3,145. Gillespie is more family-centric than the surrounding county with 27% households with children. The county percentage for households with children is 26%.
The median household income in Gillespie, Illinois is $43,881. The median household income for the surrounding county is $56,452 compared to the national median of $66,222. The median age of people living in Gillespie is 40 years.
The average high temperature in July is 87.3 degrees, with an average low temperature in January of 17.4 degrees. The annual precipitation is 38.73.