Gillespie is a city located in Macoupin County Illinois. Gillespie has a 2020 population of 3,552. Gillespie is currently declining at a rate of -1.09% annually and its population has decreased by -8.62% since the most recent census, which recorded a population of 3,887 in 2010. Gillespie reached it's highest population of 3,887 in 2010.
The average household income in Gillespie is $60,041 with a poverty rate of 19.99%. The median rental costs in recent years comes to $676 per month, and the median house value is $92,300. The median age in Gillespie is 43.1 years, 40 years for males, and 44.8 years for females.