Glen Carbon is a city located in Madison County Illinois. With a 2020 population of 12,766, it is the 189th largest city in Illinois and the 2595th largest city in the United States . Glen Carbon is currently declining at a rate of -0.33% annually and its population has decreased by -1.30% since the most recent census, which recorded a population of 12,934 in 2010. Glen Carbon reached it's highest population of 12,948 in 2017. Spanning over 10 miles, Glen Carbon has a population density of 1,244 people per square mile.
The average household income in Glen Carbon is $110,821 with a poverty rate of 7.98%. The median rental costs in recent years comes to $990 per month, and the median house value is $226,500. The median age in Glen Carbon is 39 years, 36.9 years for males, and 41 years for females.