Coal City is a city located in Grundy County Illinois. With a 2020 population of 5,309, it is the 318th largest city in Illinois and the 4607th largest city in the United States . Coal City is currently declining at a rate of -0.93% annually and its population has decreased by -4.98% since the most recent census, which recorded a population of 5,587 in 2010. Coal City reached it's highest population of 5,698 in 2010. Spanning over 6 miles, Coal City has a population density of 949 people per square mile.
The average household income in Coal City is $88,054 with a poverty rate of 7.13%. The median rental costs in recent years comes to $1,006 per month, and the median house value is $197,100. The median age in Coal City is 35.9 years, 34.5 years for males, and 36.8 years for females.