Chester is a city located in Randolph County Illinois. It is also the county seat of Randolph County. With a 2020 population of 8,073, it is the 254th largest city in Illinois and the 3599th largest city in the United States . Chester is currently declining at a rate of -0.86% annually and its population has decreased by -5.97% since the most recent census, which recorded a population of 8,586 in 2010. Chester reached it's highest population of 8,659 in 2013. Spanning over 6 miles, Chester has a population density of 1,390 people per square mile.
The average household income in Chester is $63,071 with a poverty rate of 16.18%. The median rental costs in recent years comes to $535 per month, and the median house value is $101,700. The median age in Chester is 41 years, 39 years for males, and 50.2 years for females.