Zion is a city located in Lake County, Illinois. With a 2020 population of 23,419, it is the 100th largest city in Illinois and the 1637th largest city in the United States. Zion is currently declining at a rate of -0.61% annually and its population has decreased by -4.07% since the most recent census, which recorded a population of 24,413 in 2010. Zion reached it's highest population of 24,421 in 2010. Spanning over 10 miles, Zion has a population density of 2,392 people per square mile.
The average household income in Zion is $61,282 with a poverty rate of 19.47%. The median rental costs in recent years comes to $1,002 per month, and the median house value is $117,600. The median age in Zion is 32.3 years, 31 years for males, and 33.5 years for females. For every 100 females there are 88.0 males.