Darien is a city located in Illinois. With a 2020 population of 21,304, it is the 114th largest city in Illinois and the 1763rd largest city in the United States . Darien is currently declining at a rate of -0.75% annually and its population has decreased by -3.54% since the most recent census, which recorded a population of 22,086 in 2010. Darien reached it's highest population of 22,860 in 2000. Spanning over 6 miles, Darien has a population density of 3,434 people per square mile.
The average household income in Darien is $122,374 with a poverty rate of 5.12%. The median rental costs in recent years comes to $1,201 per month, and the median house value is $330,000. The median age in Darien is 46.4 years, 44.5 years for males, and 48.6 years for females.