
Darien
- County:
- DuPage County
- County Seat:
- No
- Area (mi²):
- 6.168
- State:
- Illinois
Darien is a city located in DuPage County, Illinois. Darien has a 2025 population of 21,497. Darien is currently declining at a rate of -0.46% annually and its population has decreased by -2.28% since the most recent census, which recorded a population of 21,999 in 2020.
The average household income in Darien is $133,193 with a poverty rate of 3.83%. The median age in Darien is 44.8 years: 44.7 years for males, and 45.7 years for females.