
Dekalb
- County:
- DeKalb County
- County Seat:
- No
- Area (mi²):
- 17.33
- State:
- Illinois
DeKalb is a city located in DeKalb County, Illinois. DeKalb has a 2025 population of 40,205. DeKalb is currently declining at a rate of -0.01% annually and its population has decreased by -0.03% since the most recent census, which recorded a population of 40,219 in 2020.
The average household income in DeKalb is $65,561 with a poverty rate of 25.7%. The median age in DeKalb is 25.4 years: 25 years for males, and 26 years for females.