DeKalb is a city located in Illinois. With a 2020 population of 42,603, it is the 35th largest city in Illinois and the 919th largest city in the United States. DeKalb is currently declining at a rate of -0.01% annually and its population has decreased by -2.87% since the most recent census, which recorded a population of 43,862 in 2010. DeKalb reached it's highest population of 44,103 in 2010. Spanning over 16 miles, DeKalb has a population density of 2,640 people per square mile.
The average household income in DeKalb is $60,832 with a poverty rate of 28.73%. The median rental costs in recent years comes to $881 per month, and the median house value is $154,700. The median age in DeKalb is 24.9 years, 25.3 years for males, and 24.5 years for females. For every 100 females there are 95.6 males.