There are 14 cities in DeKalb County, Illinois.

Download Table Data

Enter your email below, and you'll receive this table's data in your inbox momentarily.

City
Rank
State
2024 Population
2020 Census
Annual Change
Density (mi²)
Area (mi²)
DeKalb1Illinois40,07440,216-0.18%2,48316.14
Sycamore2Illinois18,62818,563-0.06%1,8959.83
Sandwich3Illinois7,0647,210-0.65%1,4924.74
Genoa4Illinois5,4205,3060.56%2,0932.59
Cortland5Illinois4,5034,3970.67%1,2343.65
Hinckley6Illinois1,9531,996-0.76%2,3060.85
Somonauk7Illinois1,7441,787-0.8%7012.49
Kirkland8Illinois1,6011,649-0.93%1,3061.23
Maple Park9Illinois1,5201,4311.2%7342.07
Waterman10Illinois1,4151,433-0.42%9751.45
Malta11Illinois1,1201,141-0.53%1,8300.61
Kingston12Illinois1,0701,106-1.11%1,0870.98
Shabbona13Illinois834860-0.95%6561.27
Lee14Illinois305314-0.97%1,5400.20
showing: 14 rows

Cities in DeKalb County, Illinois by Population (2024)

What is the largest city in DeKalb County, Illinois?

DeKalb is the largest city in DeKalb County.

What is the smallest city in DeKalb County, Illinois?

Lee is the smallest city in DeKalb County.

How many cities are in DeKalb County?

There are 14 cities in DeKalb County, Illinois.

Frequently Asked Questions