There are 13 zip codes in DeKalb County, Illinois. The most populated is 60115, located in Dekalb. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6011542,456Dekalb
6017821,996Sycamore
6054812,040Sandwich
601357,021Genoa
601124,783Cortland
605524,538Somonauk
605202,927Hinckley
601452,539Kingston
605562,216Waterman
601462,193Kirkland
601502,007Malta
605501,177Shabbona
60111153Clare

Zip Codes in DeKalb County, Illinois by Population (2024)