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
City
Population
60115Dekalb42,456
60178Sycamore21,996
60548Sandwich12,040
60135Genoa7,021
60112Cortland4,783
60552Somonauk4,538
60520Hinckley2,927
60145Kingston2,539
60556Waterman2,216
60146Kirkland2,193
60150Malta2,007
60550Shabbona1,177
60111Clare153

DeKalb County, Illinois Zip Codes by Population (2024)